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Enzyme Nomenclature
Information on EC 1.1.1.39 - malate dehydrogenase (decarboxylating)
for references in articles please use BRENDA:EC1.1.1.39
Word Map on EC 1.1.1.39
- 1.1.1.39
-
decarboxylate
- nadp+
-
nadp+-dependent
- fumarate
- l-malate
- alpha-glycerophosphate
- hydrogenosomes
-
anaplerotic
-
alpha-gpd
-
nad+-malic
- friedreich
- synthesis
- medicine
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The expected taxonomic range for this enzyme is: Eukaryota, Bacteria
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EC NUMBER 
COMMENTARY 
1.1.1.39
-
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RECOMMENDED NAME
GeneOntology No.
malate dehydrogenase (decarboxylating)
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT
LITERATURE
(S)-malate + NAD+ = pyruvate + CO2 + NADH
sequential mechanism, each of the substrate pairs binds randomly to the enzyme
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
slow reaction transient in the form of a lag before reaching a steady-state rate in assay
Crassula argentea
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
rapid equilibrium reaction of the intersecting type
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
sequential mechanism with each substrate bound randomly
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
-
-
-
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
reaction mechanism of oxidative decarboxylation
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
active site structure, catalytic residues are Y126, R181, K199, D295, N343, and N479
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
reaction mechanism, active site structure, enzyme-cofactor interactions, overview
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
catalytic mechanism, malate is bound deeply in the active site, Mn2+ catalyzes the entire reaction, Lys183 is the general base for oxidation, Tyr112-Lys183 functions as the general acid-base pair to catalyze the tautomerization of the enolpyruvate product from decarboxylation to pyruvate, substrate and cofacor binding modes
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
acid-base chemical mechanism for Ascaris suum malic enzyme
-
(S)-malate + NAD+ = pyruvate + CO2 + NADH
isozyme NAD-ME2 and chimeric mutant NAD-ME1q follow a sequential ordered Bi-Ter mechanism, NAD+ being the leading substrate followed by (S)-malate. Hetereodimer NAD-MEH can bind both substrates randomly. Interaction between NAD-ME1 and -ME2 generates a heteromeric isozyme NAD-MEH with a particular kinetic behaviour; isozyme NAD-ME2 and chimeric mutant NAD-ME1q follow a sequential ordered Bi-Ter mechanism, NAD+ being the leading substrate followed by (S)-malate. Isozyme NAD-ME1 and hetereodimer NAD-MEH can bind both substrates randomly. However, NAD-ME1 shows a preferred route that involves the addition of NAD+ first. interaction between NAD-ME1 and -ME2 generates a heteromeric isozyme NAD-MEH with a particular kinetic behaviour
-
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
oxidation
-
-
-
-
oxidative decarboxylation
-
-
-
-
redox reaction
-
-
-
-
reduction
-
-
-
-
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PATHWAY
BRENDA Link
KEGG Link
MetaCyc Link
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SYSTEMATIC NAME
IUBMB Comments
(S)-malate:NAD+ oxidoreductase (decarboxylating)
Does not decarboxylate added oxaloacetate.
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CAS REGISTRY NUMBER
COMMENTARY
9028-46-0
-
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ORGANISM
COMMENTARY
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
isozyme NAD-ME1; isozyme NAD-ME1 encoded by gene AtNAD-ME1
UniProt
isozyme NAD-ME2; isozyme NAD-ME2 encoded by gene AtNAD-ME2
UniProt
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GENERAL INFORMATION
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
malfunction
metabolism
physiological function
additional information
malfunction
dme mutants of the broad-host-range Sinorhizobium sp. strain NGR234 form nodules whose level of N2 fixation vary from 27 to 83% (plant dry weight) of the wild-type level, depending on the host plant inoculated. The single dme mutant fixes N2 at reduced rate. A pckA dme double mutant has no N2-fixing activity, PCK is phosphoenolpyruvate carboxykinase. Symbiotic phenotypes of NGR234 and NGR234 dme mutants on different host plants, overview
malfunction
-
the single Sco2951 and the double Sco2951 Sco5261 mutants, deficient in ME-NAD and ME-NADP, EC 1.1.1.40, activity, display a strong reduction in the production of the polyketide antibiotic actinorhodin. Additionally, the Sco2951/Sco5261 mutant shows a decrease in stored triacylglycerides during exponential growth
malfunction
-
knockdown of ME1 does not inhibit insulin release stimulated by glucose, pyruvate or 2-aminobicyclo [2,2,1]heptane-2-carboxylic acid-plus-glutamine
malfunction
-
dme mutants of the broad-host-range Sinorhizobium sp. strain NGR234 form nodules whose level of N2 fixation vary from 27 to 83% (plant dry weight) of the wild-type level, depending on the host plant inoculated. The single dme mutant fixes N2 at reduced rate. A pckA dme double mutant has no N2-fixing activity, PCK is phosphoenolpyruvate carboxykinase. Symbiotic phenotypes of NGR234 and NGR234 dme mutants on different host plants, overview
-
malfunction
-
the single Sco2951 and the double Sco2951 Sco5261 mutants, deficient in ME-NAD and ME-NADP, EC 1.1.1.40, activity, display a strong reduction in the production of the polyketide antibiotic actinorhodin. Additionally, the Sco2951/Sco5261 mutant shows a decrease in stored triacylglycerides during exponential growth
-
metabolism
-
the malic enzyme is involved in the (S)-malate catabolic pathways and the putative gluconeogenic pathways, overview
metabolism
-
the citrate-malate-pyruvate cycle serves to regenerate NAD+ and maintain glycolytic flux. Pyruvate cycles all lead to the exchange of reducing equivalents from mitochondrial NADH to cytosolic NADPH. Malic enzyme is integral to the coupling of metabolism with insulin secretion
metabolism
-
fish spermatozoa contain a glycolytic pathway, tricarboxylic acid cycle and oxidative phosphorylation system, all of which are key pathways contributing to ATP synthesis, involving the enzyme
metabolism
-
fish spermatozoa contain a glycolytic pathway, tricarboxylic acid cycle and oxidative phosphorylation system, all of which are key pathways contributing to ATP synthesis, involving the enzyme
metabolism
-
fish spermatozoa contain a glycolytic pathway, tricarboxylic acid cycle and oxidative phosphorylation system, all of which are key pathways contributing to ATP synthesis, involving the enzyme
metabolism
-
fish spermatozoa contain a glycolytic pathway, tricarboxylic acid cycle and oxidative phosphorylation system, all of which are key pathways contributing to ATP synthesis, involving the enzyme
metabolism
-
fish spermatozoa contain a glycolytic pathway, tricarboxylic acid cycle and oxidative phosphorylation system, all of which are key pathways contributing to ATP synthesis, involving the enzyme
metabolism
-
the malic enzyme is involved in the (S)-malate catabolic pathways and the putative gluconeogenic pathways, overview
-
physiological function
-
the malic enzyme pathway enables Lactobacillus casei to grow on L-malic acid., requirement of the MaeKR two-component system for L-malic acid utilization via a malic enzyme pathway, overview
physiological function
-
for a metabolic condition in which the mitochondrial NAD level is low and the (S)-malate level is high, the activity of homodimeric isozyme NAD-ME2 and/or heterodimer NAD-MEH would be preferred over that of homodimeric isozyme NAD-ME1; for a metabolic condition in which the mitochondrial NAD level is low and the (S)-malate level is high, the activity of homodimeric isozyme NAD-ME2 and/or heterodimer NAD-MEH would be preferred over that of homodimeric isozyme NAD-ME1
physiological function
malic enzyme plays an important role in the metabolic regulation under photoheterotrophic conditions, carbon metabolic pathway, overview
physiological function
-
siRNA knockdown and isotopic labeling strategies to evaluate the role of cytosolic and mitochondrial isozymes of malic enzyme in facilitating malate-pyruvate cycling in the context of fuel-stimulated insulin secretion, overview
physiological function
-
DME is considered an important enzyme for regulating C4-dicarboxylic acid metabolism in N2-fixing bacteroids because its activity is strongly inhibited by acetyl-CoA and stimulated by fumarate and succinate. The NAD+-malic enzyme is required for N2 fixation, and this activity is thought to be required for the anaplerotic synthesis of pyruvate
physiological function
AZC3656 protein is a NAD+-malic enzyme, i.e. DME, while AZC0119 protein is not a malic enzyme. DME is considered an important enzyme for regulating C4-dicarboxylic acid metabolism in N2-fixing bacteroids because its activity is strongly inhibited by acetyl-CoA and stimulated by fumarate and succinate. The NAD+-malic enzyme is required for N2 fixation, and this activity is thought to be required for the anaplerotic synthesis of pyruvate. But NGR234 bacteroids appear to synthesize pyruvate from TCA cycle intermediates via DME or PCK, phosphoenolpyruvate carboxykinase, pathways, overview
physiological function
-
the enzyme plays a role in antibiotic and triacylglycerol production, e.g. production of the polyketide antibiotic actinorhodin, overview
physiological function
-
role of malic enzyme activity regulation in mitochondria of herring sperm cells. The enzyme NAD-ME shows cooperation with phosphocreatine shuttle for cellular energy homeostasis in herring spermatozoa
physiological function
plant mitochondria can use L-malate and fumarate, which accumulate in large levels, as respiratory substrates. In part, this property is due to the presence of NAD-dependent malic enzymes (NAD-ME). Malic enzyme tracers reveal hypoxia-induced switch in adipocyte NADPH pathway usage; Plant mitochondria can use L-malate and fumarate, which accumulate in large levels, as respiratory substrates. In part, this property is due to the presence of NAD-dependent malic enzymes (NAD-ME). Malic enzyme tracers reveal hypoxia-induced switch in adipocyte NADPH pathway usage. Important role of NAD-ME1 in processes that control flow of C4 organic acids in Arabidopsis mitochondrial metabolism.. NAD-ME1 exhibits a complex homo and heterotrophic allosteric regulation with L-malate wielding an inhibitory effect that is cancelled by competitive fumarate binding
physiological function
-
the malic enzyme pathway enables Lactobacillus casei to grow on L-malic acid., requirement of the MaeKR two-component system for L-malic acid utilization via a malic enzyme pathway, overview
-
physiological function
-
malic enzyme plays an important role in the metabolic regulation under photoheterotrophic conditions, carbon metabolic pathway, overview
-
physiological function
-
AZC3656 protein is a NAD+-malic enzyme, i.e. DME, while AZC0119 protein is not a malic enzyme. DME is considered an important enzyme for regulating C4-dicarboxylic acid metabolism in N2-fixing bacteroids because its activity is strongly inhibited by acetyl-CoA and stimulated by fumarate and succinate. The NAD+-malic enzyme is required for N2 fixation, and this activity is thought to be required for the anaplerotic synthesis of pyruvate. But NGR234 bacteroids appear to synthesize pyruvate from TCA cycle intermediates via DME or PCK, phosphoenolpyruvate carboxykinase, pathways, overview
-
physiological function
-
the enzyme plays a role in antibiotic and triacylglycerol production, e.g. production of the polyketide antibiotic actinorhodin, overview
-
additional information
-
deletion of either the gene encoding the histidine kinase or the response regulator of the TC system results in the loss of the ability to grow on L-malic acid, thus indicating that the cognate TC system regulates and is essential for the expression of malic enzyme. Expression of maeE is induced in the presence of L-malic acid and repressed by glucose, whereas TC system expression is induced by L-malic acid and is not repressed by glucose
additional information
-
interaction between NAD-ME1 and -ME2 generates a heteromeric enzyme NAD-MEH with a particular kinetic behaviour. The N-terminal region of NAD-ME1 and -ME2 is associated with the order of substrate binding. The chimeric enzyme NAD-ME1q, that is composed of the first 176 amino acid residues of NAD-ME2 and the central and C-terminal sequence of NAD-ME1, shows a hyperbolic behaviour for (S)-malate and NAD+. Product-inhibition pattern of NAD-ME1q with the three products supports a sequential ordered mechanism; interaction between NAD-ME1 and -ME2 generates a heteromeric enzyme NAD-MEH with a particular kinetic behaviour. The N-terminal region of NAD-ME1 and -ME2 is associated with the order of substrate binding. The chimeric enzyme NAD-ME1q, that is composed of the first 176 amino acid residues of NAD-ME2 and the central and C-terminal sequence of NAD-ME1, shows a hyperbolic behaviour for (S)-malate and NAD+. Product-inhibition pattern of NAD-ME1q with the three products supports a sequential ordered mechanism
additional information
enzyme activity is allosterically regulated by acetyl-CoA
additional information
-
identification of specific domains of the primary structure, which are involved in the differential allosteric regulation. Different properties of NAD-ME1, -2, and -H, mitochondrial NAD-ME activity may be regulated by varying native association in vivo, rendering enzymatic entities with distinct allosteric regulation to fulfill specific roles, overview; identification of specific domains of the primary structure, which are involved in the differential allosteric regulation. Different properties of NAD-ME1, -2, and -H, mitochondrial NAD-ME activity may be regulated by varying native association in vivo, rendering enzymatic entities with distinct allosteric regulation to fulfill specific roles, overview; identification of specific domains of the primary structure, which are involved in the differential allosteric regulation. Different properties of NAD-ME1, -2, and -H, mitochondrial NAD-ME activity may be regulated by varying native association in vivo, rendering enzymatic entities with distinct allosteric regulation to fulfill specific roles, overview
additional information
-
higher expression of ME2 correlates with the degree of cell de-differentiation. Knockdown of ME2 leads to induction of erythroid differentiation, and diminished proliferation of tumor cells and increased apoptosis in vitro. ME2 knockdown also totally abolishes growth of K562 cells in nude mice. Depletion of endogenous ME2 levels enhances reactive oxygen species, increases NAD+/NADH and NADP+/NADPH ratio and inhibits ATP production in K562 cells. ME2 depletion resulted in high orotate levels, suggesting potential impairment of pyrimidine metabolism
additional information
mutants and chimeric proteins of NAD-ME1 and -2 indicated that the amino-terminal region of NAD-ME1 is implicated in fumarate activation and sigmoidal L-malate responses, structure-function analysis, overview; residues Arg50, Arg80 and Arg84 show different roles in organic acid binding. These residues form a triad, which is the basis of the homo and heterotrophic effects that characterize NAD-ME1. Mutants and chimeric proteins of NAD-ME1 and -2 indicated that the amino-terminal region of NAD-ME1 is implicated in fumarate activation and sigmoidal L-malate responses, structure-function analysis, overview
additional information
mutants and chimeric proteins of NAD-ME1 and -2 indicated that the amino-terminal region of NAD-ME1 is implicated in fumarate activation and sigmoidal L-malate responses, structure-function analysis, overview; residues Arg50, Arg80 and Arg84 show different roles in organic acid binding. These residues form a triad, which is the basis of the homo and heterotrophic effects that characterize NAD-ME1. Mutants and chimeric proteins of NAD-ME1 and -2 indicated that the amino-terminal region of NAD-ME1 is implicated in fumarate activation and sigmoidal L-malate responses, structure-function analysis, overview
additional information
-
deletion of either the gene encoding the histidine kinase or the response regulator of the TC system results in the loss of the ability to grow on L-malic acid, thus indicating that the cognate TC system regulates and is essential for the expression of malic enzyme. Expression of maeE is induced in the presence of L-malic acid and repressed by glucose, whereas TC system expression is induced by L-malic acid and is not repressed by glucose
-
additional information
-
enzyme activity is allosterically regulated by acetyl-CoA
-
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SUBSTRATE
PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
(S)-malate + NAD+
?
-
the enzyme plays a special role in the decarboxylation of C4 acids to pyruvate and CO2, which are used in subsequent photosynthesis. pH, NAD+, and coenzyme A levels in the matrix act together to regulate (S)-malate oxidation
-
-
?
(S)-malate + NAD+
?
-
the enzyme plays a special role in the decarboxylation of C4 acids to pyruvate and CO2, which are used in subsequent photosynthesis. pH, NAD+, and coenzyme A levels in the matrix act together to regulate (S)-malate oxidation
-
-
?
(S)-malate + NAD+
pyruvate + CO2 + NADH
the enzyme plays a central role in the metabolite flux through the tricarboxylic acid cycle, overview
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
the mitochondrial NAD-malic enzyme catalyzes the oxidative decarboxylation of malate to pyruvate and CO2
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
the NAD-malic enzyme catalyzes the oxidative decarboxylation of (S)-malate via oxaloacetate, Arg181 is within hydrogen bonding distance of the 1-carboxylate of malate in the active site of the enzyme and interacts with the carboxamide side chain of the nicotinamide ring of NADH, but not with NAD+
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
the decarboxylation reaction is preferred, overview
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
enzyme is involved in carbon fixation and metabolism, regulation of the pathways, overview
-
-
?
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
mitochondrial isozyme ME2 responds to elevated amino acids and serves to supply sufficient pyruvate for increased Krebs cycle flux when glucose is limiting
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
the enzyme plays a role in symbiotic N2 fixation, overview
-
-
r
(S)-malate + NAD+
pyruvate + NADH + H+ + CO2
NAD-ME1, -ME2 and -MEH catalyse the reverse reaction of pyruvate reductive carboxylation with very low catalytic activity, supporting the notion that these isoforms act only in (S)-malate oxidation in plant mitochondria
-
-
r
(S)-malate + NAD+
pyruvate + NADH + H+ + CO2
NAD-ME1, -ME2 and -MEH catalyse the reverse reaction of pyruvate reductive carboxylation with very low catalytic activity, supporting the notion that these isoforms act only in (S)-malate oxidation in plant mitochondria
-
-
ir
(S)-malate + NAD+
pyruvate + NADH + H+ + CO2
-
very low activity in the reverse reaction in vitro
-
-
r
(S)-malate + NADP+
pyruvate + CO2 + NADPH
-
15% of the activity with NAD+
-
?
(S)-malate + NADP+
pyruvate + CO2 + NADPH
Crassula argentea
-
14% of the activity with NAD+
-
?
(S)-malate + NADP+
pyruvate + CO2 + NADPH
-
at 1.5% of the activity with NAD+
-
?
(S)-malate + NADP+
pyruvate + NADPH + H+ + CO2
NADP+ shows 22% of the activity with NAD+
-
-
?
(S)-malate + NADP+
pyruvate + NADPH + H+ + CO2
NADP+ shows 22% of the activity with NAD+
-
-
?
malate + NAD+
pyruvate + CO2 + NADH
-
ionized malic acid is the true substrate
-
?
malate + NAD+
pyruvate + CO2 + NADH
-
no decarboxylation of malate in absence of either Mg2+ or NAD+
-
?
malate + NAD+
pyruvate + CO2 + NADH
Crassula argentea
-
activity of the reverse reaction is 1.5% of that of the forward reaction
-
r
pyruvate + CO2 + NADH
(S)-malate + NAD+
-
the rate of carboxylation of pyruvate to malate is lower than for the decarboxylation reaction
-
-
r
pyruvate + CO2 + NADH
(S)-malate + NAD+
Crassula argentea
-
activity is 1.5% of the decarboxylation of (S)-malate
-
r
pyruvate + NAD+ + HCO3-
(S)-malate + NADH
-
method optimization of the reverse reaction of the malic enzyme for HCO3- fixation into pyruvic acid to produce L-malic acid with NADH generation including the activity of glucose-6-phosphate dehydrogenase, EC 1.1.1.49, from Leuconostoc mesenteroides
-
-
?
pyruvate + NAD+ + HCO3-
(S)-malate + NADH
-
method optimization of the reverse reaction of the malic enzyme for HCO3- fixation into pyruvic acid to produce L-malic acid with NADH generation including the activity of glucose-6-phosphate dehydrogenase, EC 1.1.1.49, from Leuconostoc mesenteroides
-
-
?
additional information
?
-
-
NAD-ME1 does not perform decarboxylation of oxaloacetate
-
-
-
additional information
?
-
-
NAD-ME2 does not perform decarboxylation of oxaloacetate
-
-
-
additional information
?
-
-
NAD-MEH does not perform decarboxylation of oxaloacetate
-
-
-
additional information
?
-
NAD-ME1 has a regulatory site for L-malate that can also bind fumarate
-
-
-
additional information
?
-
NAD-ME1 has a regulatory site for L-malate that can also bind fumarate
-
-
-
additional information
?
-
NAD-ME1 has a regulatory site for L-malate that can also bind fumarate. L-Malate binding to this site elicits a sigmoidal and low substrate-affinity response, whereas fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme. This effect is also observed when the allosteric site is either removed or altered. Fumarate is not really an activator, but suppresses the inhibitory effect of L-malate. Residues Arg50, Arg80 and Arg84 show different roles in organic acid binding. These residues form a triad, which is the basis of the homo and heterotrophic effects that characterize NAD-ME1
-
-
-
additional information
?
-
NAD-ME1 has a regulatory site for L-malate that can also bind fumarate. L-Malate binding to this site elicits a sigmoidal and low substrate-affinity response, whereas fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme. This effect is also observed when the allosteric site is either removed or altered. Fumarate is not really an activator, but suppresses the inhibitory effect of L-malate. Residues Arg50, Arg80 and Arg84 show different roles in organic acid binding. These residues form a triad, which is the basis of the homo and heterotrophic effects that characterize NAD-ME1
-
-
-
additional information
?
-
-
the Ascaris suum enzyme forms complexes with the structurally similar human enzyme
-
-
-
additional information
?
-
-
enzyme shows a strict requirement for 2S-stereochemistry
-
-
-
additional information
?
-
-
the malic enzyme catalyzes the reversible oxidative decarboxylation of L-malate to pyruvate and CO2 with simultaneous reduction in NAD+ to NADH
-
-
-
additional information
?
-
Mnium undulatum
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
the enzyme shows 1% of the forward reaction activity in the reverse reaction and in decarboxylation oxaloacetate. D-malate and succinate are poor substrates showing 3.9% and 8.2% of the activity with (S)-malate
-
-
-
additional information
?
-
the enzyme shows 1% of the forward reaction activity in the reverse reaction and in decarboxylation oxaloacetate. D-malate and succinate are poor substrates showing 3.9% and 8.2% of the activity with (S)-malate
-
-
-
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NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate)
(Substrate)
LITERATURE
(Substrate)
(Substrate)
COMMENTARY
(Product)
(Product)
LITERATURE
(Product)
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
r=reversible
ir=irreversible
?=not specified
(S)-malate + NAD+
?
-
the enzyme plays a special role in the decarboxylation of C4 acids to pyruvate and CO2, which are used in subsequent photosynthesis. pH, NAD+, and coenzyme A levels in the matrix act together to regulate (S)-malate oxidation
-
-
?
(S)-malate + NAD+
?
-
the enzyme plays a special role in the decarboxylation of C4 acids to pyruvate and CO2, which are used in subsequent photosynthesis. pH, NAD+, and coenzyme A levels in the matrix act together to regulate (S)-malate oxidation
-
-
?
(S)-malate + NAD+
pyruvate + CO2 + NADH
Q8L7K9, Q9SIU0
the enzyme plays a central role in the metabolite flux through the tricarboxylic acid cycle, overview
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
enzyme is involved in carbon fixation and metabolism, regulation of the pathways, overview
-
-
?
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
mitochondrial isozyme ME2 responds to elevated amino acids and serves to supply sufficient pyruvate for increased Krebs cycle flux when glucose is limiting
-
-
r
(S)-malate + NAD+
pyruvate + CO2 + NADH
-
the enzyme plays a role in symbiotic N2 fixation, overview
-
-
r
(S)-malate + NAD+
pyruvate + NADH + H+ + CO2
Q8L7K9, Q9T0H6
NAD-ME1, -ME2 and -MEH catalyse the reverse reaction of pyruvate reductive carboxylation with very low catalytic activity, supporting the notion that these isoforms act only in (S)-malate oxidation in plant mitochondria
-
-
r
(S)-malate + NAD+
pyruvate + NADH + H+ + CO2
Q8L7K9, Q9T0H6
NAD-ME1, -ME2 and -MEH catalyse the reverse reaction of pyruvate reductive carboxylation with very low catalytic activity, supporting the notion that these isoforms act only in (S)-malate oxidation in plant mitochondria
-
-
ir
(S)-malate + NADP+
pyruvate + NADPH + H+ + CO2
A4F2S6
NADP+ shows 22% of the activity with NAD+
-
-
?
(S)-malate + NADP+
pyruvate + NADPH + H+ + CO2
A4F2S6
NADP+ shows 22% of the activity with NAD+
-
-
?
additional information
?
-
-
the Ascaris suum enzyme forms complexes with the structurally similar human enzyme
-
-
-
additional information
?
-
Mnium undulatum
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
additional information
?
-
-
comparison of enzyme activity in different species under different conditions, significant differences in the accumulation of malate between day and night, overview
-
-
-
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COFACTOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
NAD+
-
His362 is involved in NAD+-specific catalysis of NAD-ME, and residue 314 may interact with the bisphosphate of the NAD+ moiety, structure analysis, overview
additional information
-
Arg181 is within hydrogen bonding distance of the 1-carboxylate of malate in the active site of the enzyme and interacts with the carboxamide side chain of the nicotinamide ring of NADH, but not with NAD+
-
additional information
the enzyme uses both NAD+ and NADP+
-
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METALS and IONS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
Co2+
Mg2+
Mn2+
NH4+
Ni2+
-
divalent metal ion required, NADP+-linked activity exhibits a maximum at 5 mM Ni2+
Zn2+
5fold activation at 5 mM, only slight activation at 10 mM
additional information
Mg2+
a divalent metal ion, Mn+2 or Mg+2+, is essential for the enzyme reaction; a divalent metal ion, Mn+2 or Mg+2+, is essential for the enzyme reaction
Mg2+
-
strict requirement for a divalent cation, maximal activation at 2 mM
Mg2+
-
no decarboxylation of malate in absence of either Mg2+ or NAD+. Km: 0.04 mM
Mg2+
-
divalent metal ion required, NAD+-linked activity shows maximal activity at 5 mM Mg2+
Mg2+
-
Km with NAD+: 4.25 mM, Km with NADP+: 13.3 mM; Mn2+ or Mg2+ required
Mg2+
-
activation by Mn2+, at 1 mM, is 10% and 20% higher than activation with 1 mM Mg2+ in the presence of NAD+ and NADP+; completely dependent on the presence of Mg2+ or Mn2+
Mn2+
-
activates the enzyme in mitochondria, kinetics, overview
Mn2+
a divalent metal ion, Mn+2 or Mg+2+, is essential for the enzyme reaction; a divalent metal ion, Mn+2 or Mg+2+, is essential for the enzyme reaction
Mn2+
-
strict requirement for a divalent cation, maximal activation at 5 mM
Mn2+
-
activates, Km 0.08 mM in the decarboxylation/oxidation reaction; activates, Km is 0.08 mM
Mn2+
-
reversible structural interconversion to the Lu3+-binding form, metal binding site structure
Mn2+
-
during the catalytic process of malic enzyme, binding of metal ion induces a conformational change within the enzyme from the open form to an intermediate form, which upon binding of L-malate, transforms further into a catalytically competent closed form
Mn2+
-
Km with NAD+: 0.14 mM, Km with NADP+: 0.81 mM; Mn2+ or Mg2+ required
NH4+
-
partially rescues the activity of the R181Q mutant by binding in the pocket vacated by the guanidinium group of R181, 2 mol of ammonia bind per mole of active sites, high-affinity Km is 0.7 mM, low-affinity Km is 420 mM
additional information
-
presence of divalent cations is essential for activation of the enzyme
additional information
malic enzyme activity is markedly enhanced by mono- and divalent cations
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INHIBITORS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
5'-AMP
-
isozyme NAD-ME2, competitive versus NAD+, mixed inhibition versus (S)-malate
CO2
-
chimeric mutant NAD-ME1q, mixed inhibition versus NAD+ and (S)-malate; isozyme NAD-ME2 and chimeric mutant NAD-ME1q, mixed inhibition versus NAD+ and (S)-malate
fructose 6-phosphate
competitive versus (S)-malate, 70% inhibition at 2.5 mM
L-aspartate
-
slightly competitive to malate, only slight inhibition below pH 6.0
Lu3+
-
strong inhibition, reversible slow-binding mechanism, reversible structural interconversion to the Mn2+-binding form, metal binding site structure
Mn2+
-
inhibits the reductive carboxylation reaction, inhibitory effect is about 20fold reduced by binding of fumarate and L-malate
Urea
-
denaturation, in 3-5 M urea, the enzyme undergoes a reversible tetramer-dimer-monomer quaternary structural change in an acidic pH environment, which resulted in a molten globule state that is prone to aggregate, Mn2+ protects, overview
acetyl-CoA
enzyme activity is allosterically regulated by acetyl-CoA, almost complete inhibition at 0.05 mM
ATP
-
the enzyme is competitively inhibited by ATP up to 10fold. Addition of 1 mM or 5 mM fumarate reverses ATP-dependent inhibition of the enzyme to 55 or 70% of its maximum activity, respectively
ATP
-
NAD-ME is competitively inhibited versus L-malate by ATP, 90% inhibiiton at 2.0 mM
NADH
-
isozyme NAD-ME2, competitive versus NAD+, mixed inhibition versus (S)-malate. NADH shows competitive and mixed-type inhibition versus NAD+ and (S)-malate with chimeric mutant NAD-ME1q; NADH shows competitive and mixed-type inhibition versus NAD+ and (S)-malate with chimeric mutant NAD-ME1q
oxaloacetate
competitive versus (S)-malate, 20% inhibition at 2.5 mM
phosphoenolpyruvate
Crassula argentea
-
activates at low concentrations, deactivation at high concentrations
pyruvate
-
isozyme NAD-ME2, uncompetitive versus NAD+, mixed inhibition versus (S)-malate. Pyruvate inhibition is uncompetitive with respect to NAD+ and mixed with respect to (S)-malate for the chimeric mutant NAD-ME1q; pyruvate inhibition is uncompetitive with respect to NAD+ and mixed with respect to (S)-malate for the chimeric mutant NAD-ME1q
Tartrate
-
substrate analogue, isozyme NAD-ME2, uncompetitive versus NAD+, competitive versus (S)-malate
additional information
-
product inhibition patterns of isozyme NAD-ME2, overview; product inhibition patterns of isozyme NAD-ME2, overview
-
additional information
Mnium undulatum
-
keeping plants in CO2-free air suppresses the activities of NAD-ME
-
additional information
-
keeping plants in CO2-free air suppresses the activities of NAD-ME
-
additional information
-
keeping plants in CO2-free air suppresses the activities of NAD-ME
-
additional information
-
keeping plants in CO2-free air suppresses the activities of NAD-ME
-
additional information
-
water stress reduces the enzyme activity in vivo
-
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ACTIVATING COMPOUND
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
additional information
-
no activation by CoA and acetyl-CoA, poor activation by ATP and AMP; no activation by oxaloacetate, poor activation by ATP and AMP; poor activation by ATP and AMP
-
coenzyme A
-
serves to broaden the pH-optimum, at pH 7.5 approximately 4fold stimulation, the effect is more marked when HCO3 is also present, below pH 7 no effect on activity
coenzyme A
-
serves to broaden the pH-optimum, at pH 7.5 approximately 4fold stimulation, the effect is more marked when HCO3 is also present, below pH 7 no effect on activity
fumarate
Arabidopsis NAD-ME1 is strongly stimulated by fumarate. Fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme. This effect is also observed when the allosteric site is either removed or altered. Hence, fumarate is not really an activator, but suppresses the inhibitory effect of L-malate. Binding of L-malate and fumarate at the same allosteric site; Arabidopsis NAD-ME1 is strongly stimulated by fumarate. Fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme. This effect is also observed when the allosteric site is either removed or altered. Hence, fumarate is not really an activator, but suppresses the inhibitory effect of L-malate. Binding of L-malate and fumarate at the same allosteric site. Arg84 is essential for fumarate activation
fumarate
-
activates in both reaction directions synergistically with L-malate both binding at separate allosteric sites different from the active site, R105 and K143 are involved
L-malate
-
activates in both reaction directions synergistically with fumarate both binding at separate allosteric sites different from the active site, R105 and K143 are involved
phosphoenolpyruvate
Crassula argentea
-
activates at low concentrations, decativation at high concentrations
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KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.64
(S)-malate
pH 7.8, 30°C, AZC3656, in presence of 10 mM succinate
2 - 3
(S)-malate
-
pH 8.5, 25°C, recombinant mutant R181Q in presence of 60 mM guanidinium
2.6
(S)-malate
-
isozyme NAD-ME2, pH 6.5, temperature not specified in the publication
2.7
(S)-malate
-
pH 6.5, temperature not specified in the publication, NAD-MEH
3
(S)-malate
pH 7.4, 30°C, isozyme NAD-ME1; pH 7.4, 30°C, isozyme NAD-ME2
3
(S)-malate
-
pH 6.4, temperature not specified in the publication, NAD-ME1; pH 6.6, temperature not specified in the publication, NAD-ME2
8
(S)-malate
-
pH 8.5, 25°C, recombinant mutant R181Q, in presence of 60 mM NH4+
27.6
(S)-malate
pH 7.8, 30°C, AZC3656, in presence of 0.05 mM acetyl-CoA
0.5
NAD+
pH 7.4, 30°C, isozyme NAD-ME1; pH 7.4, 30°C, isozyme NAD-ME2
0.5
NAD+
-
pH 6.4, temperature not specified in the publication, NAD-ME1; pH 6.6, temperature not specified in the publication, NAD-ME2
0.55
NAD+
-
pH 6.5, temperature not specified in the publication, NAD-MEH
1.1
NAD+
-
isozyme NAD-ME2, pH 6.5, temperature not specified in the publication
additional information
additional information
-
detailed kinetic mechanism study, steady-state kinetics
-
additional information
additional information
-
kinetics of wild-type and mutant enzymes, primary deuterium and 13C isotope effects of mutant R181Q in the absence and presence of ammonium ions, overview
-
additional information
additional information
-
primary deuterium and 13C kinetic isotope effects, kinetics, and kinetic mechanism of wild-type and mutant enzymes, overview
-
additional information
additional information
-
kinetic mechanisms of homodimers NAD-ME1 and NAD-ME2, and of NAD-ME heterodimer NAD-MEH, overview. The first 176 amino acids are associated with the differences observed in the kinetic mechanisms of the enzymes. Activity of NAD-ME1 in the direction of malate decarboxylation shows a hyperbolic response, proposed kinetic model for NAD-ME1. Isozyme NAD-ME2 follows a sequential ordered Bi-Ter mechanism. Kinetic properties and mechanism of chimeric mutant NAD-ME1q, overview; kinetic mechanisms of homodimers NAD-ME1 and NAD-ME2, and of NAD-ME heterodimer NAD-MEH, overview. The first 176 amino acids are associated with the differences observed in the kinetic mechanisms of the enzymes. Activity of NAD-ME1 in the direction of malate decarboxylation shows a hyperbolic response, proposed kinetic model for NAD-ME1. Kinetic properties and mechanism of chimeric mutant NAD-ME1q, overview
-
additional information
additional information
steady-state kinetics, overview
-
additional information
additional information
-
kinetic analysis and comparison of the different isozymes MAD-ME1, NAD-ME2, and NAD-MEH, and of mutants NADME1q and NAD-ME2q, overview; kinetic analysis and comparison of the different isozymes MAD-ME1, NAD-ME2, and NAD-MEH, and of mutants NADME1q and NAD-ME2q, overview; kinetic analysis and comparison of the different isozymes MAD-ME1, NAD-ME2, and NAD-MEH, and of mutants NADME1q and NAD-ME2q, overview
-
additional information
additional information
-
kinetics analysis of isozymes ME2 and ME3
-
additional information
additional information
Arabidopsis NAD-ME1 exhibits a non-hyperbolic behavior for the substrate L-malate and presents a sigmoidal kinetic response for L-malate. Fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme, overview; NAD-ME2 shows a typical hyperbolic behavior
-
additional information
additional information
Arabidopsis NAD-ME1 exhibits a non-hyperbolic behavior for the substrate L-malate and presents a sigmoidal kinetic response for L-malate. Fumarate binding turns NAD-ME1 into a hyperbolic and high substrate affinity enzyme, overview; NAD-ME2 shows a typical hyperbolic behavior
-
additional information
additional information
-
Michaelis-Menten kinetics
-
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TURNOVER NUMBER [1/s]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
31.1
(S)-malate
-
pH 6.4, temperature not specified in the publication, NAD-ME1
39
(S)-malate
-
pH 6.5, temperature not specified in the publication, NAD-MEH
44.1
(S)-malate
-
pH 6.6, temperature not specified in the publication, NAD-ME2
46
(S)-malate
-
isozyme NAD-ME2, pH 6.5, temperature not specified in the publication
31.1
NAD+
-
pH 6.4, temperature not specified in the publication, NAD-ME1
44.1
NAD+
-
pH 6.6, temperature not specified in the publication, NAD-ME2
46
NAD+
-
isozyme NAD-ME2, pH 6.5, temperature not specified in the publication
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kcat/KM VALUE [1/mMs-1]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
10.3
(S)-malate
-
pH 6.4, temperature not specified in the publication, NAD-ME1
14.2
(S)-malate
-
pH 6.5, temperature not specified in the publication, NAD-MEH
14.7
(S)-malate
-
pH 6.6, temperature not specified in the publication, NAD-ME2
60.2
NAD+
-
pH 6.4, temperature not specified in the publication, NAD-ME1
88.2
NAD+
-
pH 6.6, temperature not specified in the publication, NAD-ME2
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Ki VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
IMAGE
0.45
5'-AMP
-
versus NAD+, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
1.5
5'-AMP
-
versus (S)-malate, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
3
CO2
-
versus NAD+, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
7
CO2
-
versus (S)-malate, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
0.041
NADH
-
versus (S)-malate, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
0.15
NADH
-
versus NAD+, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
11
pyruvate
-
versus NAD+, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
14
pyruvate
-
versus (S)-malate, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
0.8
Tartrate
-
versus (S)-malate, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
4
Tartrate
-
versus NAD+, pH 6.5, temperature not specified in the publication, isozyme NAD-ME2
additional information
additional information
-
inhibition patterns by measuring the initial rate as a function of malate or NAD+ with NAD+ or malate maintained equal to its Km at different fixed concentrations of oxalate, including zero, Ki, 2Ki, and 4Ki at pH 7.0 and 30 mM free Mg2+
-
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
0.201
NAD+-dependent ME activity in the wild-type strain, pH 7.8, 30°C, AZC3656
4.25
-
purified native enzyme, pH 7.0, 25°C, carboxylation reaction; purified native enzyme, pH 7.0, 25°C, pyruvate carboxylation
36.09
-
purified native enzyme, pH 7.5, 25°C, decarboxylation reaction; purified native enzyme, pH 7.5, 25°C, malate decarboxylation
additional information
additional information
-
design of an assay procedure to minimize the influence of (S)-malate dehydrogenase and other factors
additional information
Mnium undulatum
-
changes in NADH contents in the leaves of plant species towards the end of the light or darkness periods, diurnal changes in malate and citrate contents in gametophores kept under control, hypoxia, high irradiance, drought stress, and CO2-free air conditions, comparison to other species, overiew
additional information
-
changes in NADH contents in the leaves of plant species towards the end of the light or darkness periods, diurnal changes in malate and citrate contents in gametophores kept under control, hypoxia, high irradiance, drought stress, and CO2-free air conditions, comparison to other species, overiew
additional information
-
changes in NADH contents in the leaves of plant species towards the end of the light or darkness periods, diurnal changes in malate and citrate contents in gametophores kept under control, hypoxia, high irradiance, drought stress, and CO2-free air conditions, comparison to other species, overiew
additional information
-
changes in NADH contents in the leaves of plant species towards the end of the light or darkness periods, diurnal changes in malate and citrate contents in gametophores kept under control, hypoxia, high irradiance, drought stress, and CO2-free air conditions, comparison to other species, overiew
additional information
-
isozyme expression levels, pyruvate cycling and isozyme activity in pancreatic islets, overview
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pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
6.4
6.5
6.6
6.8
7.4
7.5
7.8
AZC3656 shows high NAD+-ME activity at pH 7.8, with Michaelis-Menten-like kinetics, at various concentrations of malate, The enzyme exhibits only a very limited positive cooperativity with respect to malate
8.3
7
-
catalytically competent enzyme-substrate complex formed upon binding malate
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pH RANGE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
5.8 - 7.6
-
pH 5.8: about 60% of maximal activity, pH 7.6: about 40% of maximal activity
7 - 8.7
-
pH 7.0: about 30% of maximal activity, pH 8.7: about 45% of maximal activity
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TEMPERATURE OPTIMUM
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
25
30
37
50
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TEMPERATURE RANGE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
30 - 60
-
30°C: about 35% of maximal activity, 60°C: about 50% of maximal activity
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pI VALUE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
SOURCE
-
the level of the enzyme in wild-type bacteroids is not limiting for N2-fixation
-
; NAD-ME1and -2 subunits show a distinct patterns of accumulation in the separate components of the floral organ; NAD-ME1and -2 subunits show a distinct patterns of accumulation in the separate components of the floral organ
-
in mesophyll cells, 100% activity is found in cytosol fractions
-
NAD-MEH and NADME1 act in concert in this tissue; the NAD-ME1 subunit is present at a slightly higher proportion than the NAD-ME2 subunit, and thus, NAD-MEH and NADME1 act in concert in this tissue; the NAD-ME1 subunit is present at a slightly higher proportion than the NAD-ME2 subunit, and thus, NAD-MEH and NADME1 act in concert in this tissue
additional information
leaf crude extracts contain about 20% higher NAD-ME specific activities at the end of the night period than at the end of the day period, isozyme NAD-ME1 is more abundant during the night period; leaf crude extracts contain about 20% higher NAD-ME specific activities at the end of the night period than at the end of the day period, isozyme NAD-ME2 is more abundant during the night period
-
two molecular forms of malic enzyme are present in herring spermatozoa: an NAD-preferring malic enzyme with very high activity and an NADP-specific malic enzyme (EC 1.1.1.40) with much lower activity (ratio about 33:1)
-
high exnzyme activity; two molecular forms of malic enzyme are present in herring spermatozoa: an NAD-preferring malic enzyme with very high activity and an NADP-specific malic enzyme (EC 1.1.1.40) with much lower activity (ratio about 33:1)
-
two molecular forms of malic enzyme are present in herring spermatozoa: an NAD-preferring malic enzyme with very high activity and an NADP-specific malic enzyme (EC 1.1.1.40) with much lower activity (ratio about 33:1)
-
two molecular forms of malic enzyme are present in herring spermatozoa: an NAD-preferring malic enzyme with very high activity and an NADP-specific malic enzyme (EC 1.1.1.40) with much lower activity (ratio about 33:1)
-
two molecular forms of malic enzyme are present in herring spermatozoa: an NAD-preferring malic enzyme with very high activity and an NADP-specific malic enzyme (EC 1.1.1.40) with much lower activity (ratio about 33:1)
additional information
-
no enzyme activity is observed experimentally in chloroplasts of mesophyll and bundle sheath cells
additional information
tissue specific expression of the isozyme, overview; tissue specific expression of the isozyme, overview
additional information
tissue specific expression of the isozyme, overview; tissue specific expression of the isozyme, overview
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LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY
GeneOntology No.
LITERATURE
SOURCE
additional information
-
in the pre-anthesis phase NAD-ME isoform with MW 115 kDa occurs in cytosol of mesophyll and bundle sheath cells of control and drought-exposed plants. In mesophyll cells 100% activity is found in cytosol fractions, and about 9.4% of the total NAD-ME activity is localized in cytosol of bundle sheath cells
-
one of NAD-ME isoforms with MW 110 kDa is located in mitochondria of bundle sheath cells of control and drought-exposed plants, and another isoform of MW 121 kDa is formed in mitochondria of bundle sheath cells under influence of drought. After resuming watering the 121 kDa isoform disappears again. About 90.6% of the total NAD-ME activity is localized in mitochondrial stroma of bundle sheath cells
-
65% of the activity; predominantly in the matrix space
additional information
-
several molecular forms of NAD-ME with different subcellular localization patterns in the studied phases of amaranth ontogenesis. No enzyme activity is observed experimentally in chloroplasts of mesophyll and bundle sheath cells
-
additional information
-
subcellular localization determination by immunofluorescence analysis
-
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MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
58000
61000
64000
110000
-
mitochondrial isozyme of bundle sheath cells of control and drought-exposed plants
115000
-
cytosolis isozyme of mesophyll and bundle sheath cells of control and drought-exposed plants
120000
121000
-
mitochondrial isozyme of bundle sheath cells of drought-exposed plants
270000
490000
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SUBUNITS
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
dimer
oligomer
tetramer
additional information
dimer
2 * 58000, beta-subunit, isozyme NAD-ME2, SDS-PAGE; 2 * 65000, alpha-subunit, isozyme NAD-ME1, SDS-PAGE
dimer
-
isozymes NAD-ME1 and NAD-ME2 assemble as homo- and heterodimers, the latter is termed NAD-MEH, in vitro and in vivo. Interaction between NAD-ME1 and -ME2 generates a heteromeric enzyme NAD-MEH with a particular kinetic behaviour; isozymes NAD-ME1 and NAD-ME2 assemble as homo- and heterodimers, the latter is termed NAD-MEH, in vitro and in vivo. Interaction between NAD-ME1 and -ME2 generates a heteromeric enzyme NAD-MEH with a particular kinetic behaviour
tetramer
-
structure analysis from crystal structure, the enzyme is a tetrameric protein with double dimer quaternary structure, pH dependence of enzyme structure, overview
additional information
the isozyme NAD-ME1 is grouped into the clade that includes enzymes with alpha-subunits with molecular masses of approximately 65 kDa in the plant NAD-ME phylogenetic tree, isozymes NAD-ME1 and NAD-ME2 form both homo- and heterooligomers in vitro and in vivo, overview; the isozyme NAD-ME2 is grouped into the clades with enzymes possessing beta-subunits with molecular masses of approximately 58 kD in the plant NAD-ME phylogenetic tree, isozymes NAD-ME1 and NAD-ME2 form both homo- and heterooligomers in vitro and in vivo, overview
additional information
the isozyme NAD-ME1 is grouped into the clade that includes enzymes with alpha-subunits with molecular masses of approximately 65 kDa in the plant NAD-ME phylogenetic tree, isozymes NAD-ME1 and NAD-ME2 form both homo- and heterooligomers in vitro and in vivo, overview; the isozyme NAD-ME2 is grouped into the clades with enzymes possessing beta-subunits with molecular masses of approximately 58 kD in the plant NAD-ME phylogenetic tree, isozymes NAD-ME1 and NAD-ME2 form both homo- and heterooligomers in vitro and in vivo, overview
additional information
-
isozyme NAD-ME1 primary structure and domain analysis, overview; isozyme NAD-ME2 primary structure and domain analysis, overview; isozyme NAD-MEH primary structure and domain analysis, overview
additional information
Crassula argentea
-
the enzyme exists in at least three aggregational states: dimer, tetramer and octamer
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Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
enzyme in binary complex with NAD+, by hanging drop vapour diffusion method, from solution containing 5 mM NAD+, 10 mM tartronate, and 20 mM MgSO4, for cryoprotection soaking overnight in 100 mM Tris-HCl, pH 7.5, with 25% PEG w/v 15 mM NAD+, 10 mM 2-mercaptoethanol, and glycerol up to a final concentration of 20% v/v, X-ray diffraction structure determination and analysis at 2.3 A resolution, structure modeling
-
quarternary complex of purified enzyme with NADH, tartronate, and Mg2+, hanging drop vapour diffusion method, from 100 mM Tris-SO4, pH 7.3, 100 mM sodium acetate, 15% PEG 4000, 5 mM NADH, 10 mM tartronate, 20 mM MgSO4, 10 mM 2-mercaptoethanol, and 0.02% sodium azide, for cryoprotection the crystals are soaked in 25% PEG 4000, 15 mM NAD+, 10 mM 2-mercaptoethanol, and 100 mM Tris-SO4, pH 7.5, for 2 h, then 24 h in the crystallization buffer plus 20% EG v/v, X-ray diffraction structure determination and analysis at 2.0 A resolution, structure modeling
-
enzyme complexed with the natural substrate malate or pyruvate, NAD+ or NADH, Mn2+, and the allosteric activator fumarate, X-ray diffraction structure determination and analysis at 2.1 A resolution, structure modeling
-
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pH STABILITY
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY
LITERATURE
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GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
freezing of crude enzyme extract treated on Sephadex G-25 destroys activity
-
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OXIDATION STABILITY
ORGANISM
UNIPROT
LITERATURE
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STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
crude and partially purified enzyme retains activity for several months when stored as a protein suspension in 75% saturated (NH4)2SO4 solution
-
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Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
native enzyme 1500fold to homogeneity by ammonium sulfate fractionation, anion exchange and hydrophobic interaction chromatography, adsorption chromatography, ultrafiltration, and gel filtration
native enzyme 84.7fold by anion exchange and affinity chromatography, and gel filtration; native NAD-preferring malic enzyme 84.7fold by anion exchange and affinity chromatography followed by gel filtration
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native enzyme from fresh sperm cells by anion exchange and affinity chromatography and gel filtration to over 99% purity
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recombinant His-tagged enzyme AZC3656 from Escherichia coli by nickel affinity chromatography
recombinant His-tagged NAD-ME1 and mutants NADME1q and NAD-ME2q from Escherichia coli strain BL21(DE3) by nickel affinity chromatography and gel filtration; recombinant His-tagged NAD-ME2 and mutants NADME1q and NAD-ME2q from Escherichia coli strain BL21(DE3) by nickel affinity chromatography and gel filteration; recombinant His-tagged NAD-MEH from Escherichia coli strain BL21(DE3) by nickel affinity chromatography and gel filtration
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recombinant NAD-ME1, NAD-ME2, and NAD-MEH; recombinant NAD-ME1, NAD-ME2, and NAD-MEH
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Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
DNA and amino acid sequence determination and analysis, expression in Escherichia coli strain JM109
expression of His-tagged NAD-ME1 and of mutants NADME1q and NAD-ME2q in Escherichia coli strain BL21(DE3); expression of His-tagged NAD-ME2 and mutants NADME1q and NAD-ME2q in Escherichia coli strain BL21(DE3); expression of His-tagged NAD-MEH in Escherichia coli strain BL21(DE3)
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gene AtNAD-ME1, DNA and amino acid sequence determination and analysis, phylogenetic tree; gene AtNAD-ME2, DNA and amino acid sequence determination and analysis, phylogenetic tree
gene dme or azc3656, DNA and amino acid sequence determination and analysis, expression as His-tagged enzyme in Escherichia coli
gene maeE, is encoded in a cluster consisting of two diverging operons, maePE and maeKR, DNA and amino acid sequence determination and analysis, phylogenetic analysis
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gene ME1, quantitative RT-PCR expression analysis of isozymes Me1, Me2, and Me3 in wild-type strain and mutant Me1 strains
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