Information on EC 2.3.1.79 - maltose O-acetyltransferase

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The enzyme appears in viruses and cellular organisms

EC NUMBER
COMMENTARY hide
2.3.1.79
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RECOMMENDED NAME
GeneOntology No.
maltose O-acetyltransferase
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
acetyl-CoA + maltose = CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-D-glucose
show the reaction diagram
not identical with EC 2.3.1.18 galactoside O-acetyltransferase
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REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Acyl group transfer
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SYSTEMATIC NAME
IUBMB Comments
acetyl-CoA:maltose O-acetyltransferase
Not identical with EC 2.3.1.18, galactoside O-acetyltransferase. The acetyl group is added exclusively to the C6 position of glucose and to the C6 position of the non-reducing glucose residue of maltose [3]. Other substrates of this enzyme are glucose, which is a better substrate than maltose [2], and mannose and frucose, which are poorer substrates than maltose [2]. Isopropyl-beta-thio-galactose, which is a good substrate for EC 2.3.1.118 is a poor substrate for this enzyme [3].
CAS REGISTRY NUMBER
COMMENTARY hide
81295-47-8
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ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
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Uniprot
Manually annotated by BRENDA team
strain K12
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Manually annotated by BRENDA team
SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
acetyl-CoA + 3-O-methyl-D-glucopyranose
CoA + 6-O-acetyl-3-O-methyl-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + 4-nitrophenyl alpha-D-glucopyranoside
CoA + 4-nitrophenyl 6-O-acetyl-alpha-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + 4-nitrophenyl alpha-D-maltoside
CoA + 4-nitrophenyl 4-O-(6-O-acetyl-alpha-D-glucopyranosyl)-alpha-D-glucopyranoside
show the reaction diagram
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-
?
acetyl-CoA + 4-nitrophenyl beta-D-glucopyranoside
CoA + 4-nitrophenyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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-
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?
acetyl-CoA + 4-nitrophenyl beta-D-maltoside
CoA + 4-nitrophenyl 4-O-(6-O-acetyl-alpha-D-glucopyranosyl)-beta-D-glucopyranoside
show the reaction diagram
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-
-
?
acetyl-CoA + D-fructose
CoA + 6-O-acetyl-D-fructose
show the reaction diagram
acetyl-CoA + D-galactose
CoA + 6-O-acetyl-D-galactose
show the reaction diagram
acetyl-CoA + D-glucosamine
CoA + 6-O-acetyl-D-glucosamine
show the reaction diagram
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-
?
acetyl-CoA + D-glucose
CoA + acetyl-D-glucose
show the reaction diagram
acetyl-CoA + D-mannose
CoA + 6-O-acetyl-D-mannose
show the reaction diagram
acetyl-CoA + isomaltose
CoA + 6-O-(6-O-acetyl-alpha-D-glucopyranosyl)-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + isopropyl beta-D-thiogalactoside
CoA + isopropyl 6-O-acetyl-beta-D-thiogalactoside
show the reaction diagram
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?
acetyl-CoA + isopropyl beta-D-thioglucopyranoside
CoA + isopropyl 6-O-acetyl-beta-D-thioglucopyranoside
show the reaction diagram
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?
acetyl-CoA + lactose
CoA + 4-O-(6-O-acetyl-beta-D-galactopyranosyl)-beta-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + maltodextrine
CoA + ?
show the reaction diagram
acetyl-CoA + maltoheptaose
CoA + acetyl-maltoheptaose
show the reaction diagram
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?
acetyl-CoA + maltohexaose
CoA + acetyl-maltohexaose
show the reaction diagram
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?
acetyl-CoA + maltooligosaccharide
CoA + ?
show the reaction diagram
acetyl-CoA + maltopentaose
CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + maltose
CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-D-glucose
show the reaction diagram
acetyl-CoA + maltotetraose
CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + maltotriose
CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-alpha-D-glucopyranosyl-(1->4)-D-glucopyranose
show the reaction diagram
acetyl-CoA + methyl alpha-D-glucopyranoside
CoA + methyl 6-O-acetyl-alpha-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + methyl beta-D-glucopyranoside
CoA + methyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-decyl beta-D-glucopyranoside
CoA + n-decyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-decyl beta-D-maltoside
CoA + n-decyl 4-O-(6-O-acetyl-alpha-D-glucopyranosyl)-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-dodecyl beta-D-maltoside
CoA + n-dodecyl 4-O-(6-O-acetyl-alpha-D-glucopyranosyl)-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-heptyl beta-D-glucopyranoside
CoA + n-heptyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-heptyl beta-D-thioglucopyranoside
CoA + n-heptyl 6-O-acetyl-beta-D-thioglucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-hexyl beta-D-glucopyranoside
CoA + n-hexyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-nonyl beta-D-glucopyranoside
CoA + n-nonyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-octyl alpha-glucopyranoside
CoA + n-octyl 6-O-acetyl-alpha-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-octyl beta-D-glucopyranoside
CoA + n-octyl 6-O-acetyl-beta-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + n-octyl beta-D-thioglucopyranoside
CoA + n-octyl 6-O-acetyl-beta-D-thioglucopyranoside
show the reaction diagram
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?
acetyl-CoA + nigerose
CoA + 3-O-(6-O-acetyl-alpha-D-glucopyranosyl)-D-glucopyranose
show the reaction diagram
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?
acetyl-CoA + sucrose
CoA + beta-D-fructofuranosyl 6-O-acetyl-alpha-D-glucopyranoside
show the reaction diagram
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?
acetyl-CoA + thiomaltose
CoA + acetyl-thiomaltose
show the reaction diagram
acetyl-CoA + triethanolamine
CoA + acetyl-triethanolamine
show the reaction diagram
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?
additional information
?
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NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
acetyl-CoA + maltose
CoA + 6-O-acetyl-alpha-D-glucopyranosyl-(1->4)-D-glucose
show the reaction diagram
additional information
?
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strains lacking MalQ and maltose transacetylase are tested for their ability to accumulate maltose. At 1.8 nM external maltose, the ratio of internal to external maltose concentration under equilibrium conditions reaches 10ooooo to 1 but declines at higher external maltose concentrations. The maximal internal level of maltose at increasing external maltose concentrations is around 100 mM
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INHIBITORS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
CoA-SH
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product inhibition
KM VALUE [mM]
SUBSTRATE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
0.018
acetyl-CoA
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62
D-glucose
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90
maltose
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40
triethanolamine
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SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
pH OPTIMUM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
pH RANGE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
40000
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gel filtration
SUBUNITS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Crystallization/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
crystals belong to space group C222(1), a 64.7 A, b 106.6 A and c 0 176.0 A
TEMPERATURE STABILITY
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
40
stable for at least 4 h
STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
-70°C, enzyme stored frozen in presence of 0.1% 2-mercaptoethanol and 40% glycerol without appreciable loss of activity
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Purification/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
Cloned/COMMENTARY
ORGANISM
UNIPROT
LITERATURE
cloning of the maa gene and overexpression of MAT
cloning of the structural gene mac
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APPLICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
nutrition
biotechnologically attractive for the modification of starch and maltooligosaccharides
Show AA Sequence (1301 entries)
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