1.1.1.337: L-2-hydroxycarboxylate dehydrogenase (NAD+)

This is an abbreviated version!
For detailed information about L-2-hydroxycarboxylate dehydrogenase (NAD+), go to the full flat file.

Word Map on EC 1.1.1.337

Reaction

a (2S)-2-hydroxycarboxylate
+
NAD+
=
a 2-oxocarboxylate
+
NADH
+
H+

Synonyms

(R)-sulfolactate dehydrogenase, ComC, L-2-hydroxyacid dehydrogenase, L-2-hydroxyacid dehydrogenase (NAD+), L-2-hydroxyisocaproate dehydrogenase, L-HicDH, L-hydroxyisocaproate dehydrogenase, L-sulfolactate dehydrogenase, MDH I, MJ1425, sulfolactate dehydrogenase

ECTree

     1 Oxidoreductases
         1.1 Acting on the CH-OH group of donors
             1.1.1 With NAD+ or NADP+ as acceptor
                1.1.1.337 L-2-hydroxycarboxylate dehydrogenase (NAD+)

Engineering

Engineering on EC 1.1.1.337 - L-2-hydroxycarboxylate dehydrogenase (NAD+)

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PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
del I81/delK82
phenylpyruvate is the only substrate which is converted at a significant catalytic rate by the mutant enzyme. In the publication this mutant is referred to as Ile100ADELTA/Lys100BDELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
del I81/delK82/delN87/delP88
specific modifications in catalytic rates and substrate recognition
del L 83
deletion mutant shows an altered substrate specificity. In the publication this mutant is referred to as Leu101DELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
delI81
drastic reductions in the catalytic activity for all tested substrates. In the publication this mutant is referred to as Ile100ADELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
delK82
drastic reductions in the catalytic activity for all tested substrates. In the publication this mutant is referred to as Lys100BDELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
delN87
deletion mutant shows an altered substrate specificity. In the publication this mutant is referred to as Asn105ADELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
delN87/delP88
for the deletion mutant enzyme 2-oxo carboxylic acids branched at C4 are better substrates than 2-oxocaproate, the substrate with the best kcat,/KM ratio known for the wild-type enzyme.The mutation results in a 5.2fold increased catalytic efficiency towards 4-methyl-2-oxopentanoate compared to the wild-type enzyme. In the publication this mutant is referred to as Asn105ADELTA/Pro105BDELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
delP88
deletion mutant shows an altered substrate specificity. In the publication this mutant is referred to as Pro105BDELTA, according to the numbering system of the dogfish L-lactate dehydrogenase coenzyme loop region
F236S
phenylpyruvate displays the largest kcat of the tested substrates. All kcat values, with the exception of phenylpyruvate, are reduced, but the relative acceptance of phenylglyoxylate is greatly increased
F236V
decrease in the second-order rate constants for all tested substrates. The kcat values for the smaller substrates decrease drastically. Phenylpyruvate is the favourite substrate (2-oxocaproate is the favourite substrate of the wild-type enzyme)
G234V/G235D
the second-order rate constant decreased for most substrates with the exception of pyruvate, which reacts 2.5times faster in the mutant enzyme than in the wild-type enzyme. The catalysis of 2-oxoisocaproate is unaffected
L239A
shift of enzyme specificity towards the substrates branched at C3 corresponding to an increase in the turnover numbers for 2-oxoisocaproate
L239F
slight decrease in the KM values for phenylglyoxylate combined with a dramatic decrease in the kcat values
L239M
KM values of all substrates of the enzyme variant are very similar to those of the wild-type enzyme, large improvement in the kcat values of the C4-branched substrates 2-oxoisocaproate and phenylpyruvate, decrease in the turnover number of 2-oxocaproate (the substrate favoured by the wild-type enzyme). Whereas in the wild-type enzyme the second-order rate constant for 2-oxoisocaproate is only 1% of that for the unbranched substrate, in the mutant enzyme the rate constant of 2-oxocaproate is only 18% of that for 2-oxoisocaproate
L239M/T245A
the catalytic rates are reduced by several orders of magnitude and the KM values shows at least a 100fold increase for most substrates (with the exception of phenylglyoxylate). With respect to L239M the substrate specificity shifts towards keto-tert-leucine and with respect to T245A 2-oxoisocaproate and phenylpyruvate are more favoured
L239W
slight decrease in the KM values for phenylglyoxylate combined with a dramatic decrease in the kcat values
T245A
the catalytic rates are reduced by several orders of magnitude, relative shift of substrate specificity for keto-tert-leucine of more than 17 000 compared with the 2-oxocaproate (kcat/KM)
additional information