Two forms of NAD-dependent d-mandelate dehydrogenase (d-ManDHs) were purified from Enterococcus faecalis IAM 10071. While these two enzymes consistently exhibited high activity toward large 2-ketoacid substrates that were branched at the C3 or C4 position, they gave distinctly different Km
and V
max values for these substrates and had distinct molecular weights by gel electrophoresis and gel filtration.
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