Class name for those enzymes that oxidize substrates by catalyzing removal of hydrogen from metabolites (hydrogen donors) and transferring it to other substances (hydrogen acceptors), which are thus reduced; most of the oxidative enzymes (oxidoreductases, EC class 1) perform their oxidations in this manner.
aerobic d. an enzyme (usually a metalloflavoenzyme) catalyzing the transfer of hydrogen from some metabolite to oxygen, forming hydrogen peroxide in the process; usually a metalloflavoenzyme; e.g., xanthine oxidase and others in several sub-subclasses (e.g., EC 1.1.3, 1.2.3, 1.7.3, 1.8.3, 1.10.3).
a-keto acid d. See a-keto acid dehydrogenase.
anaerobic d. an enzyme (usually a pyridinoenzyme) catalyzing the transfer of hydrogen from some metabolite to some acceptor molecule (e.g., NAD+, cytochrome) other than oxygen; e.g., lactate d.'s, isocitrate d.'s, and others in EC class 1, excluding those listed under aerobic d.
Robison ester d. glucose-6-phosphate dehydrogenase
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