Aldehyde dehydrogenase. An enzyme with two distinct catalytic activities at a single type of active site

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Abstract
The evidence for and against the esterase and dehydrogenase active sites of aldehyde dehydrogenase being topologically distinct is examined. It is found that all the evidence (including all that previously amassed by others in favour of distinct binding domains) is actually consistent with, and in favour of, a single type of catalytic site having both activities. The existence of separate high-Km modulating sites for the enzyme is also questioned.