Abstract
The gene encoding of an alcohol dehydrogenase C (ADHC) from Mycobacterium smegmatis was cloned and sequenced. The protein encoded by this gene has 78% identity with Mycobacterium tuberculosis and Mycobacterium bovis BCG ADHC. The M. smegmatis ADHC was purified from M. smegmatis and the kinetic parameters of this enzyme showed that using NADPH as electron donor it has a strong preference for aliphatic and aromatic aldehyde substrates. Like the M. bovis BCG ADHC, this enzyme is more likely to act as an aldehyde reductase than as an alcohol dehydrogenase. The discovery of such an ADHC in a fast-growing, and easily engineered mycobacterial species opens the way to the utilisation of this M. smegmatis enzyme as a convenient model for the study of the physiological role of this alcohol dehydrogenase in mycobacteria.
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