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In Clostridium acetobutylicum, conversion of butyraldehyde to butanol is enzymatically achieved by butanol dehydrogenase (BDH). A C. acetobutylicum gene that encodes this protein was identified by using an oligonucleotide designed on the basis of the N-terminal amino acid sequence of purified C. acetobutylicum NADH-dependent BDH. Enzyme assays of cell extracts of Escherichia coli harboring the clostridial gene demonstrated 15-fold-higher NADH-dependent BDH activity than untransformed E. coli, as well as an additional NADPH-dependent BDH activity. Kinetic, sequence, and isoelectric focusing analyses suggest that the cloned clostridial DNA contains two or more distinct C. acetobutylicum enzymes with BDH activity.

Molecular cloning of an alcohol (butanol) dehydrogenase gene cluster from Clostridium acetobutylicum ATCC 824