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J Bacteriol. 1992 November; 174(22): 7149-7158

research-article

Molecular characterization of two Clostridium acetobutylicum ATCC 824 butanol dehydrogenase isozyme genes.

Department of Chemical Engineering, Northwestern University, Evanston, Illinois 60208.

ABSTRACT

A 4-kb segment of DNA containing two previously cloned butanol dehydrogenase (BDH) isozyme genes (D. Petersen, R. Welch, F. Rudolph, and G. Bennett, J. Bacteriol. 173:1831-1834, 1991) was sequenced. Two complete open reading frames (ORFs) were identified (bdhA and bdhB), along with a third truncated ORF (ORF1). The translation products of bdhA and bdhB corresponded to the N-terminal sequences of the purified BDH I and BDH II proteins, respectively. The two isozymes had a high amino acid identity (73%) and showed homology to a newly described class of alcohol dehydrogenases. Northern blots revealed that bdhA and bdhB did not form an operon. Primer extension experiments located single transcriptional start sites 37 and 58 bp upstream of the start codons of bdhA and bdhB, respectively. The -10 and -35 promoter regions for these genes were almost identical. bdhA and bdhB were found to be induced or derepressed immediately prior to significant butanol production in controlled pH 5.0 batch fermentations.

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