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Molecular cloning and DNA sequencing of the Escherichia coli K-12 ald gene encoding aldehyde dehydrogenase.

Department of Biochemistry, School of Pharmacy, University of Barcelona, Spain.

ABSTRACT

The gene ald, encoding aldehyde dehydrogenase, has been cloned from a genomic library of Escherichia coli K-12 constructed with plasmid pBR322 by complementing an aldehyde dehydrogenase-deficient mutant. The ald region was sequenced, and a single open reading frame of 479 codons specifying the subunit of the aldehyde dehydrogenase enzyme complex was identified. Determination of the N-terminal amino acid sequence of the enzyme protein unambiguously established the identity and the start codon of the ald gene. Analysis of the 5'- and 3'-flanking sequences indicated that the ald gene is an operon. The deduced amino acid sequence of the ald gene displayed homology with sequences of several aldehyde dehydrogenases of eukaryotic origin but not with microbial glyceraldehyde-3-phosphate dehydrogenase.

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