Cloning of the Zymomonas mobilis structural gene encoding alcohol dehydrogenase I (adhA): Sequence comparison and expression in Escherichia coli

Journal Article · Tue May 01 04:00:00 EDT 1990 · Journal of Bacteriology; (USA)

OSTI ID:6534222

Keshav, K F; Yomano, L P; An, Haejung; Ingram, L O ^[1]

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1. Univ. of Florida, Gainesville (USA)

Zymomonas mobilis ferments sugars to produce ethanol with two biochemically distinct isoenzymes of alcohol dehydrogenase. The adhA gene encoding alcohol dehydrogenase I has now been sequenced and compared with the adhB gene, which encodes the second isoenzyme. The deduced amino acid sequences for these gene products exhibited no apparent homology. Alcohol dehydrogenase I contained 337 amino acids, with a subunit molecular weight of 36,096. Based on comparisons of primary amino acid sequences, this enzyme belongs to the family of zinc alcohol dehydrogenases which have been described primarily in eucaryotes. Nearly all of the 22 strictly conserved amino acids in this group were also conserved in Z. mobilis alcohol dehydrogenase I. Alcohol dehydrogenase I is an abundant protein, although adhA lacked many of the features previously reported in four other highly expressed genes from Z. mobilis. Codon usage in adhA is not highly biased and includes many codons which were unused by pdc, adhB, gap, and pgk. The ribosomal binding region of adhA lacked the canonical Shine-Dalgarno sequence found in the other highly expressed genes from Z. mobilis. Although these features may facilitate the expression of high enzyme levels, they do not appear to be essential for the expression of Z. mobilis adhA.

• DOE Contract Number: FG05-86ER13575
• OSTI ID: 6534222
• Journal Information: Journal of Bacteriology; (USA), Journal Name: Journal of Bacteriology; (USA) Vol. 172:5; ISSN JOBAA; ISSN 0021-9193
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
ALCOHOL DEHYDROGENASE
ALCOHOLS
AMINO ACID SEQUENCE
BACTERIA
BIOSYNTHESIS
CLONING
DNA HYBRIDIZATION
DNA-CLONING
ENZYMES
ESCHERICHIA COLI
ETHANOL
GENES
HEMIACETAL DEHYDROGENASES
HYBRIDIZATION
HYDROXY COMPOUNDS
MICROORGANISMS
MOLECULAR STRUCTURE
ORGANIC COMPOUNDS
OXIDOREDUCTASES
SYNTHESIS
ZYMOMONAS MOBILIS