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J. Bacteriol., 05 1995, 2878-2886, Vol 177, No. 10
S Kumari, R Tishel, M Eisenbach and AJ Wolfe
Acetyl coenzyme A synthetase (Acs) activates acetate to acetyl coenzyme A
through an acetyladenylate intermediate; two other enzymes, acetate kinase
(Ack) and phosphotransacetylase (Pta), activate acetate through an acetyl
phosphate intermediate. We subcloned acs, the Escherichia coli open reading
frame purported to encode Acs (F. R. Blattner, V. Burland, G. Plunkett III,
H. J. Sofia, and D. L. Daniels, Nucleic Acids Res. 21:5408-5417, 1993). We
constructed a mutant allele, delta acs::Km, with the central 0.72-kb
BclI-BclI portion of acs deleted, and recombined it into the chromosome.
Whereas wild-type cells grew well on acetate across a wide range of
concentrations (2.5 to 50 mM), those deleted for acs grew poorly on low
concentrations (< or = 10 mM), those deleted for ackA and pta (which
encode Ack and Pta, respectively) grew poorly on high concentrations (>
or = 25 mM), and those deleted for acs, ackA, and pta did not grow on
acetate at any concentration tested. Expression of acs from a multicopy
plasmid restored growth to cells deleted for all three genes. Relative to
wild-type cells, those deleted for acs did not activate acetate as well,
those deleted for ackA and pta displayed even less activity, and those
deleted for all three genes did not activate acetate at any concentration
tested. Induction of acs resulted in expression of a 72-kDa protein, as
predicted by the reported sequence. This protein immunoreacted with
antiserum raised against purified Acs isolated from an unrelated species,
Methanothrix soehngenii.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Cloning, characterization, and functional expression of acs, the gene which encodes acetyl coenzyme A synthetase in Escherichia coli
Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, Illinois 60153, USA.
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