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. 1992 Oct;174(20):6590–6599. doi: 10.1128/jb.174.20.6590-6599.1992

Identification and molecular characterization of the acetyl coenzyme A synthetase gene (acoE) of Alcaligenes eutrophus.

H Priefert 1, A Steinbüchel 1
PMCID: PMC207630  PMID: 1356967

Abstract

The gene locus acoE, which is involved in the utilization of acetoin in Alcaligenes eutrophus, was identified as the structural gene of an acetyl coenzyme A synthetase (acetate:coenzyme A ligase [AMP forming]; EC 6.2.1.1). This gene was localized on a 3.8-kbp SmaI-EcoRI subfragment of an 8.1-kbp EcoRI restriction fragment (fragment E) that was cloned recently (C. Fründ, H. Priefert, A. Steinbüchel, and H. G. Schlegel, J. Bacteriol. 171:6539-6548, 1989). The 1,983 bp acoE gene encoded a protein with a relative molecular weight of 72,519, and it was preceded by a putative Shine-Dalgarno sequence. A comparison analysis of the amino acid sequence deduced from acoE revealed a high degree of homology to primary structures of acetyl coenzyme A synthetases from other sources (amounting to up to 50.5% identical amino acids). Tn5 insertions in two transposon-induced mutants of A. eutrophus, that were impaired in the catabolism of acetoin were mapped 481 and 1,159 bp downstream from the translational start codon of acoE. The expression of acoE in Escherichia coli led to the formation of an acyl coenzyme A synthetase that accepted acetate as the preferred substrate (100% relative activity) but also reacted with propionate (46%) and hydroxypropionate (87%); fatty acids consisting of four or more carbon atoms were not accepted. In addition, evidence for the presence of a second acyl coenzyme A synthetase was obtained; this enzyme exhibited a different substrate specificity. The latter enzyme is obviously required for the activation of propionate, e.g., during the formation of the storage compound poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) when propionate is provided as the sole carbon source. An analysis of mutants provided evidence that the expression of the uptake protein for propionate depends on the presence of alternate sigma factor sigma 54.

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Selected References

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