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. 1989 Oct;171(10):5542–5550. doi: 10.1128/jb.171.10.5542-5550.1989

Cloning, sequencing, and expression of the gene for NADH-sensitive citrate synthase of Pseudomonas aeruginosa.

L J Donald 1, G F Molgat 1, H W Duckworth 1
PMCID: PMC210395  PMID: 2507528

Abstract

The structural gene for the allosteric citrate synthase of Pseudomonas aeruginosa has been cloned from a genomic library by using the Escherichia coli citrate synthase gene as a hybridization probe under conditions of reduced stringency. Subcloning of portions of the original 10-kilobase-pair (kbp) clone led to isolation of the structural gene, with its promoter, within a 2,083-bp length of DNA flanked by sites for KpnI and BamHI. The nucleotide sequence of this fragment is presented; the inferred amino acid sequence was 70 and 76% identical, respectively, with the citrate synthase sequences from E. coli and Acinetobacter anitratum, two other gram-negative bacteria. DEAE-cellulose chromatography of P. aeruginosa citrate synthase from an E. coli host harboring the cloned P. aeruginosa gene gave three peaks of activity. All three enzyme peaks had subunit molecular weights of 48,000; the proteins were identical by immunological criteria and very similar in kinetics of substrate saturation and NADH inhibition. Because the cloned gene contained only one open reading frame large enough to encode a polypeptide of such a size, the three peaks must represent different forms of the same protein. A portion of the cloned P. aeruginosa gene was used as a hybridization probe under stringent conditions to identify highly homologous sequences in genomic DNA of a second strain classified as P. aeruginosa and isolates of P. putida, P. stutzeri, and P. alcaligenes. When crude extracts of each of these four isolates were mixed with antiserum raised against purified P. aeruginosa citrate synthase, however, only the P. alcaligenes extract cross-reacted.

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Selected References

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