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. 1991 Nov;173(22):7204–7212. doi: 10.1128/jb.173.22.7204-7212.1991

Cloning of a catabolite repression control (crc) gene from Pseudomonas aeruginosa, expression of the gene in Escherichia coli, and identification of the gene product in Pseudomonas aeruginosa.

C H MacGregor 1, J A Wolff 1, S K Arora 1, P V Phibbs Jr 1
PMCID: PMC209226  PMID: 1657883

Abstract

Mutants which are defective in catabolite repression control (CRC) of multiple independently regulated catabolic pathways have been previously described. The mutations were mapped at 11 min on the Pseudomonas aeruginosa chromosome and designated crc. This report describes the cloning of a gene which restores normal CRC to these Crc- mutants in trans. The gene expressing this CRC activity was subcloned on a 2-kb piece of DNA. When this 2-kb fragment was placed in a plasmid behind a phage T7 promoter and transcribed by T7 RNA polymerase, a soluble protein with a molecular weight (MW) of about 30,000 was produced in Escherichia coli. A soluble protein of identical size was overproduced in a Crc- mutant when it contained the 2-kb fragment on a multicopy plasmid. This protein could not be detected in the mutant containing the vector without the 2-kb insert or with no plasmid. When a 0.3-kb AccI fragment was removed from the crc gene and replaced with a kanamycin resistance cassette, the interrupted crc gene no longer restored CRC to the mutant, and the mutant containing the interrupted gene no longer overproduced the 30,000-MW protein. Pools of intracellular cyclic AMP and the activities of adenylate cyclase and phosphodiesterase were measured in mutant and wild-type strains with and without a plasmid containing the crc gene. No consistent differences between any strains were found in any case. These results provide original evidence for a 30,000-MW protein encoded by crc+ that is required for wild-type CRC in P. aeruginosa and confirms earlier reports that the mode of CRC is cyclic AMP independent in this bacterium.

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Selected References

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