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. 1995 Apr;177(8):2157–2163. doi: 10.1128/jb.177.8.2157-2163.1995

Carbon monoxide-induced activation of gene expression in Rhodospirillum rubrum requires the product of cooA, a member of the cyclic AMP receptor protein family of transcriptional regulators.

D Shelver 1, R L Kerby 1, Y He 1, G P Roberts 1
PMCID: PMC176861  PMID: 7721706

Abstract

Induction of the CO-oxidizing system of the photosynthetic bacterium Rhodospirillum rubrum is regulated at the level of gene expression by the presence of CO. In this paper, we describe the identification of a gene that is required for CO-induced gene expression. An 11-kb deletion of the region adjacent to the previously characterized cooFSCTJ region resulted in a mutant unable to synthesize CO dehydrogenase in response to CO and unable to grow utilizing CO as an energy source. A 2.5-kb region that corresponded to a portion of the deleted region complemented this mutant for its CO regulation defect, restoring its ability to grow utilizing CO as an energy source. When the 2.5-kb region was sequenced, one open reading frame, designated cooA, predicted a product showing similarity to members of the cyclic AMP receptor protein (CRP) family of transcriptional regulators. The product, CooA, is 28% identical (51% similar) to CRP and 18% identical (45% similar) to FNR from Escherichia coli. The insertion of a drug resistance cassette into cooA resulted in a mutant that could not grow utilizing CO as an energy source. CooA contains a number of cysteine residues substituted at, or adjacent to, positions that correspond to residues that contact cyclic AMP in the crystal structure of CRP. A model based on this observation is proposed for the recognition of CO by Cooa. Adjacent to cooA are two genes, nadB and nadC, with predicted products similar to proteins in other bacteria that catalyze reactions in the de novo synthesis of NAD.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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