Mechanism of CcpA-mediated glucose repression of the resABCDE operon of Bacillus subtilis.
The resABCDE operon of Bacillus subtilis encodes a three-protein complex involved in cytochrome c biogenesis as well as the ResE sensor kinase and the ResD response regulator that control electron transfer and other functions in response to oxygen availability. We have investigated the mechanism of CcpA-mediated control of res operon expression which occurs maximally in the stationary phase of growth. Two CcpA-binding (CRE) sites were found in the res operon, one (CRE1) in the control region in front of the resA promoter, the other (CRE2) in the resB structural gene. Both CRE sites proved to be essential for full CcpA-mediated glucose repression of res operon expression. We propose that both looping and road block mechanisms are involved in res operon control by CcpA.
Choi
Soo-Keun
SK
Division of Biological Sciences, University of California at San Diego, La Jolla, Calif., USA.
Saier
Milton H
MH
D001412:Bacillus subtilis / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000378:metabolism / Q000502:physiology*; D004268:DNA-Binding Proteins / Q000378:metabolism / Q000502:physiology*; D015964:Gene Expression Regulation, Bacterial; D005947:Glucose / Q000502:physiology*; D009876:Operon; D017354:Point Mutation / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics; D012097:Repressor Proteins / Q000502:physiology*; D014157:Transcription Factors / Q000378:metabolism
D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; C100386:ResD protein, Bacillus subtilis; D014157:Transcription Factors; C069286:catabolite control proteins, bacteria; D005947:Glucose