Environmentally regulated algD promoter is responsive to the cAMP receptor protein in Escherichia coli.
The environmentally activated algD promoter of Pseudomonas aeruginosa has been shown to be influenced by DNA supercoiling. It is believed that protein-induced bending or looping is required for this activation. We studied the role of Escherichia coli cAMP-CRP on algD promoter activation in E. coli and show that a functional CRP is required for this activation. We also demonstrate that the algD promoter is sensitive to glucose repression both in E. coli and P. aeruginosa. Deletion of a putative consensus CRP binding sequence upstream of the algD promoter renders the promoter non-responsive to glucose repression. The involvement of cAMP-CRP complex in the activation of the algD promoter in E. coli has been demonstrated directly through binding of a 255 base pair DNA fragment containing the putative consensus CRP binding sequence. Other fragments, upstream or downstream but without any consensus CRP binding sequence, did not show any binding with CRP. A CRP-like analogue, similar to that in Xanthomonas campestris, but capable of activating genes without forming a complex with cAMP, is believed to allow glucose repression in P. aeruginosa.
DeVault
J D
JD
Department of Microbiology and Immunology (M/C 790), University of Illinois College of Medicine, Chicago 60612.
Hendrickson
W
W
Kato
J
J
Chakrabarty
A M
AM
D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D000242:Cyclic AMP / Q000378:metabolism; D002373:Cyclic AMP Receptor Protein; D004269:DNA, Bacterial / Q000235:genetics; D004278:DNA, Superhelical / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000502:physiology; D015964:Gene Expression Regulation, Bacterial; D005947:Glucose / Q000494:pharmacology; D008969:Molecular Sequence Data; D010957:Plasmids; D011401:Promoter Regions, Genetic / Q000187:drug effects; D011485:Protein Binding; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000235:genetics* / Q000502:physiology; D011953:Receptors, Cyclic AMP / Q000235:genetics* / Q000378:metabolism; D015183:Restriction Mapping
D001426:Bacterial Proteins; D002352:Carrier Proteins; D002373:Cyclic AMP Receptor Protein; D004269:DNA, Bacterial; D004278:DNA, Superhelical; D004268:DNA-Binding Proteins; D011953:Receptors, Cyclic AMP; D000242:Cyclic AMP; D005947:Glucose