Regulation of glpD and glpE gene expression by a cyclic AMP-cAMP receptor protein (cAMP-CRP) complex in Escherichia coli.
The glpE gene of E. coli was found to be transcribed divergently with respect to glpD, which is adjacent to glpE head-to-head on the E. coli chromosome. We constructed glpD- and/or glpE-lacZ fusion plasmids, which provided glpD and lacZ as reporter genes. The expression of glpD and glpE, under the control of the cAMP-CRP complex, was examined by measuring the activities in E. coli cells of beta-galactosidase encoded by lacZ and glycerol-3-phosphate dehydrogenase encoded by glpD. In the double-reporter-gene system, the expression of glpD and glpE was found to be positively regulated by cAMP-CRP. We also confirmed that intracellular levels of the translation products and the transcripts from glpD and glpE were positively regulated by cAMP-CRP. The cAMP-mediated induction of gene expression of glpD and glpE was significantly affected by structural alterations of the single CRP-binding site between glpD and glpE. These results indicate that the single CRP-binding site is a cis-acting element involved in the positive regulation of the expression of both glpD and glpE at the transcriptional level.
Choi
Y L
YL
Department of Agricultural Chemistry, Kyoto University, Japan.
Kawase
S
S
Kawamukai
M
M
Sakai
H
H
Komano
T
T
D001483:Base Sequence; D002352:Carrier Proteins / Q000378:metabolism*; D002876:Chromosomes, Bacterial; D000242:Cyclic AMP / Q000378:metabolism*; D002373:Cyclic AMP Receptor Protein; D004587:Electrophoresis, Agar Gel; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D010957:Plasmids; D011953:Receptors, Cyclic AMP / Q000378:metabolism*; D014158:Transcription, Genetic
D002352:Carrier Proteins; D002373:Cyclic AMP Receptor Protein; D011953:Receptors, Cyclic AMP; D000242:Cyclic AMP