Transcription of the principal sigma-factor genes, rpoD and rpoS, in Pseudomonas aeruginosa is controlled according to the growth phase.
The rpoS gene encodes the second principal sigma factor of RNA polymerase in stationary-phase cells in Escherichia coli. We examined the transcription of Pseudomonas aeruginosa rpoS as to the growth of cells. The results of quantitative S1 nuclease mapping of rpoS and rpoD, encoding the principal sigma factor, indicated that the transcription of rpoS is induced in stationary-phase cells, whereas that of rpoD is induced in exponential-phase cells. By high-resolution S1 nuclease mapping, the 5'- and 3'-ends of rpoS mRNA were determined. The results indicated that rpoS is transcribed as a monocistronic mRNA. The sequence preceding the 5' end of rpoS mRNA showed poor homology to the consensus sequences of the previously known promoters. P. aeruginosa rpoS was not transcribed in E. coli. By in vitro transcription assaying, P. aeruginosa rpoS was shown to be transcribed by the RNA polymerase fraction containing the principal sigma (sigma 70)-RNA polymerase of P. aeruginosa.
Fujita
M
M
Department of Biotechnology, Faculty of Engineering, Fukuyama University, Hiroshima, Japan.
Tanaka
K
K
Takahashi
H
H
Amemura
A
A
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D001483:Base Sequence; D012321:DNA-Directed RNA Polymerases / Q000096:biosynthesis* / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D009876:Operon; D011550:Pseudomonas aeruginosa / Q000235:genetics* / Q000254:growth & development; D012329:RNA, Bacterial / Q000096:biosynthesis / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D012808:Sigma Factor / Q000096:biosynthesis* / Q000235:genetics; D014158:Transcription, Genetic
D001426:Bacterial Proteins; D012329:RNA, Bacterial; D012333:RNA, Messenger; D012808:Sigma Factor; C069567:sigma factor KatF protein, Bacteria; C081775:RNA polymerase sigma 70; D012321:DNA-Directed RNA Polymerases