Positive transcriptional feedback at the bvg locus controls expression of virulence factors in Bordetella pertussis.
Regulation of the genes coding for virulence factors in Bordetella pertussis is controlled by the bvg locus, which encodes one putative sensory protein (BvgS) and one positive regulator of transcription (BvgA). We have studied the transcription of the bvg locus and found that this is controlled by a 350-base-pair DNA fragment, which contains five promoters, three of which transcribe the bvg locus, one transcribes an antisense RNA, and one transcribes a virulence-associated gene. Under noninducing conditions, only the promoter P2 is active and this is responsible for the production of low amounts of regulatory proteins. Upon induction, the other four promoters become active and, by a mechanism that may involve transcriptional and translational regulation, cause a 50-fold increase of the transcriptional activator BvgA. A model of the autoregulation of the bvg locus is presented.
Sclavo Research Center, Siena, Italy.
V
V
Scarlato
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A
Prugnola
B
B
Aricó
R
R
Rappuoli
D001426:Bacterial Proteins; D001483:Base Sequence; D001886:Bordetella pertussis / Q000235:genetics* / Q000472:pathogenicity; D005246:Feedback; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D005809:Genes, Regulator; D008957:Models, Genetic; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D010957:Plasmids; D011401:Promoter Regions, Genetic; D012329:RNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D012333:RNA, Messenger / Q000235:genetics / Q000302:isolation & purification; D015183:Restriction Mapping; D014157:Transcription Factors / Q000235:genetics* / Q000302:isolation & purification; D014158:Transcription, Genetic; D014774:Virulence / Q000235:genetics
D001426:Bacterial Proteins; C065601:BvgA protein, Bacteria; D015345:Oligonucleotide Probes; D012329:RNA, Bacterial; D012333:RNA, Messenger; D014157:Transcription Factors