Conserved regulatory elements of the promoter sequence of the gene rpoH of enteric bacteria.
The rpoH regulatory region of different members of the enteric bacteria family was sequenced or downloaded from GenBank and compared. In addition, the transcriptional start sites of rpoH of Yersinia frederiksenii and Proteus mirabilis, two distant members of this family, were determined. Sequences similar to the sigma(70) promoters P1, P4 and P5, to the sigma(E) promoter P3 and to boxes DnaA1, DnaA2, cAMP receptor protein (CRP) boxes CRP1, CRP2 and box CytR present in Escherichia coli K12, were identified in sequences of closely related bacteria such as: E.coli, Shigella flexneri, Salmonella enterica serovar Typhimurium, Citrobacter freundii, Enterobacter cloacae and Klebsiella pneumoniae. In more distant bacteria, Y.frederiksenii and P.mirabilis, the rpoH regulatory region has a distal P1-like sigma(70) promoter and two proximal promoters: a heat-induced sigma(E)-like promoter and a sigma(70) promoter. Sequences similar to the regulatory boxes were not identified in these bacteria. This study suggests that the general pattern of transcription of the rpoH gene in enteric bacteria includes a distal sigma(70) promoter, >200 nt upstream of the initiation codon, and two proximal promoters: a heat-induced sigma(E)-like promoter and a sigma(70) promoter. A second proximal sigma(70) promoter under catabolite-regulation is probably present only in bacteria closely related to E.coli.
Ramírez-Santos
J
J
Departamento de Biología Molecular, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, PO Box 70-228, 04510 México, D. F., México.
Collado-Vides
J
J
García-Varela
M
M
Gómez-Eichelmann
M C
MC
D001482:Base Composition; D001483:Base Sequence; D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial / Q000235:genetics; D017124:Conserved Sequence / Q000235:genetics*; D004755:Enterobacteriaceae / Q000235:genetics*; D005798:Genes, Bacterial / Q000235:genetics*; D006360:Heat-Shock Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D011401:Promoter Regions, Genetic / Q000235:genetics*; D011513:Proteus mirabilis / Q000235:genetics; D012045:Regulatory Sequences, Nucleic Acid / Q000235:genetics*; D012689:Sequence Homology, Nucleic Acid; D012808:Sigma Factor; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic; D015007:Yersinia / Q000235:genetics
D006360:Heat-Shock Proteins; D012808:Sigma Factor; D014157:Transcription Factors; C069774:heat-shock sigma factor 32