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The regulatory RNA gene micF is present in several species of Gram‐negative bacteria and is phylogenetically conserved
Author(s) -
Esterling Lisa,
Delihas Nicholas
Publication year - 1994
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.1994.tb01051.x
Subject(s) - biology , escherichia coli , rna , gene , genetics , conserved sequence , microbiology and biotechnology , peptide sequence
Summary micF RNA post‐transcriptionally regulates Escherichia coli outer membrane protein F (OmpF), in response to temperature increase and other environmental stress conditions, by binding to ompF mRNA and destabilizing the message. Southern analyses show that the micF gene is present in related Gram‐negative bacteria, including Salmonella typhimurium, Klebsiella pneumoniae , and Pseudomonas aeruginosa. In addition, Northern analyses Indicate that micF RNA and ompF mRNA levels are thermally regulated in several related species in a manner similar to the thermoregulation in Escherichia coli DNA sequences from Salmonella typhi, Salmonella typhimurium , and Klebsiella pneumoniae show greater than 96% homology in the micF gene when compared to the Escherichia coli micF sequence. Upstream of micF , sequences show considerable variation, although several distinct regions are highly conserved. Some of these conserved regions correspond to known binding sites for the transcription factor OmpR and the DNA‐binding protein integration host factor. In addition, E. coli micF RNA incubated with protein extracts from other species forms hetero‐logous ribonucleoproteins (RNPs). The formation of these heterologous RNPs indicates both the presence of micF RNA‐binding protein homologues in other species and a conservation of RNA‐protein recognition sites. This work demonstrates that the micF RNA regulatory system is present in other Gram‐negative bacterial species and that this system appears to be phylogenetically conserved.