Document Detail

The Enterococcus faecalis sigV protein is an extracytoplasmic function sigma factor contributing to survival following heat, acid, and ethanol treatments.
MedLine Citation:
PMID:  15659680     Owner:  NLM     Status:  MEDLINE    
Analysis of the genome sequence of Enterococcus faecalis allowed the identification of two genes whose protein products showed 33 and 34% identity with those of sigV and yrhM of Bacillus subtilis, respectively. These genes, named sigV and rsiV, are predicted to encode members of the extracytoplasmic function subfamily of eubacterial RNA polymerase sigma and anti-sigma factors, respectively. This group of sigma factors has been shown to regulate gene expression in response to stress conditions. sigV and rsiV were shown to be under the control of the same promoter. The transcriptional start site was determined, and the 1.5-kb mRNA transcript was shown to be overexpressed under glucose and complete starvation, as well as under physicochemical treatments. Three mutants, affected in sigV, rsiV, and both genes, were constructed by double-crossover recombination within the genome of E. faecalis strain JH2-2. Compared with the wild type and the rsiV mutant, the sigV mutants were more susceptible to heat shock, acid, and ethanol treatments and displayed decreased survival during long-term starvation. A nisin-inducible sigV gene construction used in complementation assays restored the wild phenotype of the sigV mutants, confirming the involvement of SigV in the heat shock, ethanol, and acid stress responses. Northern blot analysis carried out with the three mutant strains revealed the inhibition of sigV expression by the related anti-sigma factor gene rsiV. In addition, putative candidates of the sigV regulon determined by computer search for the sigV promoter sequence were analyzed.
Abdellah Benachour; Cécile Muller; Monika Dabrowski-Coton; Yoann Le Breton; Jean-Christophe Giard; Alain Rincé; Yanick Auffray; Axel Hartke
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of bacteriology     Volume:  187     ISSN:  0021-9193     ISO Abbreviation:  J. Bacteriol.     Publication Date:  2005 Feb 
Date Detail:
Created Date:  2005-01-20     Completed Date:  2005-03-01     Revised Date:  2013-04-18    
Medline Journal Info:
Nlm Unique ID:  2985120R     Medline TA:  J Bacteriol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1022-35     Citation Subset:  IM    
Laboratoire de Microbiologie de l'Environnement, IRBA, Université de Caen, 14032 Caen Cedex, France.
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MeSH Terms
Amino Acid Sequence
Bacterial Proteins / genetics,  physiology*
Base Sequence
Codon, Terminator / genetics
DNA Primers
Enterococcus faecalis / cytology,  drug effects,  genetics,  physiology*
Ethanol / pharmacology*
Gene Expression Regulation, Bacterial
Genetic Complementation Test
Hydrogen-Ion Concentration
Molecular Sequence Data
Mutagenesis, Site-Directed
Polymerase Chain Reaction
RNA, Messenger / genetics
Restriction Mapping
Sequence Alignment
Sequence Homology, Amino Acid
Sigma Factor / genetics,  physiology*
Reg. No./Substance:
0/Bacterial Proteins; 0/Codon, Terminator; 0/DNA Primers; 0/RNA, Messenger; 0/SigV protein, Enterococcus faecalis; 0/Sigma Factor; 64-17-5/Ethanol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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