ace, Which encodes an adhesin in Enterococcus faecalis, is regulated by Ers and is involved in virulence.
Enterococcus faecalis is an opportunistic pathogen that causes numerous infectious diseases in humans and is a major agent of nosocomial infections. In this work, we showed that the recently identified transcriptional regulator Ers (PrfA like), known to be involved in the cellular metabolism and the virulence of E. faecalis, acts as a repressor of ace, which encodes a collagen-binding protein. We characterized the promoter region of ace, and transcriptional analysis by reverse transcription-quantitative PCR and mobility shift protein-DNA binding assays revealed that Ers directly regulates the expression of ace. Transcription of ace appeared to be induced by the presence of bile salts, probably via the deregulation of ers. Moreover, with an ace deletion mutant and the complemented strain and by using an insect (Galleria mellonella) virulence model, as well as in vivo-in vitro murine macrophage models, we demonstrated for the first time that Ace can be considered a virulence factor for E. faecalis. Furthermore, animal experiments revealed that Ace is also involved in urinary tract infection by E. faecalis.
Lebreton
Francois
F
Laboratoire de Microbiologie de l'Environnement, Université de Caen, Caen Cedex, France.
Riboulet-Bisson
Eliette
E
Serror
Pascale
P
Sanguinetti
Maurizio
M
Posteraro
Brunella
B
Torelli
Riccardo
R
Hartke
Axel
A
Auffray
Yanick
Y
Giard
Jean-Christophe
JC
D000818:Animals; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D001647:Bile Acids and Salts / Q000378:metabolism; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000235:genetics; D002478:Cells, Cultured; D015169:Colony Count, Microbial; D013293:Enterococcus faecalis / Q000472:pathogenicity* / Q000502:physiology; D005260:Female; D017353:Gene Deletion; D020869:Gene Expression Profiling; D015964:Gene Expression Regulation, Bacterial; D005816:Genetic Complementation Test; D007668:Kidney / Q000382:microbiology; D007915:Lepidoptera / Q000382:microbiology; D008264:Macrophages / Q000382:microbiology; D051379:Mice; D008807:Mice, Inbred BALB C / Q000382:microbiology; D012097:Repressor Proteins / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*; D014774:Virulence
C121675:Ace protein, Enterococcus; D001426:Bacterial Proteins; D001647:Bile Acids and Salts; D002352:Carrier Proteins; D012097:Repressor Proteins; D014157:Transcription Factors