The incongruent gelatinase genotype and phenotype in Enterococcus faecalis are due to shutting off the ability to respond to the gelatinase biosynthesis-activating pheromone (GBAP) quorum-sensing signal

Neuza Teixeira, Sofia Santos, Paulo Marujo, Ryoji Yokohata, Vijayalakshmi S. Iyer, Jiro Nakayama, Lynn E. Hancock, Pascale Serror, Maria de Fátima Silva Lopes Lopes

Research output: Contribution to journalArticle

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Abstract

The concomitant presence of a complete fsr quorum-sensing system and gelE-sprE operons in Enterococcus faecalis is known to be essential for the detection of gelatinase activity. However, there are reports of the absence of gelatinase activity despite the presence of complete fsr and gelE loci. In order to understand this incongruence between genotype and phenotype we sequenced fsr and gelE loci of the E. faecalis LN68 strain, which was previously found to carry both operons but to lack gelatinase activity. Of the 59 nucleotide differences detected compared with the gelatinase-positive V583 strain, we found a nonsense mutation (a premature STOP codon) predicted to truncate the ATPase sensor domain of the FsrC protein, responsible for sensing and transducing the signal from the quorum-sensing molecule. Strain LN68 was highly affected in the expression of the gelE and sprE genes, further supporting the lack of Fsrdependent gelE induction. When we constructed a V583 mutant with the same premature stop mutation in the fsrC gene the resulting strain was no longer able to degrade gelatin. We conclude that the reduced ability to transduce the quorum-sensing signal of the prematurely truncated FsrC protein is sufficient to explain the negative gelatinase phenotype. As the incongruent genotype and phenotype is detected in natural isolates, we believe that the silencing of the quorum-sensing system Fsr may be beneficial for some E. faecalis strains.

Original languageEnglish
Pages (from-to)519-528
Number of pages10
JournalMicrobiology
Volume158
Issue number2
DOIs
Publication statusPublished - Feb 1 2012

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Quorum Sensing
Gelatinases
Enterococcus faecalis
Genotype
Phenotype
Operon
Nonsense Codon
Gelatin
Codon
Genes
Adenosine Triphosphatases
Nucleotides
gelatinase biosynthesis-activating pheromone
Mutation
Proteins

All Science Journal Classification (ASJC) codes

  • Microbiology

Cite this

The incongruent gelatinase genotype and phenotype in Enterococcus faecalis are due to shutting off the ability to respond to the gelatinase biosynthesis-activating pheromone (GBAP) quorum-sensing signal. / Teixeira, Neuza; Santos, Sofia; Marujo, Paulo; Yokohata, Ryoji; Iyer, Vijayalakshmi S.; Nakayama, Jiro; Hancock, Lynn E.; Serror, Pascale; Lopes, Maria de Fátima Silva Lopes.

In: Microbiology, Vol. 158, No. 2, 01.02.2012, p. 519-528.

Research output: Contribution to journalArticle

Teixeira, Neuza ; Santos, Sofia ; Marujo, Paulo ; Yokohata, Ryoji ; Iyer, Vijayalakshmi S. ; Nakayama, Jiro ; Hancock, Lynn E. ; Serror, Pascale ; Lopes, Maria de Fátima Silva Lopes. / The incongruent gelatinase genotype and phenotype in Enterococcus faecalis are due to shutting off the ability to respond to the gelatinase biosynthesis-activating pheromone (GBAP) quorum-sensing signal. In: Microbiology. 2012 ; Vol. 158, No. 2. pp. 519-528.
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