ArticlePLoS genetics2024
The HtrA chaperone monitors sortase-assembled pilus biogenesis in Enterococcus faecalis.
Article in PLoS genetics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed.
- A two-component system signaling hub controls enterococcal membrane remodeling in response to daptomycin.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- The gram-positive HtrA, the protease that is also a chaperone.Journal of bacteriology · 2026Review
- Loss of Fsr quorum sensing promotes biofilm formation and worsens outcomes in enterococcal infective endocarditis.Nature communications · 2026Article
- Streptococcus pneumoniae HtrA is a dynamic and monomeric virulence factor capable of forming larger oligomeric complexes.Protein science : a publication of the Protein Society · 2026Article
- Comparative metagenomics using pan-metagenomic graphs.bioRxiv : the preprint server for biology · 2025Article
- Insights into ecology, pathogenesis, and biofilm formation ofMicrobiology and molecular biology reviews : MMBR · 2025Review
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Authors and funding
10 authors.
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No grant is acknowledged in the PubMed record.
Abstract
Sortase-assembled pili contribute to virulence in many Gram-positive bacteria. In Enterococcus faecalis, the endocarditis and biofilm-associated pilus (Ebp) is polymerized on the membrane by sortase C (SrtC) and attached to the cell wall by sortase A (SrtA). In the absence of SrtA, polymerized pili remain anchored to the membrane (i.e. off-pathway). Here we show that the high temperature requirement A (HtrA) bifunctional chaperone/protease of E. faecalis is a quality control system that clears aberrant off-pathway pili from the cell membrane. In the absence of HtrA and SrtA, accumulation of membrane-bound pili leads to cell envelope stress and partially induces the regulon of the ceftriaxone resistance-associated CroRS two-component system, which in turn causes hyper-piliation and cell morphology alterations. Inactivation of croR in the OG1RF ΔsrtAΔhtrA background partially restores the observed defects of the ΔsrtAΔhtrA strain, supporting a role for CroRS in the response to membrane perturbations. Moreover, absence of SrtA and HtrA decreases basal resistance of E. faecalis against cephalosporins and daptomycin. The link between HtrA, pilus biogenesis and the CroRS two-component system provides new insights into the E. faecalis response to endogenous membrane perturbations.
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