The low-molecular-mass, penicillin-binding proteins DacB and DacC combine to modify peptidoglycan cross-linking and allow stable Type IV pilus expression in Neisseria gonorrhoeae

Kyle P. Obergfell, Ryan E. Schaub, Lauren L. Priniski, Joseph P. Dillard, H. Steven Seifert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Neisseria gonorrhoeae is the causative agent of the sexually transmitted infection gonorrhea and is adapted to survive in humans, its only host. The N. gonorrhoeae cell wall is critical for maintaining envelope integrity, resisting immune cell killing and production of cytotoxic peptidoglycan (PG) fragments. Deletion of the N. gonorrhoeae strain FA1090 genes encoding two predicted low-molecular-mass, penicillin-binding proteins (LMM PBPs), DacB and DacC, substantially altered the PG cross-linking. Loss of the DacB peptidase resulted in global alterations to the PG composition, while loss of the DacC protein affected a much narrower subset of PG peptide components. A double ΔdacB/ΔdacC mutant resembled the ΔdacB single mutant, but had an even greater level of cross-linked PG. While single ΔdacB or ΔdacC mutants did not show any major phenotypes, the ΔdacB/ΔdacC mutant displayed an altered cellular morphology, decreased resistance to antibiotics and increased sensitivity to detergent-mediated death. Loss of the two proteins also drastically reduced the number of Type IV pili (Tfp), a critical virulence factor. The decreased piliation reduced transformation efficiency and correlated with increased growth rate. While these two LMM PBPs differentially alter the PG composition, their overlapping effects are essential to proper envelope function and expression of factors critical for pathogenesis.

Original languageEnglish (US)
Pages (from-to)135-149
Number of pages15
JournalMolecular Microbiology
Volume109
Issue number2
DOIs
StatePublished - Jul 2018

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

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