Neisseria gonorrhoeae muts affects pilin antigenic variation through mismatch correction and not by pilE guanine quartet binding

Ella Rotman, H. Steven Seifert*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Many pathogens use homologous recombination to vary surface antigens to avoid immune surveillance. Neisseria gonorrhoeae achieves this in part by changing the properties of its surface pili in a process called pilin antigenic variation (AV). Pilin AV occurs by high-frequency gene conversion reactions that transfer silent pilS sequences into the expressed pilE locus and requires the formation of an upstream guanine quartet (G4) DNA structure to initiate this process. The MutS and MutL proteins of the mismatch correction (MMC) system act to correct mismatches after replication and prevent homeologous (i.e., partially homologous) recombination, but MutS orthologs can also bind to G4 structures. A previous study showed that mutation of MutS resulted in a 3-fold increase in pilin AV, which could be due to the loss of MutS antirecombination properties or loss of G4 binding. We tested two site-directed separation-of-function MutS mutants that are both predicted to bind to G4s but are not able to perform MMC. Pilus phase variation assays and DNA sequence analysis of pilE variants produced in these mutants showed that all three mutS mutants and a mutL mutant had similar increased frequencies of pilin AV. Moreover, the mutS mutants all showed similar increased levels of pilin AV-dependent synthetic lethality. These results show that antirecombination byMMCis the reason for the effect that MutS has on pilin AV and is not due to pilE G4 binding by MutS.

Original languageEnglish (US)
Pages (from-to)1828-1838
Number of pages11
JournalJournal of bacteriology
Volume197
Issue number10
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Fingerprint

Dive into the research topics of 'Neisseria gonorrhoeae muts affects pilin antigenic variation through mismatch correction and not by pilE guanine quartet binding'. Together they form a unique fingerprint.

Cite this