Tetratricopeptide repeat protein-associated proteins contribute to the virulence of Porphyromonas gingivalis

Yoshio Kondo, Naoya Ohara, Keiko Sato, Mamiko Yoshimura, Hideharu Yukitake, Mariko Naito, Taku Fujiwara, Koji Nakayama

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Porphyromonas gingivalis is one of the most etiologically important microorganisms in periodontal disease. We found in a previous study that PG1385 (TprA) protein, a tetratricopeptide repeat (TPR) protein, was upregulated in P. gingivalis wild-type cells placed in a mouse subcutaneous chamber and that a tprA mutant was clearly less virulent in the mouse subcutaneous abscess model (M. Yoshimura et al., Oral Microbiol. Immunol. 23:413-418, 2008). In the present study, we investigated the gene expression profile of tprA mutant cells placed in a mouse subcutaneous chamber and found that 9 genes, including PG2102 (tapA), PG2101 (tapB), and PG2100 (tapC) genes, were downregulated in the tprA mutant compared with those in the wild type. Expression of a cluster of tapA, tapB, and tapC genes of the mutant was also downregulated in an in vitro culture with enriched brain heart infusion medium. The TprA protein has three TPR motifs known as a protein-protein interaction module. Yeast two-hybrid system analysis and in vitro protein binding assays with immunoprecipitation and surface plasmon resonance detection revealed that the TprA protein could bind to TapA and TapB proteins. TprA and TapB proteins were located in the periplasmic space, whereas TapA, which appeared to be one of the C-terminal domain family proteins, was located at the outer membrane. We constructed tapA, tapB, and tapC single mutants and a tapA-tapB-tapC deletion mutant. In the mouse subcutaneous infection experiment, all of the mutants were less virulent than the wild type. These results suggest that TprA, TapA, TapB, and TapC are cooperatively involved in P. gingivalis virulence.

Original languageEnglish
Pages (from-to)2846-2856
Number of pages11
JournalInfection and Immunity
Volume78
Issue number6
DOIs
Publication statusPublished - Jun 1 2010

    Fingerprint

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Infectious Diseases

Cite this

Kondo, Y., Ohara, N., Sato, K., Yoshimura, M., Yukitake, H., Naito, M., Fujiwara, T., & Nakayama, K. (2010). Tetratricopeptide repeat protein-associated proteins contribute to the virulence of Porphyromonas gingivalis. Infection and Immunity, 78(6), 2846-2856. https://doi.org/10.1128/IAI.01448-09