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Characterization of an outer membrane protein gene, pgmA, and its gene product from Porphyromonas gingivalis.

Authors
  • Hongo, H
  • Osano, E
  • Ozeki, M
  • Onoe, T
  • Watanabe, K
  • Honda, O
  • Tani, H
  • Nakamura, H
  • Yoshimura, F
Type
Published Article
Journal
Microbiology and immunology
Publication Date
Jan 01, 1999
Volume
43
Issue
10
Pages
937–946
Identifiers
PMID: 10585140
Source
Medline
License
Unknown

Abstract

A gene upstream from fimA, the gene encoding fimbrilin, on the chromosome of Porphyromonas gingivalis was sequenced and shown to be the gene encoding an outer membrane protein in this organism based on homology and biochemical analyses. Therefore, the gene (formerly ORF5) was designated pgmA, the P. gingivalis outer membrane protein A gene. The gene product, PgmA, was sensitive to protease, and was detected as a 60-kDa protein from wild-type strains with trichloroacetic acid treatment, which was carried out to destroy intrinsic proteases, and from protease-deficient mutants without this treatment prior to electrophoresis. PgmA was indeed present in the membrane fraction. Its nature was determined to be that of outer membrane proteins in gram-negative bacteria based on attempts at differential extraction of inner membrane proteins with detergents. No evidence has been found thus far from functional analyses that this protein is related to fimbrial morphogenesis and functions or to serum resistance of this organism.

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