A family of Gram-negative bacterial outer membrane factors that function in the export of proteins, carbohydrates, drugs and heavy metals from Gram-negative bacteria

Ian T. Paulsen, Jay H. Park, Peter S. Choi, Milton H. Saier

Research output: Contribution to journalReview articlepeer-review

212 Citations (Scopus)

Abstract

Gram-negative bacteria have evolved transport complexes that export macromolecules and toxic substances across the two membranes of the cell envelope in a single energy coupled step. The process requires (1) a cytoplasmic membrane export system, (2) a membrane fusion protein (MFP), and (3) an outer membrane factor (OMF). Families comprising the former two constituents have been described previously. We here present an analysis of the phylogenetic and structural characteristics of the OMF family. Twenty-one members of this family have been identified, and based on available evidence, they function in conjunction with ABC, RND, MFS and/or other types of cytoplasmic transport systems. OMFs exhibit fairly uniform sizes (398-495 residues with two exceptions), and based on computational analyses, they may form β-barrel structures consisting of up to 16 β-strands. Phylogenetic analyses reveal that while the MFPs cluster in accordance with the type of cytoplasmic membrane transport systems with which they function, OMFs do not. We conclude that OMFs probably comprise a family of outer membrane porin-type proteins of uniform structure which did not coevolve with their cognate cytoplasmic membrane transport systems.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalFEMS Microbiology Letters
Volume156
Issue number1
DOIs
Publication statusPublished - 1 Nov 1997
Externally publishedYes

Keywords

  • Active export
  • Beta-barrel
  • Complex carbohydrate
  • Drug
  • Gram-negative bacteria
  • Heavy metal
  • Outer membrane
  • Protein
  • Transport

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