Identification of microsporidia host-exposed proteins reveals a repertoire of rapidly evolving proteins

Nat Commun. 2017 Jan 9;8:14023. doi: 10.1038/ncomms14023.

Abstract

Pathogens use a variety of secreted and surface proteins to interact with and manipulate their hosts, but a systematic approach for identifying such proteins has been lacking. To identify these 'host-exposed' proteins, we used spatially restricted enzymatic tagging followed by mass spectrometry analysis of Caenorhabditis elegans infected with two species of Nematocida microsporidia. We identified 82 microsporidia proteins inside of intestinal cells, including several pathogen proteins in the nucleus. These microsporidia proteins are enriched in targeting signals, are rapidly evolving and belong to large Nematocida-specific gene families. We also find that large, species-specific families are common throughout microsporidia species. Our data suggest that the use of a large number of rapidly evolving species-specific proteins represents a common strategy for microsporidia to interact with their hosts. The unbiased method described here for identifying potential pathogen effectors represents a powerful approach to study a broad range of pathogens.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Caenorhabditis elegans / genetics
  • Caenorhabditis elegans / metabolism
  • Caenorhabditis elegans / microbiology*
  • Caenorhabditis elegans Proteins / genetics
  • Caenorhabditis elegans Proteins / metabolism
  • Cell Nucleus / metabolism
  • Cell Nucleus / microbiology
  • Epithelial Cells / metabolism*
  • Epithelial Cells / microbiology
  • Fungal Proteins / genetics*
  • Fungal Proteins / metabolism
  • Gene Expression Profiling
  • Gene Expression Regulation
  • Host-Pathogen Interactions*
  • Intestinal Mucosa / metabolism
  • Intestines / microbiology
  • Microsporidia / classification
  • Microsporidia / genetics*
  • Microsporidia / metabolism
  • Phylogeny
  • Sodium Channels / genetics
  • Sodium Channels / metabolism

Substances

  • Caenorhabditis elegans Proteins
  • Fungal Proteins
  • Sodium Channels
  • apx-1 protein, C elegans