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Invasion of Human Cells by a Bacterial Pathogen
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Published on: March 21, 2011

Surface interactome in Streptococcus pyogenes.

Cesira L Galeotti1, Elia Bove, Alfredo Pezzicoli

  • 1Novartis Vaccines, Via Fiorentina 1, 53100 Siena, Italy.

Molecular & Cellular Proteomics : MCP
|December 27, 2011
PubMed
Summary
This summary is machine-generated.

This study maps bacterial surface protein interactions in Streptococcus pyogenes, identifying 146 interactions. Key findings reveal how the superantigen SpeI acquires zinc for pathogenesis.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Limited research exists on bacterial surface and secreted protein interactions.
  • These interactions are crucial for bacterial biological functions and pathogenesis.
  • Streptococcus pyogenes (group A Streptococcus, GAS) is a significant human pathogen.

Purpose of the Study:

  • To systematically analyze protein-protein interactions of surface and secreted proteins in GAS.
  • To define the GAS
  • surface interactome
  • using protein array technology.

Main Methods:

  • Utilized high-density protein array technology to screen interactions among 83 GAS surface/secreted proteins.
  • Validated identified interactions using surface plasmon resonance and confocal microscopy.
  • Probed immobilized proteins for interactions with proteins in solution.

Main Results:

  • Identified 146 protein-protein interactions, with 25 classified as reciprocal.
  • Discovered interactions involving proteins like OppA, DppA, PrsA, TlpA, potentially part of the ExPortal complex.
  • Found that the superantigen SpeI interacts with metal transporters AdcA and Lmb, explaining zinc acquisition for pathogenesis.

Conclusions:

  • The protein array approach effectively maps bacterial surface interactomes.
  • Identified interactions provide insights into GAS cell envelope organization and virulence mechanisms.
  • Findings elucidate how GAS acquires essential metals like zinc for pathogenic functions.