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Related Experiment Videos

A comparative genome analysis identifies distinct sorting pathways in gram-positive bacteria.

David Comfort1, Robert T Clubb

  • 1Department of Chemistry and Biochemistry, Molecular Biology Institute, and the UCLA-DOE Center for Genomics and Proteomics, University of California, Los Angeles, California 90095-1570, USA.

Infection and Immunity
|April 23, 2004
PubMed
Summary

Gram-positive bacteria use sortase enzymes to anchor surface proteins essential for virulence. This study reveals five sortase subfamilies and predicts their nonredundant roles in protein sorting across bacterial species.

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Area of Science:

  • Microbiology
  • Bacterial Cell Biology
  • Genomics

Background:

  • Surface proteins are crucial for gram-positive bacterial virulence.
  • Sortase enzymes anchor these proteins to the cell wall via an LPXTG signal.
  • Bacteria often possess multiple sortase enzymes and numerous substrates.

Purpose of the Study:

  • To elucidate the sorting pathways in gram-positive bacteria.
  • To analyze the diversity and function of sortase enzymes and their substrates.
  • To predict functional sortase-substrate linkages.

Main Methods:

  • Comparative analysis of 72 microbial genomes.
  • Bioinformatic prediction of sortase subfamilies and substrate motifs.
  • Database construction for sortase-substrate linkage predictions.

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Main Results:

  • Sortase enzymes were classified into five distinct subfamilies based on sequence.
  • Most bacteria encode sortases from multiple subfamilies, suggesting nonredundant functions.
  • Proteins related to Staphylococcus aureus SrtA anchor the majority of surface proteins, while other sortase-like proteins have specialized roles.

Conclusions:

  • Sortase enzymes exhibit subfamily-specific functions in anchoring bacterial surface proteins.
  • Understanding sortase-substrate interactions is key to deciphering bacterial cell surface architecture and virulence.
  • A searchable database provides predictions for sortase-substrate linkages.