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SecB, a molecular chaperone with two faces.

A J Driessen1

  • 1Dept of Microbiology, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Kerklaan 30, 9751 NN Haren, Groningen, The Netherlands. a.j.m.driessen@biol.rug.nl

Trends in Microbiology
|May 5, 2001
PubMed
Summary

SecB, a molecular chaperone in Proteobacteria, facilitates protein transport across cell membranes. Its structure reveals how it binds preproteins and SecA, with SecA

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Area of Science:

  • Microbiology
  • Structural Biology
  • Molecular Biology

Background:

  • SecB is a unique molecular chaperone found in Proteobacteria.
  • It plays a crucial role in the translocation of secretory proteins across the cytoplasmic membrane.
  • Proteobacteria are significant in medical, industrial, and agricultural fields.

Purpose of the Study:

  • To elucidate the structural basis of SecB's interaction with its ligands.
  • To understand how SecB simultaneously recognizes unfolded preproteins and SecA.
  • To define SecB's specific role in protein translocation.

Main Methods:

  • X-ray crystallography of Haemophilus influenzae SecB.
  • Structural analysis of SecB-ligand interactions.

Main Results:

  • The crystal structure of Haemophilus influenzae SecB was determined.
  • SecB utilizes its entire molecular surface to bind both unfolded preproteins and SecA.
  • SecA's catalytic activity is essential for the release of preproteins and SecB from the membrane.

Conclusions:

  • SecB functions as a translocation-specific molecular chaperone.
  • The interaction mechanism highlights the coordinated action of SecB and SecA in protein transport.
  • Structural insights advance understanding of bacterial protein secretion machinery.

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