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Protein translocation across the endoplasmic reticulum

D T Ng1, P Walter

  • 1Department of Biochemistry and Biophysics, University of California at San Francisco 94143-0448.

Current Opinion in Cell Biology
|August 1, 1994
PubMed
Summary

Recent advances reveal novel mechanisms in eukaryotic protein biogenesis, detailing protein targeting to the endoplasmic reticulum and translocation. Key findings include a new GTP-binding protein cycle regulating targeting and conserved evolutionary strategies for polypeptide processing.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Protein biogenesis is crucial for cellular function, particularly in the eukaryotic secretory pathway.
  • Understanding protein targeting and translocation is essential for deciphering cellular communication and function.

Purpose of the Study:

  • To elucidate the mechanisms of protein targeting to the endoplasmic reticulum membrane.
  • To investigate the translocation of nascent polypeptides across the endoplasmic reticulum membrane.
  • To explore the role of GTP-binding proteins in regulating protein targeting and translocation.

Main Methods:

  • Utilized fluorescent probes to visualize nascent chain entry into the membrane.
  • Employed in vitro reconstitution experiments with synthetic membranes.

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  • Conducted genetic and functional analyses across divergent organisms.

    • Main Results:

    • Identified a novel cycle of GTP binding and hydrolysis involving three GTP-binding proteins that regulates protein targeting.
    • Demonstrated that nascent polypeptide chains enter an aqueous environment within the membrane, distinct from the cytosol.
    • Showcased the efficiency of translocation and membrane protein integration using a minimal set of polypeptides in vitro.
    • Revealed conserved evolutionary strategies for polypeptide targeting and translocation.

    Conclusions:

    • Significant progress has been made in understanding the initial steps of eukaryotic protein biogenesis.
    • The study provides a refined view of protein targeting and translocation, highlighting key molecular players and mechanisms.
    • Evidence of evolutionary conservation underscores the fundamental importance of these processes across different organisms.