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Sequential coupling between COPII and COPI vesicle coats in endoplasmic-reticulum to Golgi transport

Academic Article
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Overview

authors

  • Aridor, M.
  • Bannykh, S. I.
  • Rowe, T.
  • Balch, William E.

publication date

  • 1995

journal

  • Journal of Cell Biology  Journal

abstract

  • COPI and COPII are vesicle coat complexes whose assembly is regulated by the ARF1 and Sar1 GTPases, respectively. We show that COPI and COPII coat complexes are recruited separately and independently to ER (COPII), pre-Golgi (COPI, COPII), and Golgi (COPI) membranes of mammalian cells. To address their individual roles in ER to Golgi transport, we used stage specific in vitro transport assays to synchronize movement of cargo to and from pre-Golgi intermediates, and GDP- and GTP-restricted forms of Sar1 and ARF1 proteins to control coat recruitment. We find that COPII is solely responsible for export from the ER, is lost rapidly following vesicle budding and mediates a vesicular step required for the build-up of pre-Golgi intermediates composed of clusters of vesicles and small tubular elements. COPI is recruited onto pre-Golgi intermediates where it initiates segregation of the anterograde transported protein vesicular stomatitis virus glycoprotein (VSV-G) from the retrograde transported protein p58, a protein which actively recycles between the ER and pre-Golgi intermediates. We propose that sequential coupling between COPII and COPI coats is essential to coordinate and direct bi-directional vesicular traffic between the ER and pre-Golgi intermediates involved in transport of protein to the Golgi complex.

subject areas

  • ADP-Ribosylation Factor 1
  • ADP-Ribosylation Factors
  • Animals
  • Calcium
  • Carrier Proteins
  • Cells, Cultured
  • Coated Vesicles
  • Coatomer Protein
  • Endoplasmic Reticulum
  • GTP-Binding Proteins
  • Golgi Apparatus
  • Intracellular Membranes
  • Kidney
  • Membrane Proteins
  • Microsomes
  • Monomeric GTP-Binding Proteins
  • Plasmids
  • Rats
  • Receptors, Cytoplasmic and Nuclear
  • Saccharomyces cerevisiae Proteins
  • Temperature
  • Vesicular Transport Proteins
  • Vesicular stomatitis Indiana virus
  • Viral Proteins
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Identity

International Standard Serial Number (ISSN)

  • 0021-9525

Digital Object Identifier (DOI)

  • 10.1083/jcb.131.4.875

PubMed ID

  • 7490291
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Additional Document Info

start page

  • 875

end page

  • 893

volume

  • 131

issue

  • 4

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