Beta-COP is essential for biosynthetic membrane transport from the endoplasmic reticulum to the Golgi complex in vivo

Cell. 1993 Jul 16;74(1):71-82. doi: 10.1016/0092-8674(93)90295-2.


Microinjection of antibodies against a synthetic peptide of a non-clathrin-coated vesicle-associated coat protein, beta-COP, blocks transport of a temperature-sensitive vesicular stomatitis virus glycoprotein (ts-O45-G) to the cell surface. Transport is inhibited upon release of the viral glycoprotein from temperature blocks at 39.5 degrees C (endoplasmic reticulum [ER]) and 15 degrees C (intermediate compartment), but not at 20 degrees C (trans-Golgi network). Ts-O45-G is arrested in tubular membrane structures containing p53 at the interface of the ER and the Golgi stack. This is consistent with inhibition of acquisition of endoglycosidase H resistance of ts-O45-G in injected cells. Secretion of endogenous proteins and maturation of cathepsin D are also inhibited. These data provide in vivo evidence that beta-COP has an important function in biosynthetic membrane traffic in mammalian cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies / pharmacology
  • Biological Transport / drug effects
  • Cathepsin D / metabolism
  • Coatomer Protein
  • Endoplasmic Reticulum / metabolism*
  • Golgi Apparatus / metabolism*
  • Intracellular Membranes / metabolism*
  • Microinjections
  • Microtubule-Associated Proteins / physiology*
  • Temperature
  • Vero Cells / metabolism
  • Viral Proteins / metabolism


  • Antibodies
  • Coatomer Protein
  • Microtubule-Associated Proteins
  • Viral Proteins
  • Cathepsin D