To investigate the function of heavy chain binding protein (BiP, GRP 78) in the endoplasmic reticulum, we have characterized its interaction with a model plasma membrane glycoprotein, the G protein of vesicular stomatitis virus. We used a panel of well characterized mutant G proteins and immunoprecipitation with anti-BiP antibodies to determine if BiP interacted with newly synthesized G protein and/or mutant G proteins retained in the endoplasmic reticulum. We made three major observations: 1) BiP bound transiently to folding intermediates of wild-type G protein which were incompletely disulfide-bonded; 2) BiP did not bind stably to all mutant G proteins which remain in the endoplasmic reticulum; and 3) BiP bound stably only to mutant G proteins which do not form correct intrachain disulfide bonds.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of Biological Chemistry|
|State||Published - 1990|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology