Analysis in vivo of GRP78-BiP/substrate interactions and their role in induction of the GRP78-BiP gene

Davis T.W. Ng*, Stephanie S. Watowich, Robert A. Lamb

*Corresponding author for this work

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

The endoplasmic reticulum (ER)-localized chaperone protein, GRP78-BiP, is involved in the folding and oligomerization of secreted and membrane proteins, including the simian virus 5 hemagglutinin-neuraminidase (HN) glycoprotein. To understand this interaction better, we have constructed a series of HN mutants in which specific portions of the extracytoplasmic domain have been deleted. Analysis of these mutant polypeptides expressed in CV-1 cells have indicated that GRP78-BiP binds to selective sequences in HN and that there exists more than a single site of interaction. Mutant polypeptides have been characterized that are competent and incompetent for association with GRP78-BiP. These mutants have been used to show that the induction of GRP78-BiP synthesis due to the presence of nonnative protein molecules in the ER is dependent on GRP78-BiP complex formation with its substrates. These studies have implications for the function of the GRP78-BiP protein and the mechanism by which the gene is regulated.

Original languageEnglish (US)
Pages (from-to)143-155
Number of pages13
JournalMolecular biology of the cell
Volume3
Issue number2
DOIs
StatePublished - 1992

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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