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. 1992 Feb;12(2):784–790. doi: 10.1128/mcb.12.2.784

Interaction of Wnt-1 proteins with the binding protein BiP.

J Kitajewski 1, J O Mason 1, H E Varmus 1
PMCID: PMC364299  PMID: 1531088

Abstract

The mouse Wnt-1 gene, a target for insertional activation in mouse mammary tumor virus-induced mammary tumors, encodes poorly secreted, cysteine-rich glycoproteins required for proper central nervous system development. We have been analyzing the biosynthesis of Wnt-1 proteins in several cell lines that express Wnt-1 cDNA from heterologous promoters. A protein of 78 kDa was found to be associated with the intracellular forms of Wnt-1 proteins in mammalian and avian cells by using multiple antisera against Wnt-1 proteins. We have identified p78 as the binding protein BiP with anti-BiP antisera and by its release from Wnt-1 immunoprecipitates upon incubation with MgCl2 and ATP. Experiments with a Wnt-1 mutant that lacks the sequence encoding the signal peptide indicates that Wnt-1 proteins must enter the secretory pathway in order to interact with BiP. We demonstrate that Wnt-1 proteins are associated with BiP in cells in which active Wnt-1 proteins are produced, such as a cultured mammary epithelial cell line and Wnt-1 transgenic mouse mammary tumor cells. The association of Wnt-1 proteins with BiP may be a factor in determining the efficiency of secretion of Wnt-1 gene products.

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