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Mol Cell Biol. 1988 October; 8(10): 4250-4256

Identity of the immunoglobulin heavy-chain-binding protein with the 78,000-dalton glucose-regulated protein and the role of posttranslational modifications in its binding function.

Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38101.

ABSTRACT

The 78,000-dalton glucose-regulated protein (GRP78) and the immunoglobulin heavy-chain-binding protein (BiP) were shown to be the same protein by NH2-terminal sequence comparison. Immunoprecipitation of GRP78-BiP induced by glucose starvation and a temperature-sensitive mutation in a hamster fibroblast cell line demonstrated the association of GRP78-BiP with other cellular proteins. In both fibroblasts and lymphoid cells, GRP78-BiP was found to label with 32Pi and [3H]adenosine. Phosphoamino acid analysis demonstrated that GRP78-BiP is phosphorylated on serine and threonine residues. Conditions which induce increased production of GRP78-BiP resulted in decreased incorporation of 32Pi and [3H]adenosine into GRP78-BiP. Furthermore, we report here that the phosphorylated form of BiP resides in the endoplasmic reticulum and that BiP which is associated with heavy chains is not phosphorylated or labeled with [3H]adenosine, whereas free BiP is. This suggests that posttranslational modifications may be important in regulating the synthesis and binding of BiP.

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