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Biochim Biophys Acta. 2008 Nov;1782(11):615-20. doi: 10.1016/j.bbadis.2008.08.004. Epub 2008 Aug 22.

Human cellular prion protein interacts directly with clusterin protein.

Author information

1
Division of Hematology, Office of Blood Research and Review, Center for Biologics Evaluation and Research, United States Food and Drug Administration, Bethesda, MD, USA.

Abstract

Prion protein is a glycosyl-phosphatidyl-inositol anchored glycoprotein localized on the surface and within a variety of cells. Its conformation change is thought to be essential for the proliferation of prion neurodegenerative diseases. Using the yeast two-hybrid assay we identified an interaction between prion protein and clusterin, a chaperone glycoprotein. This interaction was confirmed in a mammalian system by in vivo co-immunoprecipitation and in vitro by circular dichroism analysis. Through deletion mapping analysis we demonstrated that the alpha subunit, but not the beta subunit, of clusterin binds to prion and that the C-terminal 62 amino acid segment of the putative alpha helix region of clusterin is essential for the binding interaction. The full prion protein as well as the N-terminal section (aa 23-95) and C-terminal (aa 96-231) were shown to interact with clusterin. These findings provide new insights into the molecular mechanisms of interaction between prion and clusterin protein and contribute to the understanding of prion protein's physiological function.

PMID:
18786636
DOI:
10.1016/j.bbadis.2008.08.004
[Indexed for MEDLINE]
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