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- W2000228933 abstract "GRP94, the endoplasmic reticulum Hsp90 paralog, binds a diverse array of peptides, a subset of which are suitable for assembly onto nascent MHC class I molecules. At present, the mechanism, site, and regulation of peptide binding to GRP94 are unknown. Using VSV8, the immunodominant peptide epitope of the vesicular stomatitis virus, and native, purified GRP94, we have investigated GRP94−peptide complex formation. The formation of stable GRP94−VSV8 complexes was slow; competition studies demonstrated that peptide binding to GRP94 was specific. VSV8 binding to GRP94 was stimulated 2-fold or 4-fold, respectively, following chemical denaturation/renaturation or transient heat shock. The activation of GRP94−peptide binding occurred coincident with a stable, tertiary conformational change, as identified by tryptophan fluorescence and proteolysis studies. Analysis of GRP94 secondary structure by circular dichroism spectroscopy indicated an identical α-helical content for the native, chemically denatured/renatured, and heat-shocked forms of GRP94. Through use of the environment-sensitive fluorophores acrylodan and Nile Red, it was observed that the activation of peptide binding was accompanied by enhanced peptide and solvent accessibility to a hydrophobic binding site(s). Peptide binding to native or activated GRP94 was identical in the presence or absence of ATP or ADP. These results are discussed with respect to a model in which peptide binding to GRP94 occurs within a hydrophobic binding pocket whose accessibility is conformationally regulated in an adenine nucleotide-independent manner." @default.
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- W2000228933 date "1998-04-03" @default.
- W2000228933 modified "2023-09-27" @default.
- W2000228933 title "Structural Transitions Accompanying the Activation of Peptide Binding to the Endoplasmic Reticulum Hsp90 Chaperone GRP94" @default.
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- W2000228933 doi "https://doi.org/10.1021/bi9801006" @default.
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