Fast association rates suggest a conformational change in the MHC class I molecule H-2Db upon peptide binding.
Major histocompatibility complex (MHC) class I molecules bind peptides in the endoplasmic reticulum (ER). For this binding reaction, when performed in vitro, widely differing association rates have been reported. We have expressed empty soluble H-2Db class I molecules in Chinese hamster ovary (CHO) cells and generated complete sets of association, dissociation, and equilibrium constants of unmodified peptides using tritium-labeled peptides and stopped-flow fluorescence spectroscopy. We find t...Expand abstract
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