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Kim, AeRyon; Ishizuka, Isabel Emiko; Hartman, Isamu Z; Poluektov, Yuri; Narayan, Kedar; Sadegh-Nasseri, Scheherazade
Methods in molecular biology (Clifton, N.J.), 01/2019, Volume: 1988Journal Article
HLA-DM is now known to have a major contribution to the selection of immunodominant epitopes. A better understanding of the mechanisms controlling epitope selection can be achieved by examination of the biophysical behavior of MHC class II molecules upon binding of antigenic peptides and of the effect of DM on the interactions. Using purified soluble molecules, in this chapter we describe several in vitro methods for measuring peptide binding to HLA-DR molecules and the effects of HLA-DM on this interaction. A simple qualitative method, Gentle SDS-PAGE Assay assesses the ability of peptides to form tight complexes with MHC class II molecules. Measuring binding kinetics is among the most informative approaches to understanding molecular mechanisms, and here we describe two different methods for measuring binding kinetics of peptide-MHC complexes. In one method, rates of association and dissociation of fluorescently labeled peptides to soluble MHC class II molecules can be determined using G50 spin columns to separate unbound peptides from those in complex with MHC molecules. In another method, association and dissociation of unlabeled peptides and MHC class II molecules can be determined in real time using BIAcore Surface Plasmon Resonance (SPR). We also describe an intrinsic tryptophan fluorescence assay for studying transient interactions of DM and MHC class II molecules.
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