Invariant-cognate peptide exchange restores class II dimer stability in HLA-DM mutants.

Abstract excerpt

Class II presentation mutants have mutations in the HLA-DMA or B genes and are defective in the presentation of whole exogenous Ags restricted by HLA-DR, -DQ, and -DP. The functional defect in Ag presentation is accompanied by an altered conformation of cell surface class II molecules and instability of extracted class II dimers in SDS-PAGE; the latter can be corrected by incubation of mutant cells in an acidic...

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