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- W952001987 abstract "The peptide binding site of MHC class II molecules is open at both ends and, therefore, does not restrict the length of the bound ligand. Here we show that a partially folded protein antigen (*HEL) spontaneously formed SDS-unstable complexes with the purified MHC class II molecule I-Ak (Ak). These complexes were also detected on the surface of antigen-presenting cells (APCs) where they stimulated T cells. However, they rapidly disappeared after endocytosis. Intracellular processing of *HEL gave rise to SDS-stable, long-lived Ak complexes containing *HEL peptides and, unexpectedly, full-length *HEL. Both SDS-stable products were formed in low pH compartments and then transported to the plasma membrane. In contrast to *HEL peptides, the stable association of *HEL occurred in an alternative pathway that required mature class II molecules and did not involve HLA-DM or proteases. SDS-stable *HEL-Ak complexes were formed by a reaction of endosomal Ak with endocytosed *HEL, but not by direct conversion of SDS-unstable complexes derived from the plasma membrane. Our work establishes a fundamental difference between the two MHC class II loading pathways and for the first time demonstrates a full-length protein as a product of antigen processing." @default.
- W952001987 created "2016-06-24" @default.
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- W952001987 date "1996-12-01" @default.
- W952001987 modified "2023-10-14" @default.
- W952001987 title "Distinct antigen MHC class II complexes generated by separate processing pathways." @default.
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- W952001987 doi "https://doi.org/10.1002/j.1460-2075.1996.tb01083.x" @default.
- W952001987 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/452517" @default.
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