PMID- 7596415 OWN - NLM STAT- MEDLINE DCOM- 19950803 LR - 20111117 IS - 0028-0836 (Print) IS - 0028-0836 (Linking) VI - 375 IP - 6534 DP - 1995 Jun 29 TI - Mediation by HLA-DM of dissociation of peptides from HLA-DR. PG - 802-6 AB - Human leukocyte antigen (HLA)-DM is an unconventional major histocompatibility complex (MHC) class II heterodimer that is important for B-cell-mediated antigen processing and presentation to MHC class II-restricted T cells. HLA-DM is encoded by two genes, DMA and DMB, which map to the MHC class II region, and shares some homology with MHC class I and class II proteins. Here we define the biochemical role of HLA-DM. Recombinant soluble HLA-DM heterodimers have been purified from culture supernatants of insect cell transformants. At pH 5.0, they induce the dissociation of a subset of peptides bound to HLA-DR, including a nested set of class-II-associated invariant chain peptides (CLIP). This process liberates HLA-DR and leads to the enhanced binding of exogenous peptides. FAU - Sloan, V S AU - Sloan VS AD - Department of Autoimmune Disease Research, Merck Research Laboratories, Rahway, New Jersey 07065, USA. FAU - Cameron, P AU - Cameron P FAU - Porter, G AU - Porter G FAU - Gammon, M AU - Gammon M FAU - Amaya, M AU - Amaya M FAU - Mellins, E AU - Mellins E FAU - Zaller, D M AU - Zaller DM LA - eng PT - Journal Article PT - Research Support, U.S. Gov't, P.H.S. PL - England TA - Nature JT - Nature JID - 0410462 RN - 0 (Antigens, Differentiation, B-Lymphocyte) RN - 0 (H2-M antigens) RN - 0 (HLA-D Antigens) RN - 0 (HLA-DM antigens) RN - 0 (HLA-DR Antigens) RN - 0 (Histocompatibility Antigens Class II) RN - 0 (Oligopeptides) RN - 0 (invariant chain) SB - IM MH - Amino Acid Sequence MH - Animals MH - *Antigens, Differentiation, B-Lymphocyte MH - B-Lymphocytes/*immunology MH - Cell Line MH - Drosophila MH - HLA-D Antigens/*physiology MH - HLA-DR Antigens/chemistry/*metabolism MH - Histocompatibility Antigens Class II/metabolism MH - Humans MH - Hydrogen-Ion Concentration MH - Molecular Sequence Data MH - Oligopeptides/*metabolism MH - Protein Conformation MH - Transformation, Genetic EDAT- 1995/06/29 00:00 MHDA- 1995/06/29 00:01 CRDT- 1995/06/29 00:00 PHST- 1995/06/29 00:00 [pubmed] PHST- 1995/06/29 00:01 [medline] PHST- 1995/06/29 00:00 [entrez] AID - 10.1038/375802a0 [doi] PST - ppublish SO - Nature. 1995 Jun 29;375(6534):802-6. doi: 10.1038/375802a0.