title: Processing and delivery of peptides presented by MHC class I molecules.
abstract: Effective MHC class I peptide loading requires the proteolytic degradation of cytosolic proteins and the TAP-mediated translocation of peptides across the membrane of the endoplasmic reticulum. The proteasome is emerging as the main cytosolic protease generating class I binding peptides. The recent elucidation of the proteasome crystal structure, together with the use of functional inhibitors, has enhanced our understanding of proteasome function. Genetic analysis of a novel mutant cell line emphasizes the importance of the TAP-class I interaction in the assembly of mature class I heterotrimers, and suggests that additional MHC-encoded components are required.
authors.affiliation: Section of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.
authors.forename: P J
authors.initials: PJ
authors.lastname: Lehner
authors.forename: P
authors.initials: P
authors.lastname: Cresswell
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D000818:Animals; D017951:Antigen Presentation; D003546:Cysteine Endopeptidases / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D003602:Cytotoxicity, Immunologic; D004721:Endoplasmic Reticulum / Q000378:metabolism; D000939:Epitopes / Q000276:immunology / Q000378:metabolism; D015395:Histocompatibility Antigens Class I / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D007371:Interferon-gamma / Q000276:immunology / Q000378:metabolism; D051379:Mice; D018345:Mice, Knockout; D008958:Models, Molecular; D009097:Multienzyme Complexes / Q000737:chemistry / Q000378:metabolism / Q000502:physiology; D046988:Proteasome Endopeptidase Complex
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters; D000939:Epitopes; D015395:Histocompatibility Antigens Class I; D009097:Multienzyme Complexes; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; C489516:Tap2 protein, mouse; C071692:TAP2 protein, human; D007371:Interferon-gamma; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex