title: MHC class I expression in mice lacking the proteasome subunit LMP-7.
abstract: Proteasomes degrade endogenous proteins. Two subunits, LMP-2 and LMP-7, are encoded in a region of the major histocompatibility complex (MHC) that is critical for class I-restricted antigen presentation. Mice with a targeted deletion of the gene encoding LMP-7 have reduced levels of MHC class I cell-surface expression and present the endogenous antigen HY inefficiently; addition of peptides to splenocytes deficient in LMP-7 restores wild-type class I expression levels. This demonstrates the involvement of LMP-7 in the MHC class I presentation pathway and suggests that LMP-7 functions as an integral part of the peptide supply machinery.
authors.affiliation: Basel Institute for Immunology, Switzerland.
authors.forename: H J
authors.initials: HJ
authors.lastname: Fehling
authors.forename: W
authors.initials: W
authors.lastname: Swat
authors.forename: C
authors.initials: C
authors.lastname: Laplace
authors.forename: R
authors.initials: R
authors.lastname: Kühn
authors.forename: K
authors.initials: K
authors.lastname: Rajewsky
authors.forename: U
authors.initials: U
authors.lastname: Müller
authors.forename: H
authors.initials: H
authors.lastname: von Boehmer
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; D000595:Amino Acid Sequence; D000818:Animals; D017951:Antigen Presentation; D000938:Antigen-Presenting Cells / Q000276:immunology; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics; D003546:Cysteine Endopeptidases; D005260:Female; D017353:Gene Deletion; D006183:H-2 Antigens / Q000096:biosynthesis* / Q000276:immunology; D006182:H-Y Antigen / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology; D008297:Male; D051379:Mice; D018345:Mice, Knockout; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes; D046988:Proteasome Endopeptidase Complex; D011506:Proteins / Q000235:genetics / Q000502:physiology*
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; D002352:Carrier Proteins; D006183:H-2 Antigens; D006182:H-Y Antigen; D009097:Multienzyme Complexes; D011506:Proteins; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; C489516:Tap2 protein, mouse; C071692:TAP2 protein, human; D003546:Cysteine Endopeptidases; C077436:LMP7 protein; D046988:Proteasome Endopeptidase Complex