title: cDNA cloning and interferon gamma down-regulation of proteasomal subunits X and Y.
abstract: Proteasomes are the proteolytic complex responsible for major histocompatibility complex (MHC) class I-restricted antigen presentation. Interferon gamma treatment increases expression MHC-encoded LMP2 and LMP7 subunits of the proteasome and decreases expression of two proteasome subunits, named X and Y, which alters the proteolytic specificity of proteasomes. Molecular cloning of complementary DNAs encoding X and Y showed that their proteins are proteasomal subunits with high amino acid similarity to LMP7 and LMP2, respectively. Thus, interferon gamma may induce subunit replacements of X and Y by LMP7 and LMP2, respectively, producing proteasomes perhaps more appropriate for the immunological processing of endogenous antigens.
authors.affiliation: Department of Urology, School of Medicine, University of Tokushima, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Akiyama
authors.forename: K
authors.initials: K
authors.lastname: Yokota
authors.forename: S
authors.initials: S
authors.lastname: Kagawa
authors.forename: N
authors.initials: N
authors.lastname: Shimbara
authors.forename: T
authors.initials: T
authors.lastname: Tamura
authors.forename: H
authors.initials: H
authors.lastname: Akioka
authors.forename: H G
authors.initials: HG
authors.lastname: Nothwang
authors.forename: C
authors.initials: C
authors.lastname: Noda
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: A
authors.initials: A
authors.lastname: Ichihara
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D003546:Cysteine Endopeptidases; D018076:DNA, Complementary / Q000235:genetics; D015536:Down-Regulation; D010450:Endopeptidases / Q000737:chemistry / Q000235:genetics; D006801:Humans; D007371:Interferon-gamma / Q000494:pharmacology*; D008285:Major Histocompatibility Complex; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes; D046988:Proteasome Endopeptidase Complex; D011506:Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D014407:Tumor Cells, Cultured
chemical_list: D018076:DNA, Complementary; D009097:Multienzyme Complexes; D011506:Proteins; C071313:LMP-2 protein; D007371:Interferon-gamma; D010450:Endopeptidases; D003546:Cysteine Endopeptidases; C077436:LMP7 protein; C088874:PSMB5 protein, human; C088875:PSMB6 protein, human; D046988:Proteasome Endopeptidase Complex