title: p202 self-associates through a sequence conserved among the members of the 200-family proteins.
abstract: Murine p202 is an interferon-inducible primarily nuclear phosphoprotein (52 kDa) whose expression in transfected cells inhibits colony formation. p202-binding proteins include the pocket proteins (pRb, p107 and p130), a p53-binding protein (sm53BP1), and transcription factors (e.g. NF-kappaB (p50 and p65), AP-1 (c-Fos and c-Jun), E2F-1, E2F-4, MyoD, and myogenin). p202 modulates the transcriptional activity of these factors in transfected cells. Here we demonstrate that p202 self-associates directly and a sequence in p202, which is conserved among the members of the 200-family proteins, was sufficient for self-association in vitro. Our observations reported herein raise the possibility that self-association of p202 may provide a mechanism for the regulation of its activity.
authors.affiliation: Department of Molecular Oncology, The University of Texas M.D. Anderson Cancer Center, Houston 77030, USA.
authors.forename: D
authors.initials: D
authors.lastname: Koul
authors.forename: N U
authors.initials: NU
authors.lastname: Obeyesekere
authors.forename: J U
authors.initials: JU
authors.lastname: Gutterman
authors.forename: G B
authors.initials: GB
authors.lastname: Mills
authors.forename: D
authors.initials: D
authors.lastname: Choubey
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D002352:Carrier Proteins / Q000737:chemistry / Q000378:metabolism*; D002846:Chromatography, Affinity; D002868:Chromosomal Proteins, Non-Histone; D017124:Conserved Sequence; D003432:Cross-Linking Reagents; D004268:DNA-Binding Proteins; D019281:Dimerization; D004120:Dimethyl Suberimidate; D005982:Glutathione Transferase / Q000378:metabolism; D047908:Intracellular Signaling Peptides and Proteins; D051379:Mice; D005810:Multigene Family; D009687:Nuclear Proteins / Q000378:metabolism; D010455:Peptides / Q000378:metabolism; D010750:Phosphoproteins / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D014176:Protein Biosynthesis; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D017384:Sequence Deletion; D000071857:Tumor Suppressor p53-Binding Protein 1
chemical_list: D002352:Carrier Proteins; D002868:Chromosomal Proteins, Non-Histone; D003432:Cross-Linking Reagents; D004268:DNA-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009687:Nuclear Proteins; D010455:Peptides; D010750:Phosphoproteins; D011993:Recombinant Fusion Proteins; C498302:Trp53bp1 protein, mouse; D000071857:Tumor Suppressor p53-Binding Protein 1; D004120:Dimethyl Suberimidate; D005982:Glutathione Transferase