title: Structure of the p53 binding domain of HAUSP/USP7 bound to Epstein-Barr nuclear antigen 1 implications for EBV-mediated immortalization.
abstract: USP7/HAUSP is a key regulator of p53 and Mdm2 and is targeted by the Epstein-Barr nuclear antigen 1 (EBNA1) protein of Epstein-Barr virus (EBV). We have determined the crystal structure of the p53 binding domain of USP7 alone and bound to an EBNA1 peptide. This domain is an eight-stranded beta sandwich similar to the TRAF-C domains of TNF-receptor associated factors, although the mode of peptide binding differs significantly from previously observed TRAF-peptide interactions in the sequence (DPGEGPS) and the conformation of the bound peptide. NMR chemical shift analyses of USP7 bound by EBNA1 and p53 indicated that p53 binds the same pocket as EBNA1 but makes less extensive contacts with USP7. Functional studies indicated that EBNA1 binding to USP7 can protect cells from apoptotic challenge by lowering p53 levels. The data provide a structural and conceptual framework for understanding how EBNA1 might contribute to the survival of Epstein-Barr virus-infected cells.
authors.affiliation: Department of Medical Genetics and Microbiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
authors.forename: Vivian
authors.initials: V
authors.lastname: Saridakis
authors.forename: Yi
authors.initials: Y
authors.lastname: Sheng
authors.forename: Feroz
authors.initials: F
authors.lastname: Sarkari
authors.forename: Melissa N
authors.initials: MN
authors.lastname: Holowaty
authors.forename: Kathy
authors.initials: K
authors.lastname: Shire
authors.forename: Tin
authors.initials: T
authors.lastname: Nguyen
authors.forename: Rongguang G
authors.initials: RG
authors.lastname: Zhang
authors.forename: Jack
authors.initials: J
authors.lastname: Liao
authors.forename: Weontae
authors.initials: W
authors.lastname: Lee
authors.forename: Aled M
authors.initials: AM
authors.lastname: Edwards
authors.forename: Cheryl H
authors.initials: CH
authors.lastname: Arrowsmith
authors.forename: Lori
authors.initials: L
authors.lastname: Frappier
mesh_terms: D000595:Amino Acid Sequence; D017209:Apoptosis; D001665:Binding Sites; D018360:Crystallography, X-Ray; D010450:Endopeptidases / Q000737:chemistry* / Q000378:metabolism*; D019309:Epstein-Barr Virus Nuclear Antigens / Q000737:chemistry* / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D004854:Herpesvirus 4, Human / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000737:chemistry; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000378:metabolism; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D016159:Tumor Suppressor Protein p53 / Q000737:chemistry* / Q000378:metabolism*; D043222:Ubiquitin Thiolesterase; D000076084:Ubiquitin-Specific Peptidase 7
chemical_list: D019309:Epstein-Barr Virus Nuclear Antigens; D010446:Peptide Fragments; D011993:Recombinant Fusion Proteins; D016159:Tumor Suppressor Protein p53; D010450:Endopeptidases; C464569:USP7 protein, human; D043222:Ubiquitin Thiolesterase; D000076084:Ubiquitin-Specific Peptidase 7; C417029:EBV-encoded nuclear antigen 1