title: Adenovirus 2 E1B-55K protein relieves p53-mediated transcriptional repression of the survivin and MAP4 promoters.
abstract: It is well established that adenovirus E1B-55K protein functions as an inhibitor of the tumor suppressor protein p53 by binding and inactivating p53 as a transcriptional activator protein. Here we show that the adenovirus 2 E1B-55K protein also blocks p53 as a transcriptional repressor protein of the survivin and the MAP4 promoters. The repression is dependent on the ability of E1B-55K to bind to p53 and is enhanced by coexpression of the adenovirus E4orf6 protein. Overexpression of the transcriptional corepressor protein Sin3A partially relieves the inhibitory effect of E1B-55K, suggesting that E1B-55K blocks p53 functions by interfering with the Sin3 complex.
authors.affiliation: Department of Medical Biochemistry and Microbiology, Uppsala University, Box 582, 751 23 Uppsala, Sweden. tanel.punga@imbim.uu.se
authors.forename: Tanel
authors.initials: T
authors.lastname: Punga
authors.forename: Göran
authors.initials: G
authors.lastname: Akusjärvi
mesh_terms: D017501:Adenovirus E1B Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017504:Adenovirus E4 Proteins / Q000235:genetics / Q000378:metabolism; D000260:Adenoviruses, Human / Q000235:genetics / Q000378:metabolism*; D002460:Cell Line; D006801:Humans; D066298:In Vitro Techniques; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins / Q000235:genetics*; D009363:Neoplasm Proteins; D016366:Open Reading Frames; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012097:Repressor Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D056264:Sin3 Histone Deacetylase and Corepressor Complex; D000077022:Survivin; D014158:Transcription, Genetic; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: D017501:Adenovirus E1B Proteins; D017504:Adenovirus E4 Proteins; C107489:BIRC5 protein, human; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D011994:Recombinant Proteins; D012097:Repressor Proteins; C099683:SIN3A transcription factor; D000077022:Survivin; D016159:Tumor Suppressor Protein p53; D056264:Sin3 Histone Deacetylase and Corepressor Complex