Adenovirus E4orf6 oncoprotein modulates the function of the p53-related protein, p73.
Recently, several proteins have been identified that are related in their sequence to the p53 tumor-suppressor protein. One of these proteins, which is termed p73, exhibits sequence homology to the p53 transcriptional activation, DNA binding, and oligomerization domains. The adenovirus E1B 55-kDa protein, the adenovirus E4orf6 protein, and SV40 T antigen each can bind to p53 and inhibit p53 function. Here we demonstrate that the adenovirus E4orf6 protein, but not the E1B 55-kDa protein or T antigen, interacts with p73. The E4orf6 protein inhibits p73-mediated transcriptional activation and cell killing in a manner similar to its effect on p53. Thus, only a subset of viral oncoproteins that antagonize p53 function also interacts with the related p73 protein.
Higashino
F
F
Howard Hughes Medical Institute, Department of Molecular Biology, Princeton University, Princeton, NJ 08544-1014, USA.
Pipas
J M
JM
Shenk
T
T
D000256:Adenoviridae / Q000235:genetics / Q000502:physiology*; D017501:Adenovirus E1B Proteins / Q000235:genetics / Q000378:metabolism; D017504:Adenovirus E4 Proteins / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D017930:Genes, Reporter; D016147:Genes, Tumor Suppressor; D006801:Humans; D008156:Luciferases / Q000235:genetics; D008322:Mammals; D009687:Nuclear Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015533:Transcriptional Activation; D014162:Transfection; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53 / Q000737:chemistry / Q000378:metabolism; D025521:Tumor Suppressor Proteins
D017501:Adenovirus E1B Proteins; D017504:Adenovirus E4 Proteins; D004268:DNA-Binding Proteins; D009687:Nuclear Proteins; D011993:Recombinant Fusion Proteins; C000606460:TP73 protein, human; D000072160:Tumor Protein p73; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D008156:Luciferases