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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mouse p53 inhibits SV40 origin-dependent DNA replication.

p53 is a cellular phosphoprotein that is present at elevated concentrations in cells transformed by different agents. p53 complementary DNA expression-constructs immortalize primary cells in vitro and co-operate with an activated ras oncogene in malignant transformation. Several reports have implicated p53 in mammalian cell cycle control and specifically with events occurring at the G0-G1 boundary. p53 forms specific complexes with simian virus 40 (SV40) large-T antigen, and such complexes are found associated with both replicating and mature SV40 DNA in lytically infected cells. In an accompanying paper Gannon and Lane report that in in vitro plate-binding assays, mouse p53 can displace polymerase alpha from complex with T-antigen. We have examined the in vivo consequences of expressing wild-type and mutant p53 proteins from other species in SV40-transformed monkey cells. We report here that expression of mouse p53 results in a substantial and selective inhibition of SV40 origin-dependent DNA replication. In addition to any function in the G0-G1 transition, the data presented suggest that p53 may affect directly the initiation or maintenance of replicative DNA synthesis.[1]


  1. Mouse p53 inhibits SV40 origin-dependent DNA replication. Braithwaite, A.W., Sturzbecher, H.W., Addison, C., Palmer, C., Rudge, K., Jenkins, J.R. Nature (1987) [Pubmed]
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