Polyoma middle tumor antigen interacts with SHC protein via the NPTY (Asn-Pro-Thr-Tyr) motif in middle tumor antigen.
1994; National Academy of Sciences; Volume: 91; Issue: 14 Linguagem: Inglês
10.1073/pnas.91.14.6344
ISSN1091-6490
AutoresKathryn S. Campbell, Egon Ogris, Briant E. Burke, Su Wang, K R Auger, Brian J. Druker, Brian Schaffhausen, Thomas M. Roberts, D C Pallas,
Tópico(s)Virus-based gene therapy research
ResumoPolyomavirus middle tumor antigen (MT) transforms a large number of cell types by binding to and modulating the activities of cellular proteins. Previous genetic analysis defined in MT an independent motif, NPTY (Asn-Pro-Thr-Tyr), required for transformation. This report demonstrates that NPTY is required for interaction between MT and SHC protein, a Src homology 2 (SH2)-containing protooncogene product implicated in activating Ras via association with GRB2 protein. SHC is phosphorylated on tyrosine and associates with GRB2 in MT-transformed cells. These effects require an intact NPTY motif in MT. SHC immunoprecipitates from MT-transformed cells possess kinase activity that phosphorylates not only SHC and MT but also the 85-kDa subunit of phosphatidylinositol 3-kinase. This result suggests that a complex exists that contains, at a minimum, MT, Src family tyrosine kinases, phosphatidylinositol 3-kinase, and SHC.
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