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  • The SV40 large T antigen contains a decoy phosphodegron that mediates its interactions with Fbw7/hCdc4.

The SV40 large T antigen contains a decoy phosphodegron that mediates its interactions with Fbw7/hCdc4.

The Journal of biological chemistry (2004-12-22)
Markus Welcker, Bruce E Clurman
ABSTRACT

Cell transformation by simian virus 40 (SV40) results mostly from the highly oncogenic activities of the large T antigen (LT), which corrupts the cellular checkpoint mechanisms that guard cell division and the transcription, replication, and repair of DNA. The most prominent LT targets are the retinoblastoma protein (pRb) and p53. Here we report that LT binds directly to Fbw7, the substrate recognition component of the SCF(Fbw7) ubiquitin ligase and a human tumor suppressor. LT binding mislocalizes the nucleolar Fbw7gamma isoform to the nucleoplasm. Interestingly, the binding of LT to Fbw7 occurs via a decoy phospho-epitope within the C terminus of LT that closely mimics the consensus Cdc4 phospho-degron found within Fbw7 substrates. We demonstrate that, using this mode of interaction, LT can interfere with Fbw7-driven cyclin E turnover in vivo and causes increased cyclin E-associated kinase activity. Our data suggest that LT competes with cellular proteins for Fbw7 binding in a substrate-like fashion.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-hFBXW7 antibody , Mouse monoclonal, clone FB407, purified from hybridoma cell culture
Sigma-Aldrich
Monoclonal Anti-hFBXW7γ antibody produced in mouse, ~2 mg/mL, clone FB343, purified immunoglobulin, buffered aqueous solution

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