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Papers In Press, published online ahead of print July 20, 2000
Dept. of Surgery, University of Liverpool, Liverpool L69 3GA
Corresponding Author: mboyd{at}liverpool.ac.uk
The MDM2 protein, through its interaction with p53 plays an important role in the regulation of the G1 checkpoint of the cell cycle. In addition to binding to and inhibiting the transcriptional activation function of the p53 protein, MDM2 binds, inter alia, to RB, and the E2F-1/DP-1 complex and in so doing may promote progression of cells into S-phase. Mice transgenic for MDM2 possess cells that have cell cycle regulation defects and develop an altered tumour profile independent of their p53 status. MDM2 also blocks the growth inhibitory effects of TGF-b1 in a p53 independent manner. We show here that a novel growth regulatory molecule is also the target of MDM2 mediated inhibition. Using a yeast two-hybrid screen we have identified a gene that encodes a novel cellular protein, MDM2 binding protein (MTBP), that binds to MDM2. MTBP can induce G1 arrest and this in turn can be blocked by MDM2. Our results suggest the existence of another growth control pathway that may be regulated, at least in part, by MDM2.
J. Biol. Chem, 10.1074/jbc.M004252200
Submitted on May 18, 2000
Revised on July 18, 2000
Accepted on July 19, 2000
A novel cellular protein MTBP binds to MDM2 and induces a G1 arrest that is suppressed by MDM2
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