AMF1 (GPS2) modulates p53 transactivation.
We have reported that the papillomavirus E2 protein binds the nuclear factor AMF1 (also called G-protein pathway suppressor 2 or GPS2) and that their interaction is necessary for transcriptional activation by E2. It has also been shown that AMF1 can influence the activity of cellular transcription factors. These observations led ... us to test whether AMF1 regulates the functions of p53, a critical transcriptional activator that integrates stress signals and regulates cell cycle and programmed cell death. We report that AMF1 associates with p53 in vivo and in vitro and facilitates the p53 response by augmenting p53-dependent transcription. Overexpression of AMF1 in U2OS cells increases basal level p21(WAF1/CIP1) expression and causes a G(1) arrest. U2OS cells stably overexpressing AMF1 show increased apoptosis upon exposure to UV irradiation. These data demonstrate that AMF1 modulates p53 activities.
Mesh Terms:
Animals, Apoptosis, Cell Line, Cell Line, Transformed, Cyclin-Dependent Kinase Inhibitor p21, Cyclins, G1 Phase, Gene Expression, Humans, Intracellular Signaling Peptides and Proteins, Nuclear Proteins, Protein Binding, Repressor Proteins, Spodoptera, Transcriptional Activation, Tumor Cells, Cultured, Tumor Suppressor Protein p53, Ultraviolet Rays
Animals, Apoptosis, Cell Line, Cell Line, Transformed, Cyclin-Dependent Kinase Inhibitor p21, Cyclins, G1 Phase, Gene Expression, Humans, Intracellular Signaling Peptides and Proteins, Nuclear Proteins, Protein Binding, Repressor Proteins, Spodoptera, Transcriptional Activation, Tumor Cells, Cultured, Tumor Suppressor Protein p53, Ultraviolet Rays
Mol. Cell. Biol.
Date: Sep. 01, 2001
PubMed ID: 11486030
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