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- W1978521623 abstract "The proliferation-stimulating transactivator FOXM1c (MPP2) is repressed by RB and activated by cyclin D1/Cdk4 and therefore behaves like E2F. Despite its strong transactivation domain, FOXM1c is kept almost inactive by two different inhibitory domains, the N-terminus and the central domain. The tumor suppressor RB binds directly to the central domain of FOXM1c and thereby indirectly represses the transactivation domain, so that the central domain of FOXM1c functions as an RB-recruiting negative-regulatory domain. Cyclin D1/Cdk4 releases FOXM1c from this repression by RB and from the repression by its own inhibitory N-terminus, thereby strongly activating FOXM1c. However, cyclin D1/Cdk4 does not directly affect the transactivation domain or the DNA-binding domain. By phosphorylation of RB, but not FOXM1c, cyclin D1/Cdk4 interrupts their direct interaction and thus abrogates the repression of FOXM1c by RB. Cyclin D1/Cdk4 also eliminates the inhibition of the transactivation domain by the N-terminus of FOXM1c, probably by interruption of their direct interaction. Consequently, the G1-phase proliferation signal cyclin D1/Cdk4 converts FOXM1c from an almost inactive form into a strong transactivator in G1-phase, i.e., just at the time point at which the transcriptional activity of FOXM1 is required for stimulation of the G1/S-transition." @default.
- W1978521623 created "2016-06-24" @default.
- W1978521623 creator A5055189220 @default.
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- W1978521623 date "2006-01-01" @default.
- W1978521623 modified "2023-10-03" @default.
- W1978521623 title "Transcription factor FOXM1c is repressed by RB and activated by cyclin D1/Cdk4" @default.
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- W1978521623 doi "https://doi.org/10.1515/bc.2006.119" @default.
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