Abstract:
:Mammalian Mip/LIN-9 is a cell cycle regulatory protein that is negatively regulated by CDK4/cyclin D. It has been demonstrated that Mip/LIN-9 collaborates with B-Myb during S and G(2)/M in the induction of cyclins A and B, and CDK1. The ortholog of Mip/LIN-9 in Drosophila, Mip130, is part of a large multisubunit protein complex that includes RBF, repressor E2Fs and Myb, in what was termed the dREAM complex. A similar complex, although lacking B-Myb, was also described in Caenorhabditis elegans. Here, we demonstrate that unlike Drosophila, Mip/LIN-9 has mutually exclusive and cell cycle-phase-specific interactions with the mammalian orthologs of the dREAM complex. In G(0)/early G(1), Mip/LIN-9 forms a complex with E2F4 and p107 or p130, while in late G(1)/S phase, it associates with B-Myb. The separation of Mip/LIN-9 from p107,p130/E2F4 is likely driven by phosphorylation of the pocket proteins by CDK4 since Mip/LIN-9 fails to interact with phosphorylated forms of p107,p130. Importantly, the repressor complex that Mip/LIN-9 forms with p107 takes functional precedence over the transcriptional activation linked to the Mip/LIN-9 and B-Myb interaction since expression of p107 blocks the activation of the cyclin B promoter triggered by B-Myb and Mip/LIN-9.
journal_name
Oncogenejournal_title
Oncogeneauthors
Pilkinton M,Sandoval R,Colamonici ORdoi
10.1038/sj.onc.1210562subject
Has Abstractpub_date
2007-11-29 00:00:00pages
7535-43issue
54eissn
0950-9232issn
1476-5594pii
1210562journal_volume
26pub_type
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