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Deletion of the p107/p130-binding domain of Mip130/LIN-9 bypasses the requirement for CDK4 activity for the dissociation of Mip130/LIN-9 from p107/p130-E2F4 complex.

Abstract：

:Mip130/LIN-9 is part of a large complex that includes homologs of the Drosophila dREAM (drosophila RB-like, E2F, and Myb) and C. elegans DRM complexes. This complex also includes proteins such as Mip40/LIN-37, Mip120/LIN-54, and LIN-52. In mammalian cells, Mip130/LIN-9 specifically associates with the p107/p130-E2F4 repressor complex in G0/G1 and with B-Myb in S-phase. However, little is known about how the transition occurs and whether Mip130/LIN-9 contributes to the repressor effect of p107/p130. In this report, we demonstrate that Mip130/LIN-9, Mip40/LIN-37, Mip120/LIN-54, and Sin3b form a core complex, the Mip Core Complex or LIN Complex (MCC/LINC), which is detectable in all phases of the cell cycle. This complex specifically recruits transcriptional repressors such as p107, p130, E2F4 and HDAC1 in G0/G1, and B-Myb in S-phase. Importantly, we provide strong evidence that the transition between repressors and activators of transcription is mediated by CDK4, through the phosphorylation of the pocket proteins, p107 and p130. The requirement for CDK4 activity is bypassed by the deletion of the first 84 amino acids (Mip130/LIN-9(Delta84)), since this mutant is unable to interact with p107/p130 in G0/G1, while maintaining its association with B-Myb. Importantly, the Mip130/LIN-9(Delta84) allele rescues the low expression of G1/S genes observed in CDK4(-/-) MEFs demonstrating that Mip130/LIN-9 contributes to the repression of these E2F-regulated genes in G0/G1.

journal_name

Exp Cell Res

journal_title

Experimental cell research

authors

Sandoval R,Pilkinton M,Colamonici OR

doi

10.1016/j.yexcr.2009.07.014

subject

Has Abstract

pub_date

2009-10-15 00:00:00

pages

2914-20

issue

17

eissn

0014-4827

issn

1090-2422

pii

S0014-4827(09)00329-2

journal_volume

315

pub_type

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