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    Cell Cycle. 2007 Aug 1;6(15):1903-13. Epub 2007 May 25.

    LINC, a human complex that is related to pRB-containing complexes in invertebrates regulates the expression of G2/M genes.

    Schmit F, Korenjak M, Mannefeld M, Schmitt K, Franke C, von Eyss B, Gagrica S, Hänel F, Brehm A, Gaubatz S.

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    Department of Physiological Chemistry I, Biocenter, University of Würzburg, Würzburg, Germany.

    Abstract

    Here we report the identification of the LIN complex (LINC), a human multiprotein complex that is required for transcriptional activation of G2/M genes. LINC is related to the recently identified dREAM and DRM complexes of Drosophila and C. elegans that contain homologs of the mammalian retinoblastoma tumor suppressor protein. The LINC core complex consists of at least five subunits including the chromatin-associated LIN-9 and RbAp48 proteins. LINC dynamically associates with pocket proteins, E2F and B-MYB during the cell cycle. In quiescent cells, LINC binds to p130 and E2F4. During cell cycle entry, E2F4 and p130 dissociate and LINC switches to B-MYB and p107. Chromatin Immunoprecipitation experiments demonstrate that LINC associates with a large number of E2F-regulated promoters in quiescent cells. However, RNAi experiments reveal that LINC is not required for repression. In S-phase, LINC selectively binds to the promoters of G2/M genes whose products are required for mitosis and plays an important role in their cell cycle dependent activation.

    PMID:
    17671431
    [PubMed - indexed for MEDLINE]
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