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EMBO J
2019 Feb 15;384:. doi: 10.15252/embj.2018100093.
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CDK phosphorylation of Xenopus laevis M18BP1 promotes its metaphase centromere localization.
French BT
,
Straight AF
.
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Chromosome segregation requires the centromere, the site on chromosomes where kinetochores assemble in mitosis to attach chromosomes to the mitotic spindle. Centromere identity is defined epigenetically by the presence of nucleosomes containing the histone H3 variant CENP-A. New CENP-A nucleosome assembly occurs at the centromere every cell cycle during G1, but how CENP-A nucleosome assembly is spatially and temporally restricted remains poorly understood. Centromere recruitment of factors required for CENP-A assembly is mediated in part by the three-protein Mis18 complex (Mis18α, Mis18β, M18BP1). Here, we show that Xenopus M18BP1 localizes to centromeres during metaphase-prior to CENP-A assembly-by binding to CENP-C using a highly conserved SANTA domain. We find that Cdk phosphorylation of M18BP1 is necessary for M18BP1 to bind CENP-C and localize to centromeres in metaphase. Surprisingly, mutations which disrupt the metaphase M18BP1/CENP-C interaction cause defective nuclear localization of M18BP1 in interphase, resulting in defective CENP-A nucleosome assembly. We propose that M18BP1 may identify centromeric sites in metaphase for subsequent CENP-A nucleosome assembly in interphase.
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