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The 19S proteasome subunit Rpt3 regulates distribution of CENP-A by associating with centromeric chromatin.

Nat Commun. 2014 Apr 07;5:3597
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摘要


CENP-A, a variant of histone H3, is incorporated into centromeric chromatin and plays a role during kinetochore establishment. In fission yeast, the localization of CENP-A is limited to a region spanning 10-20 kb of the core domain of the centromere. Here, we report a mutant (rpt3-1) in which this region is expanded to 40-70 kb. Likely due to abnormal distribution of CENP-A, this mutant exhibits chromosome instability and enhanced gene silencing. Interestingly, the rpt3(+) gene encodes a subunit of the 19S proteasome, which localizes to the nuclear membrane. Although Rpt3 associates with centromeric chromatin, the mutant protein has lost this localization. A loss of the cut8(+) gene encoding an anchor of the proteasome to the nuclear membrane causes similar phenotypes as observed in the rpt3-1 mutant. Thus, we propose that the proteasome (or its subcomplex) associates with centromeric chromatin and regulates distribution of CENP-A.

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