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Meiosis-specific cohesin component, Rec8, promotes the localization of Mps3 SUN domain protein on the nuclear envelope.

Genes Cells. 2019 Jan;24(1):94-106. doi:10.1111/gtc.12653. Epub 2018 Dec 12
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摘要


Proteins in the nuclear envelope (NE) play a role in the dynamics and functions of the nucleus and of chromosomes during mitosis and meiosis. Mps3, a yeast NE protein with a conserved SUN domain, predominantly localizes on a yeast centrosome equivalent, spindle pole body (SPB), in mitotic cells. During meiosis, Mps3, together with SPB, forms a distinct multiple ensemble on NE. How meiosis-specific NE localization of Mps3 is regulated remains largely unknown. In this study, we found that a meiosis-specific component of the protein complex essential for sister chromatid cohesion, Rec8, binds to Mps3 during meiosis and controls Mps3 localization and proper dynamics on NE. Ectopic expression of Rec8 in mitotic yeast cells induced the formation of Mps3 patches/foci on NE. This required the cohesin regulator, WAPL ortholog, Rad61/Wpl1, suggesting that a meiosis-specific cohesin complex with Rec8 controls NE localization of Mps3. We also observed that two domains of the nucleoplasmic region of Mps3 are essential for NE localization of Mps3 in mitotic as well as meiotic cells. We speculate that the interaction of Mps3 with the meiosis-specific cohesin in the nucleoplasm is a key determinant for NE localization/function of Mps3.

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