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Protein arms in the kinetochore-microtubule interface of the yeast DASH complex

机译:酵母DASH复合物的线粒体-微管界面中的蛋白质臂

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摘要

The yeast DASH complex is a heterodecameric component of the kinetochore necessary for accurate chromosome segregation. DASH forms closed rings around microtubules with a large gap between the DASH ring and the microtubule cylinder. We characterized the microtubule-binding properties of limited proteolysis products and subcomplexes of DASH, thus identifying candidate polypeptide extensions involved in establishing the DASH-microtubule interface. The acidic C-terminal extensions of tubulin subunits are not essential for DASH binding. We also measured the molecular mass of DASH rings on microtubules with scanning transmission electron microscopy and found that approximately 25 DASH heterodecamers assemble to form each ring. Dynamic association and relocation of multiple flexible appendages of DASH may allow the kinetochore to translate along the microtubule surface.
机译:酵母DASH复合物是精确染色体分离所必需的动线粒的异十聚体成分。 DASH在微管周围形成闭合环,在DASH环和微管圆柱体之间有很大的间隙。我们表征了有限的蛋白水解产物和DASH的亚复合物的微管结合特性,从而确定了参与建立DASH-微管界面的候选多肽延伸。微管蛋白亚基的酸性C-末端延伸对于DASH结合不是必需的。我们还通过扫描透射电子显微镜测量了微管上DASH环的分子量,发现大约25个DASH异聚体组装形成了每个环。 DASH的多个柔性附件的动态关联和重定位可以使动线粒体沿微管表面平移。

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