Molecular model of fission yeast centrosome assembly determined by superresolution imaging.

Molecular model of fission yeast centrosome assembly determined by superresolution imaging.
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DOI:
10.1083/jcb.201701041
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发表时间:
2017-08-07
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Jaspersen SL
Jaspersen SL
中科院分区:
其他
文献类型:
--
作者:
Bestul AJ;Yu Z;Unruh JR;Jaspersen SL

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贝斯特尔等人利用超分辨率成像技术研究裂殖酵母中心体组装。他们的工作揭示了与芽殖酵母中心体复制的相似之处和不同点,包括Sfi1参与复制以及SUN蛋白定位于一个环状结构。 微管组织中心(MTOCs)在动物中被称为中心体,在真菌中被称为纺锤极体(SPBs),对于有丝分裂过程中子细胞之间染色体的准确分配以及其他细胞功能都非常重要。粟酒裂殖酵母SPB的细胞质复制周期和调控与中心体类似,这使其成为研究MTOC组装的理想模型。在此,我们利用超分辨率结构照明显微术结合单粒子平均法对14种粟酒裂殖酵母SPB组分和调节因子进行定位,确定了SPB内蛋白质之间的相互关系以及在SPB复制过程中每种蛋白质是如何组装成一个新结构的。这些数据使我们能够构建出第一个粟酒裂殖酵母SPB的综合分子模型,从而获得了通过对单个亚基的研究无法确定的结构和功能方面的见解,包括Ppc89与芽殖酵母SPB支架蛋白Spc42之间的功能相似性、Sad1分布于一个环状结构以及Mto1募集的多种模式。
Bestul et al. use superresolution imaging to study fission yeast centrosome assembly. Their work reveals similarities and differences to duplication of the budding yeast centrosome, including involvement of Sfi1 in duplication and localization of SUN proteins to a ring-like structure. Microtubule-organizing centers (MTOCs), known as centrosomes in animals and spindle pole bodies (SPBs) in fungi, are important for the faithful distribution of chromosomes between daughter cells during mitosis as well as for other cellular functions. The cytoplasmic duplication cycle and regulation of the Schizosaccharomyces pombe SPB is analogous to centrosomes, making it an ideal model to study MTOC assembly. Here, we use superresolution structured illumination microscopy with single-particle averaging to localize 14 S. pombe SPB components and regulators, determining both the relationship of proteins to each other within the SPB and how each protein is assembled into a new structure during SPB duplication. These data enabled us to build the first comprehensive molecular model of the S. pombe SPB, resulting in structural and functional insights not ascertained through investigations of individual subunits, including functional similarities between Ppc89 and the budding yeast SPB scaffold Spc42, distribution of Sad1 to a ring-like structure and multiple modes of Mto1 recruitment.
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