Regulation of cytokinesis

家长资助补助金摘要。胞质分裂，一个细胞物理分离成两个 子细胞，是细胞分裂的最后阶段，虽然它是最不清楚的，但它是 对发育和组织平衡至关重要。正确地定时胞质分裂， 只有在染色体复制和分离后，才有必要防止灾难性的 基因组不稳定性，因此，胞质分裂与其它细胞一起受到严格调节 循环事件。使用一种强大的模式生物，裂殖酵母粟酒裂殖酵母， 我的实验室进行了开创性的研究，以确定细胞分裂所必需的蛋白质， 了解构成细胞分裂机制的无数蛋白质是如何协调的， 确保细胞分裂的精确时空控制。我们建议继续我们的 在这一领域采用多学科方法开展基本问题的工作， 方向在一个方向上，我们将解决胞质分裂是如何夹带其他事件， 有丝分裂通过调查缺陷，导致抑制胞质分裂时，有丝分裂纺锤体 以及调节有丝分裂检查点分支的CK 1酶是如何被破坏的。 由纺锤体应力激活。了解CK 1在有丝分裂背景下的调节 检查点还将建立该酶家族的一般调节机制， 是保守的多功能激酶，在许多人类疾病中发挥作用。在第二 方向，我们将推进我们的组装和建筑的收缩 使用复杂的显微镜方法。我们将继续建立我们的知识 收缩环的主要支架，F-BAR蛋白Cdc 15，通过定义它如何寡聚化 以及其他收缩环成分是如何在细胞膜上组织的。 Cdc 15支架。我们还将测试我们的假设，即14-3-3蛋白抑制了 Cdc 15支架在不适当的位置和时间，确保它只在细胞中组装 在有丝分裂的中间。这些集中的机制研究将补充蛋白质组学 和大规模的基因筛选，旨在建立一个功能性的相互作用网络， 收缩环成分。总之，这些研究将对理解 胞质分裂如何在从酵母到人类的真核物种中进行。

Summary of the parent funded grant. Cytokinesis, the physical separation of one cell into two daughter cells, is the final stage of cell division, and although it is the least well understood, it is central to development and tissue homeostasis. Correctly timing cytokinesis so that it occurs only after chromosome replication and segregation is necessary to prevent catastrophic genomic instability, and accordingly, cytokinesis is strictly regulated in concert with other cell cycle events. Using a powerful model organism, the fission yeast Schizosaccharomyces pombe, my lab has conducted pioneering research to identify proteins essential for cytokinesis and to learn how the myriad proteins that comprise the cell division machinery are coordinated to ensure the exquisite spatial and temporal control of cell division. We propose to continue our work pursuing fundamental questions in this field using a multi-disciplinary approach in two directions. In one direction, we will tackle how cytokinesis is entrained with other events of mitosis by investigating the defect that leads to inhibition of cytokinesis when the mitotic spindle is disrupted and how the CK1 enzymes that regulate this branch of the mitotic checkpoint are activated by spindle stress. Understanding CK1 regulation in the context of the mitotic checkpoint will also establish general mechanisms of regulation for this enzyme family, which are conserved, multifunctional kinases with roles in numerous human diseases. In a second direction, we will advance our understanding of the assembly and architecture of the contractile ring using sophisticated microscopy approaches. We will continue to build our knowledge of the major scaffold of the contractile ring, the F-BAR protein Cdc15, by defining how it oligomerizes on the plasma membrane, and how other contractile ring components are organized on the Cdc15 scaffold. We will also test our hypothesis that 14-3-3 proteins inhibit the establishment of the Cdc15 scaffold at inappropriate locations and times, ensuring it only assembles in the cell middle during mitosis. These focused mechanistic studies will be complemented with proteomic and large-scale genetic screens designed to establish a functional interaction network of contractile ring components. Together, these studies will have a major impact for understanding how cytokinesis is orchestrated in eukaryotic species from yeast to humans.