Spatial separation of phosphatase and kinase activity within the Bub complex is required for proper mitosis.

Spatial separation of phosphatase and kinase activity within the Bub complex is required for proper mitosis.
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DOI:
10.1093/jmcb/mjac062
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发表时间:
2023-04-06
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学1区
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Bub1 和 BubR1 动粒蛋白支持适当的染色体分离和有丝分裂检查点活性。 Bub1 和 BubR1 是旁系同源物,其中 Bub1 是一种激酶,而 BubR1 将 PP2A-B56 蛋白磷酸酶定位于人类的着丝粒。激酶和磷酸酶活性的这种空间分离是否重要尚不清楚,因为一些生物体将这两种活性整合到一个 Bub 蛋白中。在这里,我们设计了人类 Bub1 和 BubR1 蛋白,将激酶和磷酸酶活性整合到一种蛋白中,并表明它们不支持正常的有丝分裂进程。 Bub1-PP2A-B56 复合物可以支持染色体排列,但由于 Bub1 中 Mad1 结合位点的去磷酸化而导致检查点受损。此外,含有 Bub1 激酶结构域的嵌合 BubR1 蛋白可诱导 H2ApT120 离域磷酸化,从而减少着丝粒 hSgo2 和染色体分离错误。总的来说,这些结果表明,Bub 复合体内激酶和磷酸酶活性的空间分离是平衡其在检查点和染色体排列中的功能所必需的。
The Bub1 and BubR1 kinetochore proteins support proper chromosome segregation and mitotic checkpoint activity. Bub1 and BubR1 are paralogs with Bub1 being a kinase, while BubR1 localizes the PP2A-B56 protein phosphatase to kinetochores in humans. Whether this spatial separation of kinase and phosphatase activity is important is unclear as some organisms integrate both activities into one Bub protein. Here, we engineer human Bub1 and BubR1 proteins integrating kinase and phosphatase activities into one protein and show that these do not support normal mitotic progression. A Bub1–PP2A-B56 complex can support chromosome alignment but results in impairment of the checkpoint due to dephosphorylation of the Mad1 binding site in Bub1. Furthermore, a chimeric BubR1 protein containing the Bub1 kinase domain induces delocalized H2ApT120 phosphorylation, resulting in the reduction of centromeric hSgo2 and chromosome segregation errors. Collectively, these results argue that the spatial separation of kinase and phosphatase activities within the Bub complex is required for balancing its functions in the checkpoint and chromosome alignment.
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