Phosphorylation of CAP-G is required for its chromosomal DNA localization during mitosis.

Phosphorylation of CAP-G is required for its chromosomal DNA localization during mitosis.
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DOI:
10.1016/j.bbrc.2008.10.114
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发表时间:
2008-12-19
影响因子:
3.1
通讯作者:
Sarge, Kevin D.
Sarge, Kevin D.
中科院分区:
生物学4区
文献类型:
--
作者:
Murphy, Lynea A.;Sarge, Kevin D.

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凝缩蛋白是一种5亚基复合物,在有丝分裂过程中对染色体结构起重要作用。众所周知,cdc2/细胞周期蛋白B在有丝分裂开始时对凝缩蛋白亚基的磷酸化对凝缩蛋白活性很重要,但这些磷酸化事件的位点尚未确定,也未确定它们在调节凝缩蛋白功能中的作用。在这里,我们鉴定了凝缩蛋白CAP-G亚基中的两个苏氨酸残基,苏氨酸308和332,它们是cdc2/cyclin B磷酸化的靶标。这些苏氨酸向丙氨酸的突变导致有丝分裂期间染色体上CAP-G定位的缺陷。这些结果首次确定了凝缩蛋白复合物内的磷酸化位点,这些磷酸化位点调节凝缩蛋白与染色体DNA的定位。
Condensin is a 5 subunit complex that plays an important role in the structure of chromosomes during mitosis. It is known that phosphorylation of condensin subunits by cdc2/cyclin B at the beginning of mitosis is important for condensin activity, but the sites of these phosphorylation events have not been identified nor has their role in regulating condensin function. Here we identify two threonine residues in the CAP-G subunit of condensin, threonines 308 and 332, that are targets of cdc2/cyclin B phosphorylation. Mutation of these threonines to alanines results in defects in CAP-G localization with chromosomes during mitosis. These results are the first to identify phosphorylation sites within the condensin complex that regulate condensin localization with chromosomal DNA.
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