Actin-related protein Arp4 functions in kinetochore assembly.

Actin-related protein Arp4 functions in kinetochore assembly.
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DOI:
10.1093/nar/gkm161
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发表时间:
2007
影响因子:
14.9
通讯作者:
Seki M
Seki M
中科院分区:
生物学2区
文献类型:
--
作者:
Ogiwara H;Ui A;Kawashima S;Kugou K;Onoda F;Iwahashi H;Harata M;Ohta K;Enomoto T;Seki M

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肌动蛋白相关蛋白(Arps)是一个保守的蛋白家族。Arp 4p存在于INO 80和SWR 1染色质重塑复合物的大型多亚基中以及NuA 4组蛋白乙酰转移酶复合物中。在这里,我们发现arp 4(arp 4S 23 A/D159 A)的温度敏感细胞在G2/M期功能缺陷。arp 4突变体对微管解聚剂苯菌灵敏感,并在限制性温度下停滞在G2/M期。Arp 4p在整个细胞周期中与着丝粒和端粒区域相关。Ino 80 p、Esa 1 p和Swr 1 p分别是INO 80、NuA 4和SWR 1复合物的组分,也与着丝粒结合。许多动粒成分,包括Cse 4p,着丝粒核小体的一个组成部分,Mtw 1 p和Ctf 3 p的协会是部分受损的arp 4细胞,这表明arp 4突变细胞的G2/M期阻滞是由于染色体分离装置的形成缺陷。
The actin-related proteins (Arps) comprise a conserved protein family. Arp4p is found in large multisubunits of the INO80 and SWR1 chromatin remodeling complexes and in the NuA4 histone acetyltransferase complex. Here we show that arp4 (arp4S23A/D159A) temperature-sensitive cells are defective in G2/M phase function. arp4 mutants are sensitive to the microtubule depolymerizing agent benomyl and arrest at G2/M phase at restrictive temperature. Arp4p is associated with centromeric and telomeric regions throughout cell cycle. Ino80p, Esa1p and Swr1p, components of the INO80, NuA4 and SWR1 complexes, respectively, also associate with centromeres. The association of many kinetochore components including Cse4p, a component of the centromere nucleosome, Mtw1p and Ctf3p is partially impaired in arp4 cells, suggesting that the G2/M arrest of arp4 mutant cells is due to a defect in formation of the chromosomal segregation apparatus.
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