Regulation of dynein-driven microtubule sliding by the axonemal protein kinase CK1 in Chlamydomonas flagella.

Regulation of dynein-driven microtubule sliding by the axonemal protein kinase CK1 in Chlamydomonas flagella.
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DOI:
10.1083/jcb.200906168
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发表时间:
2009-09-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sale WS
Sale WS
中科院分区:
其他
文献类型:
--
作者:
Gokhale A;Wirschell M;Sale WS

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在体外将CK1添加到纯化轴突组中时,可以抑制动力蛋白的活性,可能是为了调节鞭毛弯曲的方式。对分离的纤毛/鞭毛轴突的实验分析表明,酪蛋白激酶I (CK1)参与了动力蛋白的调控。为了验证这一假设,我们开发了一种新的体外重组方法,使用纯化的重组莱因哈蒂衣藻CK1,以及来自瘫痪鞭毛突变体pf17的CK1缺失轴突蛋白,该突变体在径向辐条中存在缺陷,在动力蛋白驱动的微管滑动中受损。CK1抑制剂(DRB和CK1-7)和CK1的增溶恢复了pf17轴突的微管滑动,这与CK1的抑制作用是一致的。磷酸酶抑制剂微囊素- lr阻断了微管滑动的恢复,表明恢复所需的轴突磷酸酶保留在ck1缺失的轴突组中。用纯化的、重组的CK1重建贫轴突,以DRB -和CK1-7敏感的方式恢复微管滑动的抑制。相比之下,纯化的“激酶死亡”CK1未能恢复抑制作用。这些结果确定了轴突细胞CK1调节动力蛋白活性和鞭毛运动。
CK1 puts the brakes on dynein activity when added to purified axonemes in vitro, presumably to regulate how flagella bend. Experimental analysis of isolated ciliary/flagellar axonemes has implicated the protein kinase casein kinase I (CK1) in regulation of dynein. To test this hypothesis, we developed a novel in vitro reconstitution approach using purified recombinant Chlamydomonas reinhardtii CK1, together with CK1-depleted axonemes from the paralyzed flagellar mutant pf17, which is defective in radial spokes and impaired in dynein-driven microtubule sliding. The CK1 inhibitors (DRB and CK1-7) and solubilization of CK1 restored microtubule sliding in pf17 axonemes, which is consistent with an inhibitory role for CK1. The phosphatase inhibitor microcystin-LR blocked rescue of microtubule sliding, indicating that the axonemal phosphatases, required for rescue, were retained in the CK1-depleted axonemes. Reconstitution of depleted axonemes with purified, recombinant CK1 restored inhibition of microtubule sliding in a DRB– and CK1-7–sensitive manner. In contrast, a purified “kinase-dead” CK1 failed to restore inhibition. These results firmly establish that an axonemal CK1 regulates dynein activity and flagellar motility.
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