The NIMA-family kinase Nek6 phosphorylates the kinesin Eg5 at a novel site necessary for mitotic spindle formation.

The NIMA-family kinase Nek6 phosphorylates the kinesin Eg5 at a novel site necessary for mitotic spindle formation.
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DOI:
10.1242/jcs.035360
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发表时间:
2008-12-01
影响因子:
4
通讯作者:
Roig J
Roig J
中科院分区:
生物学2区
文献类型:
--
作者:
Rapley J;Nicolàs M;Groen A;Regué L;Bertran MT;Caelles C;Avruch J;Roig J

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Nek 6和Nerc 1/Nek 9属于NIMA蛋白激酶家族。Nerc 1在有丝分裂中被激活,因此它结合、磷酸化并激活Nek 6。在哺乳动物细胞中干扰Nek 6或Nercc 1会导致前中期/中期停滞,而爪蟾卵提取物中XNercc的缺失会阻止正常的纺锤体组装。在这里,我们表明,Nek 6是组成性相关的Eg 5,驱动蛋白所需的纺锤体双极性。Nek 6在体外几个位点磷酸化Eg 5,其中一个位点Ser 1033在体内有丝分裂过程中被磷酸化。虽然Cdk 1磷酸化几乎所有的Eg 5在有丝分裂期间在Thr 926,Nek 6磷酸化约3%的Eg 5,主要是在纺锤体极。Eg 5耗竭使具有单极纺锤体的细胞停滞;这可以被Eg 5野生型挽救,但不能被Eg 5(Thr 926 Ala)挽救。Eg 5(Ser 1033 Ala)挽救一半,野生型,而Eg 5(Ser 1033 Asp)突变体几乎是有效的。因此,Nek 6在有丝分裂期间在保守位点磷酸化Eg 5多肽的子集,其磷酸化对于Eg 5的有丝分裂功能至关重要。
Nek6 and Nercc1/Nek9 belong to the NIMA family of protein kinases. Nercc1 is activated in mitosis whereupon it binds, phosphorylates and activates Nek6. Interference with Nek6 or Nercc1 in mammalian cells causes prometaphase/metaphase arrest, and depletion of XNercc from Xenopus egg extracts prevents normal spindle assembly. Herein we show that Nek6 is constitutively associated with Eg5, a kinesin necessary for spindle bipolarity. Nek6 phosphorylates Eg5 at several sites in vitro, and one of these sites, Ser1033, is phosphorylated in vivo during mitosis. While Cdk1 phosphorylates nearly all Eg5 during mitosis at Thr926, Nek6 phosphorylates ~3% of Eg5, primarily at the spindle poles. Eg5 depletion arrests cells with a monopolar spindle; this can be rescued by Eg5 wildtype but not by Eg5(Thr926Ala). Eg5(Ser1033Ala) rescues half as well as wildtype whereas an Eg5(Ser1033Asp) mutant is nearly as effective. Thus Nek6 phosphorylates a subset of Eg5 polypeptides during mitosis at a conserved site, whose phosphorylation is critical for the mitotic function of Eg5.
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