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深入了解动力蛋白-14 Ncd 的 EB1 依赖性尖端追踪过程。微管的作用。

Insights into the process of EB1-dependent tip-tracking of kinesin-14 Ncd. The role of the microtubule.

机构信息

Department of Biochemistry, Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur St., 02-093 Warsaw, Poland.

出版信息

Eur J Cell Biol. 2016 Dec;95(12):521-530. doi: 10.1016/j.ejcb.2016.08.004. Epub 2016 Aug 31.


DOI:10.1016/j.ejcb.2016.08.004
PMID:27608966
Abstract

End-binding proteins are capable of tracking the plus-ends of growing microtubules (MTs). The motor protein Ncd, a member of the kinesin-14 family, interacts with EB1 protein and becomes a non-autonomous tip-tracker. Here, we attempted to find out whether at least for Ncd, the efficient EB1-mediated tip-tracking involves the interaction of the kinesin with the MT surface. We prepared a series of Ncd tail mutants in which the MT-binding sites were altered or eliminated. Using TIRF microscopy, we characterized their behavior as tip-trackers and measured the dwell times of single molecules of EB1 and Ncd tail or its mutated forms. The mutated forms of Ncd tail exhibited tip-tracking in the presence of EB1 and the effectiveness of this process was proportional to the affinity of the mutant's tail to MT. Even though the interaction of Ncd with EB1 was weak (K∼9μM) the half saturating concentration of EB1 for tip-tracking was 7nM. The dwell time of Ncd tail in the presence of EB1 was ∼1s. The dwell time of EB1 alone was shorter (∼0.3s) and increased considerably in the presence of a large excess of Ncd tail. We demonstrated that tip-tracking of kinesin-14 occurs through several concurrent mechanisms: binding of kinesin only to EB1 located at the MT end, interaction of the kinesin molecules with a composite site formed by EB1 and the MT tip, and probably surface diffusion of the tail along MT. The second mechanism seems to play a crucial role in efficient tip-tracking.

摘要

末端结合蛋白能够追踪不断生长的微管(MT)的正极。动力蛋白 Ncd 是驱动蛋白-14 家族的成员,与 EB1 蛋白相互作用,成为非自主尖端追踪器。在这里,我们试图找出至少对于 Ncd 来说,有效的 EB1 介导的尖端追踪是否涉及到马达蛋白与 MT 表面的相互作用。我们制备了一系列 Ncd 尾部突变体,其中改变或消除了 MT 结合位点。我们使用 TIRF 显微镜对其作为尖端追踪器的行为进行了表征,并测量了 EB1 和 Ncd 尾部或其突变体形式的单分子停留时间。Ncd 尾部的突变体在 EB1 的存在下表现出尖端追踪,该过程的有效性与突变体尾部与 MT 的亲和力成正比。尽管 Ncd 与 EB1 的相互作用较弱(K∼9μM),但 EB1 用于尖端追踪的半饱和浓度为 7nM。在 EB1 存在下,Ncd 尾部的停留时间约为 1s。EB1 单独的停留时间较短(约 0.3s),但在存在大量过量的 Ncd 尾部时会大大增加。我们证明,驱动蛋白-14 的尖端追踪通过几种并发机制发生:驱动蛋白仅与位于 MT 末端的 EB1 结合,驱动蛋白分子与由 EB1 和 MT 尖端形成的复合位点相互作用,以及可能沿 MT 进行尾部的表面扩散。第二种机制似乎在有效的尖端追踪中起着至关重要的作用。

相似文献

[1]
Insights into the process of EB1-dependent tip-tracking of kinesin-14 Ncd. The role of the microtubule.

Eur J Cell Biol. 2016-8-31

[2]
The human kinesin-14 HSET tracks the tips of growing microtubules in vitro.

Cytoskeleton (Hoboken). 2013-10-8

[3]
NOD is a plus end-directed motor that binds EB1 via a new microtubule tip localization sequence.

J Cell Biol. 2018-6-13

[4]
Identification of microtubule binding sites in the Ncd tail domain.

Biochemistry. 1999-2-9

[5]
Kif18B interacts with EB1 and controls astral microtubule length during mitosis.

Mol Biol Cell. 2011-7-7

[6]
Direct regulation of microtubule dynamics by KIF17 motor and tail domains.

J Biol Chem. 2013-9-26

[7]
Biased Brownian motion as a mechanism to facilitate nanometer-scale exploration of the microtubule plus end by a kinesin-8.

Proc Natl Acad Sci U S A. 2015-7-21

[8]
TIP maker and TIP marker; EB1 as a master controller of microtubule plus ends.

J Cell Biol. 2005-10-24

[9]
Microtubule plus-end tracking of end-binding protein 1 (EB1) is regulated by CDK5 regulatory subunit-associated protein 2.

J Biol Chem. 2017-5-5

[10]
Microtubule plus-end tracking by CLIP-170 requires EB1.

Proc Natl Acad Sci U S A. 2009-1-13

引用本文的文献

[1]
The Kinesin-14 tail: Dual microtubule binding domains drive spindle morphogenesis through tight microtubule cross-linking and robust sliding.

Mol Biol Cell. 2025-6-1

[2]
Kinesin-14 motors participate in a force balance at microtubule plus-ends to regulate dynamic instability.

Proc Natl Acad Sci U S A. 2022-2-22

[3]
The Putative RNA-Binding Protein Dri1 Promotes the Loading of Kinesin-14/Klp2 to the Mitotic Spindle and Is Sequestered into Heat-Induced Protein Aggregates in Fission Yeast.

Int J Mol Sci. 2021-4-30

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