Near-atomic cryo-EM structure of yeast kinesin-5-microtubule complex reveals a distinct binding footprint

Near-atomic cryo-EM structure of yeast kinesin-5-microtubule complex reveals a distinct binding footprint
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酵母驱动蛋白-5-微管复合物的近原子冷冻电镜结构揭示了独特的结合足迹

DOI:
10.1101/302455
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发表时间:
2018
期刊:
--
影响因子:
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通讯作者:
Von Loeffelholz O
Von Loeffelholz O
中科院分区:
--
文献类型:
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作者:
Von Loeffelholz O

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< jats: title> 摘要< jats: p> Kinesin-5 是微管依赖性马达超家族的重要成员,在细胞分裂中发挥保守作用。我们使用冷冻电子显微镜研究了运动-微管界面的共同进化,以确定与裂变酵母微管结合的裂变酵母驱动蛋白-5 Cut7的运动结构域的近原子结构。 AMPPNP 结合的 Cut7 采用驱动蛋白保守的 ATP 样构象,具有封闭的核苷酸结合袋和支持盖颈束形成的对接颈接头。与哺乳动物的微管蛋白微管相比,Cut7 在粟酒裂殖酵母微管表面上的足迹由于其不同的结构而略有不同。然而,刺激运动 ATP 酶的核心运动-微管相互作用是严格保守的,这反映在每种微管类型上相似的 Cut7 ATP 酶活性上。粟酒裂殖酵母微管与药物埃坡霉素结合,在紫杉烷结合袋中可见。 < jats:斜体> 尽管具有非规范的结构和机械化学,但粟酒裂殖酵母微管的稳定性是通过药物在该保守位点的结合介导的。< jats:sec>< jats:title>亮点< jats:p>< jats:list list-type =“bullet”>< jats:list-item>< jats:p>< jats:斜体> S. pombe Cut7 在< jats: 斜体> 粟酒裂殖酵母微管< jats: list-item>< jats: p> 驱动运动 ATP 酶微管激活的核心接口是保守的< jats: list-item>< jats: p> 颈接头对接在 AMPPNP 结合的 Cut7 中,形成盖颈束< jats: list-item>< jats: p> 埃博霉素在紫杉烷结合位点结合以稳定< jats: 斜体> S. pombe 微管< jats: sec>< jats: title> eTOC 文本< jats: p> 为了研究运动微管界面的共同进化,我们使用冷冻电子显微镜来确定 Cut7(裂殖酵母驱动蛋白-5)运动结构域的近原子结构,该结构与由天然纯化的裂殖酵母微管蛋白聚合而成并通过药物稳定的微管结合埃坡霉素。
< jats: title> Summary< jats: p> Kinesin-5s are essential members of the superfamily of microtubule-dependent motors that undertake conserved roles in cell division. We investigated coevolution of the motor-microtubule interface using cryo-electron microscopy to determine the near-atomic structure of the motor domain of Cut7, the fission yeast kinesin-5, bound to fission yeast microtubules. AMPPNP-bound Cut7 adopts a kinesin-conserved ATP-like conformation, with a closed nucleotide binding pocket and docked neck linker that supports cover neck bundle formation. Compared to mammalian tubulin microtubules, Cut7’s footprint on< jats: italic> S. pombe microtubule surface is subtly different because of their different architecture. However, the core motor-microtubule interaction that stimulates motor ATPase is tightly conserved, reflected in similar Cut7 ATPase activities on each microtubule type. The< jats: italic> S. pombe microtubules were bound by the drug epothilone, which is visible in the taxane binding pocket. Stabilization of< jats: italic> S. pombe microtubules is mediated by drug binding at this conserved site despite their noncanonical architecture and mechanochemistry.< jats: sec>< jats: title> Highlights< jats: p>< jats: list list-type=" bullet">< jats: list-item>< jats: p>< jats: italic> S. pombe Cut7 has a distinct binding footprint on< jats: italic> S. pombe microtubules< jats: list-item>< jats: p> The core interface driving microtubule activation of motor ATPase is conserved< jats: list-item>< jats: p> The neck linker is docked in AMPPNP-bound Cut7 and the cover neck bundle is formed< jats: list-item>< jats: p> Epothilone binds at the taxane binding site to stabilize< jats: italic> S. pombe microtubules< jats: sec>< jats: title> eTOC text< jats: p> To investigate coevolution of the motor-microtubule interface, we used cryo-electron microscopy to determine the near-atomic structure of the motor domain of Cut7, the fission yeast kinesin-5, bound to microtubules polymerized from natively purified fission yeast tubulin and stabilised by the drug epothilone.
DOI: 10.1021/bi0121611
发表时间: 2002-03-26
期刊: BIOCHEMISTRY
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DOI: --
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