Zn2+ decoration of microtubules arrests axonal transport and displaces tau, doublecortin, and MAP2C.

Zn2+ decoration of microtubules arrests axonal transport and displaces tau, doublecortin, and MAP2C.
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微管的Zn 2+装饰阻止轴突运输并取代tau、doublecortin和MAP2C。

DOI:
10.1083/jcb.202208121
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发表时间:
2023-08-07
影响因子:
7.8
通讯作者:
Qin, Yan
Qin, Yan
中科院分区:
生物学1区
文献类型:
--
作者:
Minckley, Taylor F.;Salvagio, Lyndsie A.;Fudge, Dylan H.;Verhey, Kristen;Markus, Steven M.;Qin, Yan

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Minckley等人发现了一种依赖于Zn2+的机制,可以调节基于微管的过程,其中Zn2+修饰微管通过直接抑制运动蛋白的运动和调节双皮质素(DCX)、tau和MAP2C的微管结合来干扰轴突运输,而不会干扰其他map。细胞内Zn2+浓度通过去极化介导的内流或细胞内释放增加,但Zn2+信号对神经元功能的直接影响尚不完全清楚。通过同时记录细胞质Zn2+和细胞器运动,我们发现Zn2+ (IC50≈5-10 nM)升高降低了大鼠海马神经元和HeLa细胞的溶酶体和线粒体运动。使用活细胞共聚焦显微镜和体外单分子TIRF成像,我们发现Zn2+抑制运动蛋白(kinesin和dynein)的活性,而不破坏它们的微管结合。相反,Zn2+直接结合微管并选择性地促进tau、DCX和MAP2C的分离,但不促进MAP1B、MAP4、MAP7、MAP9或p150glue的分离。生物信息学预测和结构建模表明,微管上的Zn2+结合位点与tau、DCX、动力蛋白和动力蛋白的微管结合位点部分重叠。我们的研究结果表明,神经元内Zn2+通过与微管相互作用调节轴突运输和基于微管的过程。
Minckley et al. identify a Zn2+-dependent mechanism that regulates microtubule-based processes, in which microtubule decoration by Zn2+ disturbs axonal transport via directly inhibiting movement of motor proteins and regulating microtubule binding of doublecortin (DCX), tau, and MAP2C, without disrupting other MAPs. Intracellular Zn2+ concentrations increase via depolarization-mediated influx or intracellular release, but the immediate effects of Zn2+ signals on neuron function are not fully understood. By simultaneous recording of cytosolic Zn2+ and organelle motility, we find that elevated Zn2+ (IC50 ≈ 5–10 nM) reduces both lysosomal and mitochondrial motility in primary rat hippocampal neurons and HeLa cells. Using live-cell confocal microscopy and in vitro single-molecule TIRF imaging, we reveal that Zn2+ inhibits activity of motor proteins (kinesin and dynein) without disrupting their microtubule binding. Instead, Zn2+ directly binds to microtubules and selectively promotes detachment of tau, DCX, and MAP2C, but not MAP1B, MAP4, MAP7, MAP9, or p150glued. Bioinformatic predictions and structural modeling show that the Zn2+ binding sites on microtubules partially overlap with the microtubule binding sites of tau, DCX, dynein, and kinesin. Our results reveal that intraneuronal Zn2+ regulates axonal transport and microtubule-based processes by interacting with microtubules.
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