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Fixed-angle rotor A-110

Company: Beckman Coulter
Catalog#: 347596
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Microtubule Seeded-assembly in the Presence of Poorly Nucleating Nucleotide Analogues
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2020-08-20
[Abstract]  Microtubule dynamic instability is driven by the hydrolysis of the GTP bound to the β-subunit of the α-β tubulin heterodimer. Nucleotide analogues are commonly used to mimic the different steps of the tubulin GTPase cycle, but most of them are poor microtubule nucleators. Usually, microtubule assembly is seeded by guanylyl-(α, β)-methylene-diphosphonate (GMPCPP) or glycerol that can be limiting factors in monitoring the effect of other nucleotide analogs on their polymerization. Here, we describe a protocol that allows the assembly of microtubules in the presence of nucleotide analogues without the need of heterogeneous seeds and at a low final glycerol concentration. Microtubules are first assembled in the presence of the analogue of interest and glycerol to promote assembly. These ... [摘要]  [摘要 ] 微管动态不稳定性是由与α - β 微管蛋白异二聚体的β- 亚基结合的GTP水解驱动的。核苷酸类似物通常用于模拟微管蛋白GTPase循环的不同步骤,但其中大多数是不良的微管成核剂。通常,微管组装是通过胍基-(α ,β )-亚甲基-二膦酸酯(GMPCPP)或甘油来接种的,它们可能是限制其他核苷酸类似物对其聚合作用的监测因素。 在这里,我们描述了一种协议,该协议允许在核苷酸类似物存在的情况下组装微管,而无需异质种子,并且最终甘油浓度低。首先在感兴趣的类似物和甘油的存在下组装微管以促进组装。然后对这些微管进行超声处理,以产生种子,这些种子将在不存在甘油的情况下用于组装微管。这种策略产生了均质的核苷酸结合的微管,可以通过生化或结构方法(如冷冻电子显微镜)进一步分析。

[背景 ] 核苷酸类似物通常用于研究的构象变化,该α - β 微管组装和水解绑定到其可交换的(E)的网站上的GTP的期间微管蛋白异源二聚体经历。但是,除GMPCPP以外,大多数类似物都是微管成核剂。为克服这一困难,GMPCPP稳定化的种子通常用于存在其他类似物的情况下延长微管(Maurer 等人,2011和2014; Zhang ...

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