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首页> 外文期刊>Journal of cell biology >Lattice defects in microtubules: protofilament numbers vary within individual microtubules
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Lattice defects in microtubules: protofilament numbers vary within individual microtubules

机译:微管中的晶格缺陷:原丝数目在单个微管中有所不同

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We have used cryo-electron microscopy of vitrified specimens to study microtubules assembled both from three cycle purified tubulin (3x-tubulin) and in cell free extracts of Xenopus eggs. In vitro assembled 3x-tubulin samples have a majority of microtubules with 14 protofilaments whereas in cell extracts most microtubules have 13 protofilaments. Microtubule polymorphism was observed in both cases. The number of protofilaments can change abruptly along individual microtubules usually by single increments but double increments also occur. For 3x-tubulin, increasing the magnesium concentration decreases the proportion of 14 protofilament microtubules and decreases the average separation between transitions in these microtubules. Protofilament discontinuities may correspond to dislocation-like defects in the microtubule surface lattice.
机译:我们已经使用了玻璃化标本的冷冻电子显微镜来研究由三周期纯化微管蛋白(3x-微管蛋白)和非洲爪蟾卵的无细胞提取物中组装的微管。在体外组装的3x-微管蛋白样品中,大多数微管具有14条原丝,而在细胞提取物中,大多数微管具有13条原丝。在两种情况下均观察到微管多态性。原丝的数量可以沿着单个微管突然变化,通常以单次增量变化,但也会出现双倍增量。对于3x-微管蛋白,增加镁的浓度会降低14个原丝微管的比例,并减少这些微管中各转移之间的平均间隔。原丝不连续性可能对应于微管表面晶格中的位错样缺陷。

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