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microtubule (微管)

名词解释题
2022-01-03 00:02
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是直径为24-26nm的中空圆柱体。外径平均为24nm,内径为15nm。微管壁大约厚5nm,微管通常是直的,但有时也呈弧形。细胞内微管呈网状和束状分布,并能与其他蛋白共同组装成纺锤体、基粒、中心粒、纤毛、鞭毛、轴突、神经管等结构。
微管是由微管蛋白异源二聚体为基本构件,螺旋盘绕形成微管的壁。在每根微管中微管蛋白二聚体头尾相接,形成细长的原纤维(protofilament),13条这样的原纤维纵向排列组成微管的壁。


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microtubule (微管)
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