Motor and cargo interactions.

Motor and cargo interactions.
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电机和货物的相互作用。

DOI:
10.1046/j.1432-1327.1999.00340.x
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发表时间:
1999
期刊:
European journal of biochemistry
影响因子:
--
通讯作者:
Sheetz,MP
Sheetz,MP
中科院分区:
--
文献类型:
--
作者:
Sheetz,MP

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细胞内货物沿着微管在细胞内的运动通常是跳跃式的或持续时间短。此外,在任何时期移动的膜囊泡的分数的计算表明,主动运动复合体是罕见的。从细胞内正常囊泡运输的观察来看,似乎存在位置依赖性的马达激活以及向内和向外方向的运输平衡。在许多条件下观察到马达与货物的体外结合,但运动性不是。多组分复合物似乎通过高度定位于细胞中的分级激活系统参与产生活跃的细胞器运动。细胞器运动复合体的运动性激活的基础仍然是未知的,但磷酸化已涉及许多系统。在运动结合蛋白kinectin的情况下,它与由传统驱动蛋白驱动的主动细胞器运动有关。根据kinectin的卷曲螺旋结构和kinesin的卷曲螺旋尾部,推测卷曲螺旋组装体负责结合相互作用。许多其他货物运输,但运输的控制将定制为每个功能,如轴丝筏或细胞骨架复合体。每个功能都必须单独分析,运动活动需要整合到功能的特定方面。
The movements of intracellular cargo along microtubules within cells are often saltatory or of short duration. Further, calculations of the fraction of membrane vesicles that are moving at any period, indicate that active motor complexes are rare. From observations of normal vesicle traffic in cells, there appears to be position‐dependent activation of motors and a balance of traffic in the inward and outward directions.In‐vitrobinding of motors to cargo is observed under many conditions but motility is not. Multi‐component complexes appear to be involved in producing active organelle movements by a graded activation system that is highly localized in the cell. The basis of the activation of motility of the organelle motor complexes is still unknown but phosphorylation has been implicated in many systems. In the case of the motor‐binding protein, kinectin, it has been linked to active organelle movements powered by conventional kinesin. From the coiled‐coil structure of kinectin and the coiled‐coil tail of kinesin, it is postulated that a coiled‐coil assembly is responsible for the binding interaction. Many other cargoes are transported but the control of transport will be customized for each function, such as axonemal rafts or cytoskeletal complexes. Each function will have to be analyzed separately and motor activity will need to be integrated into the specific aspects of the function.
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