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A microtubule-binding myosin required for nuclear anchoring and spindle assembly

机译:核锚定和纺锤体组装所需的微管结合肌球蛋白

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Proper spindle positioning and orientation are essential for asymmetric cell division and require microtubule-actin filament (F-actin) interactions in many systems(1,2). Such interactions are particularly important in meiosis(3), where they mediate nuclear anchoring(4-6), as well as meiotic spindle assembly and rotation(7,8), two processes required for asymmetric cell division. Myosin-10 proteins are phosphoinositide-binding(9), actin-based motors that contain carboxy-terminal MyTH4 and FERM domains of unknown function(10). Here we show that Xenopus laevis myosin-10 (Myo10) associates with microtubules in vitro and in vivo, and is concentrated at the point where the meiotic spindle contacts the F-actin-rich cortex. Microtubule association is mediated by the MyTH4-FERM domains, which bind directly to purified microtubules. Disruption of Myo10 function disrupts nuclear anchoring, spindle assembly and spindle-F-actin association. Thus, this myosin has a novel and critically important role during meiosis in integrating the F- actin and microtubule cytoskeletons.
机译:正确的纺锤定位和定向对于不对称细胞分裂至关重要,并且在许多系统中都需要微管-肌动蛋白丝(F-actin)相互作用(1,2)。这种相互作用在减数分裂(3)中尤其重要,它们介导核锚定(4-6)以及减数分裂纺锤体组装和旋转(7,8),这是不对称细胞分裂的两个过程。 Myosin-10蛋白是磷酸肌醇结合蛋白(9),是基于肌动蛋白的运动蛋白,包含功能未知的羧基末端MyTH4和FERM结构域(10)。在这里,我们显示非洲爪蟾(Xenopus laevis)肌球蛋白10(Myo10)在体外和体内与微管相关,并且集中在减数分裂纺锤体接触富F-肌动蛋白皮层的位置。微管缔合是由MyTH4-FERM域介导的,该域直接与纯化的微管结合。 Myo10功能的破坏会破坏核锚定,纺锤体组装和纺锤体-F-肌动蛋白缔合。因此,该肌球蛋白在减数分裂过程中在整合F-肌动蛋白和微管细胞骨架中具有新颖而至关重要的作用。

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