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SUN/KASH interactions facilitate force transmission across the nuclear envelope

机译:SUN / KASH相互作用有助于力传递穿过核包膜

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摘要

LINC complexes (Linker of Nucleoskeleton and Cytoskeleton), consisting of inner nuclear membrane SUN (Sad1, UNC-84) proteins and outer nuclear membrane KASH (Klarsicht, ANC-1, and Syne Homology) proteins, are essential for nuclear positioning, cell migration and chromosome dynamics. To test the in vivo functions of conserved interfaces revealed by crystal structures, Cain et al used a combination of Caenorhabditis elegans genetics, imaging in cultured NIH 3T3 fibroblasts, and Molecular Dynamic simulations, to study SUN-KASH interactions. Conserved aromatic residues at the -7 position of the C-termini of KASH proteins and conserved disulfide bonds in LINC complexes play important roles in force transmission across the nuclear envelope. Other properties of LINC complexes, such as the helices preceding the SUN domain, the longer coiled-coils spanning the perinuclear space and higher-order organization may also function to transmit mechanical forces generated by the cytoskeleton across the nuclear envelope.
机译:由内核膜SUN(Sad1,UNC-84)蛋白和外核膜KASH(Klarsicht,ANC-1和Syne Homology)蛋白组成的LINC复合物(核骨架和细胞骨架的连接子)对于核定位,细胞迁移至关重要。和染色体动力学。为了测试晶体结构揭示的保守界面的体内功能,Cain等人使用秀丽隐杆线虫遗传学,在培养的NIH 3T3成纤维细胞中成像以及分子动力学模拟的组合,来研究SUN-KASH相互作用。 KASH蛋白C末端-7位的保守芳香族残基和LINC络合物中保守的二硫键在跨核被膜的力传递中起重要作用。 LINC配合物的其他特性,例如SUN域之前的螺旋,跨越核周空间的较长螺旋线圈以及更高阶的组织,也可能起到将细胞骨架产生的机械力跨核包膜传递的作用。

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