The rapid onset of elasticity during the assembly of the bacterial cell-division protein FtsZ.

The rapid onset of elasticity during the assembly of the bacterial cell-division protein FtsZ.
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细菌细胞分裂蛋白 FtsZ 组装过程中快速产生弹性。

DOI:
10.1016/j.bbrc.2005.05.152
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发表时间:
2005
期刊:
Biochemical and biophysical research communications.
影响因子:
--
通讯作者:
Wirtz,Denis
Wirtz,Denis
中科院分区:
--
文献类型:
--
作者:
Esue,Osigwe;Tseng,Yiider;Wirtz,Denis

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FtsZ是真核微管蛋白的原核同源物,是细菌Z环的主要组成部分,在细胞分裂期间收缩细胞壁。由于FtsZ的机械性能是未知的,其在Z形环的维持和收缩中的功能还没有很好地理解。在这里,定量流变仪显示,在生理浓度下,FtsZ细丝在生理时间尺度内(1/4分钟)非常迅速地形成高度弹性的网络,比其他主要的动态细胞骨架细丝(包括真核生物中的微管、肌动蛋白和波形蛋白)快得多。FtsZ网络显示出相对低的粘度和对剪切应力的高回弹性,以及对浓度依赖性较弱的弹性,G = C0.57,与交联柔性长丝一致的幂律依赖性。钙,其细胞内浓度在细菌分裂过程中增加,通过纤维束进一步增强FtsZ网络的弹性,这种作用在GTP而不是GDP存在下发生。这些研究表明,FtsZ丝具有韧性,为细菌Z环的维持和周向收缩提供强有力的机械支持。
FtsZ, a prokaryotic homolog of eukaryotic tubulin, is a major constituent of the bacterial Z-ring, which contracts the cell wall during cell division. Because the mechanical properties of FtsZ are unknown, its function in the maintenance and constriction of the Z-ring is not well understood. Here, quantitative rheometry shows that, at physiological concentrations, FtsZ filaments form, extremely rapidly, highly elastic networks within physiological time scales (∼ minutes), much faster than other major dynamic cytoskeletal filaments, including microtubule, actin, and vimentin in eukaryotes. FtsZ networks display a relatively low viscosity and a high resilience against shear stresses, as well as an elasticity that depends weakly on concentration, G∼C0.57, a power-law dependence consistent with crosslinked flexible filaments. Calcium, whose intracellular concentration increases during bacterial division, further enhances the elasticity of FtsZ networks through filament bundling, an effect that occurs in the presence of GTP, not GDP. These studies suggest that FtsZ filaments have the toughness to provide strong mechanical support for the maintenance and circumferential constriction of the bacterial Z-ring.
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