The mechanics of FtsZ fibers.

The mechanics of FtsZ fibers.
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FtsZ 纤维的力学。

DOI:
10.1016/j.bpj.2012.01.015
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发表时间:
2012
影响因子:
3.4
通讯作者:
Turner DJ
Turner DJ
中科院分区:
生物学3区
文献类型:
--
作者:
Turner DJ

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抑制FTS蛋白家族会导致长丝状细胞的生长,这表明它们在细胞分裂中发挥了一定的作用。FtsZ聚合成原丝,并在细胞分裂隔膜的未来位置组装成Z-环。利用低温电子显微镜对GTP结合的FtsZ原丝的弯曲起伏进行了分析。我们发现FtsZ-GTP灯丝的硬度为Nm2,相应的热持续长度为μm,远高于先前的估计。结合其他模型研究,我们对FtsZ刚性的新的更高估计表明,Z环的收缩可能产生足够的力来促进细胞分裂。测量的模振幅与能量均分预测的模振幅之间的良好一致性支持我们对FtsZ光纤使用一个简单的力学模型。这项研究还提供了证据,证明纤维没有内在的全局或局部曲率,例如可能是由于GTP的部分水解造成的。
Inhibition of the Fts family of proteins causes the growth of long filamentous cells, indicating that they play some role in cell division. FtsZ polymerizes into protofilaments and assembles into the Z-ring at the future site of the septum of cell division. We analyze the rigidity of GTP-bound FtsZ protofilaments by using cryoelectron microscopy to sample their bending fluctuations. We find that the FtsZ-GTP filament rigidity isNm2, with a corresponding thermal persistence length ofμm, much higher than previous estimates. In conjunction with other model studies, our new higher estimate for FtsZ rigidity suggests that contraction of the Z-ring may generate sufficient force to facilitate cell division. The good agreement between the measured mode amplitudes and that predicted by equipartition of energy supports our use of a simple mechanical model for FtsZ fibers. The study also provides evidence that the fibers have no intrinsic global or local curvatures, such as might be caused by partial hydrolysis of the GTP.
镰状血红蛋白纤维之间的相互作用。
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期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
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