GTPase activity-coupled treadmilling of the bacterial tubulin FtsZ organizes septal cell wall synthesis.

GTPase activity-coupled treadmilling of the bacterial tubulin FtsZ organizes septal cell wall synthesis.
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DOI:
10.1126/science.aak9995
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发表时间:
2017-02-17
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Xiao J
Xiao J
中科院分区:
其他
文献类型:
--
作者:
Yang X;Lyu Z;Miguel A;McQuillen R;Huang KC;Xiao J

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细菌微管蛋白FtsZ是细胞分裂机制的核心组成部分,协调参与间隔细胞壁合成的蛋白质集合,以确保成功收缩。细胞如何实现这种协调尚不清楚。我们发现,在大肠杆菌细胞中,FtsZ表现出动态的跑步运动,这主要取决于它的鸟苷三磷酸酶活性。跑步动力学指导间隔细胞壁合成机制的进程运动,但不限制间隔合成的速率。在跑步严重减少的FtsZ突变体中,间隔合成的空间分布、间隔细胞壁的分子组成和超微结构都发生了很大的变化。因此,FtsZ跑步提供了一种机制,实现均匀的间隔细胞壁合成,以实现正确的极性形态。
The bacterial tubulin FtsZ is the central component of the cell division machinery, coordinating an ensemble of proteins involved in septal cell wall synthesis to ensure successful constriction. How cells achieve this coordination is unknown. We found that in Escherichia coli cells, FtsZ exhibits dynamic treadmilling predominantly determined by its guanosine triphosphatase activity. The treadmilling dynamics direct the processive movement of the septal cell wall synthesis machinery but do not limit the rate of septal synthesis. In FtsZ mutants with severely reduced treadmilling, the spatial distribution of septal synthesis and the molecular composition and ultrastructure of the septal cell wall were substantially altered. Thus, FtsZ treadmilling provides a mechanism for achieving uniform septal cell wall synthesis to enable correct polar morphology.
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