Cryo-EM structure of the exocyst complex.

Cryo-EM structure of the exocyst complex.
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DOI:
10.1038/s41594-017-0016-2
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发表时间:
2018-03
影响因子:
16.8
通讯作者:
Guo W
Guo W
中科院分区:
生物学1区
文献类型:
--
作者:
Mei K;Li Y;Wang S;Shao G;Wang J;Ding Y;Luo G;Yue P;Liu JJ;Wang X;Dong MQ;Wang HW;Guo W

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The exocyst is an evolutionarily conserved octameric protein complex that mediates the tethering of post-Golgi secretory vesicles to the plasma membrane during exocytosis, and is implicated in many cellular processes such as cell polarization, cytokinesis, ciliogenesis and tumor invasion. Using cryo-electron microscopy (cryo-EM) and chemical cross-linking mass spectrometry (CXMS), we solved the structure of the Saccharomyces cerevisiae exocyst complex at an average resolution of 4.4 Å. Our model revealed the architecture of the exocyst, and led to the identification of the helical bundles that mediate the assembly of the complex at its core. Sequence analysis suggests that these regions are evolutionarily conserved across eukaryotic systems. Further cell biological studies suggest a mechanism for exocyst assembly that leads to vesicle tethering at the plasma membrane.
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