Malaria parasite translocon structure and mechanism of effector export.

Malaria parasite translocon structure and mechanism of effector export.
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DOI:
10.1038/s41586-018-0469-4
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发表时间:
2018-09
期刊:
影响因子:
64.8
通讯作者:
Zhou ZH
Zhou ZH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ho CM;Beck JR;Lai M;Cui Y;Goldberg DE;Egea PF;Zhou ZH

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推测的疟原虫转运蛋白(PTEX)是必需的疟疾效应蛋白运输穿过寄生虫包裹的空泡膜进入宿主红细胞,但这一过程的机制仍然未知。在这里,我们通过确定EXP 2,PTEX 150和HSP 101的内源性PTEX核心复合物的近原子分辨率cryoEM结构来显示PTEX是真正的易位子,所述内源性PTEX核心复合物从恶性疟原虫中分离,处于与CRISPR/Cas9工程化表位标签的内源性货物易位的接合和重置状态。EXP 2和PTEX 150相互交错,形成一个静态的,漏斗形的假七重对称蛋白质传导通道跨越液泡膜。螺旋形AAA+ HSP 101六聚体被拴在这个漏斗上方,经历了一个戏剧性的压缩,允许HSP 101通道内衬的六个酪氨酸承载孔环中的三个与货物解离,重新设置了下一个穿线循环的易位子。我们的工作揭示了恶性疟原虫效应子输出的机制,使得基于结构的药物设计能够靶向这种独特的易位子。
The putative Plasmodium Translocon of Exported Proteins (PTEX) is essential for transport of malarial effector proteins across a parasite-encasing vacuolar membrane into host erythrocytes, but the mechanism of this process remains unknown. Here we show PTEX is a bona fide translocon by determining near-atomic resolution cryoEM structures of the endogenous PTEX core complex of EXP2, PTEX150 and HSP101, isolated from Plasmodium falciparum in the engaged and resetting states of endogenous cargo translocation with CRISPR/Cas9-engineered epitope tags. EXP2 and PTEX150 interdigitate to form a static, funnel-shaped pseudo-sevenfold symmetric protein-conducting channel spanning the vacuolar membrane. Tethered above this funnel, the spiral-shaped AAA+ HSP101 hexamer undergoes a dramatic compaction that allows three of six tyrosine-bearing pore loops lining the HSP101 channel to dissociate from the cargo, resetting the translocon for the next threading cycle. Our work reveals the mechanism of P. falciparum effector export, enabling structure-based design of drugs targeting this unique translocon.
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