Regulation of bacterial Type III Secretion System export gate opening

Regulation of bacterial Type III Secretion System export gate opening
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细菌III型分泌系统出口门开放的调节

DOI:
10.1101/2021.01.17.426956
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发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Bryant O
Bryant O
中科院分区:
--
文献类型:
--
作者:
Bryant O

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III型分泌系统(T3 SS)将蛋白质从细菌胞质溶胶中转运,用于组装到细胞表面纳米机器中或用于直接递送到靶真核细胞中。在鞭毛T3 SS的核心,FlhAB-FliPQR输出门调节蛋白质进入输出通道,同时保持细胞膜的完整性。在这里,我们确定了出口门FliR插头中的关键残基,其稳定了闭合构象,保持了膜渗透性屏障,并且我们表明门响应于出口底物的可用性而打开和关闭。我们的数据表明,FlhAB-FliPQR门打开,这是由基板输出信号触发,是由FlhA在质子动力依赖的方式供能。我们提出的证据表明,出口基板和鞭毛ATP酶的FliJ柄提供机械不同的,非冗余的门激活信号,是有效出口的关键。
Type III Secretion Systems (T3SS) transport proteins from the bacterial cytosol for assembly into cell surface nanomachines or for direct delivery into target eukaryotic cells. At the core of the flagellar T3SS, the FlhAB-FliPQR export gate regulates protein entry into the export channel whilst maintaining the integrity of the cell membrane. Here, we identify critical residues in the export gate FliR plug that stabilise the closed conformation, preserving the membrane permeability barrier, and we show that the gate opens and closes in response to export substrate availability. Our data indicate that FlhAB-FliPQR gate opening, which is triggered by substrate export signals, is energised by FlhA in a proton motive force-dependent manner. We present evidence that the export substrate and the FliJ stalk of the flagellar ATPase provide mechanistically distinct, non-redundant gate-activating signals that are critical for efficient export.
DOI: 10.1038/s41467-021-21143-1
发表时间: 2021-03-09
影响因子: 16.6
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期刊: --
影响因子: --
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