The Type VI Secretion System Engages a Redox-Regulated Dual-Functional Heme Transporter for Zinc Acquisition.

The Type VI Secretion System Engages a Redox-Regulated Dual-Functional Heme Transporter for Zinc Acquisition.
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VI 型分泌系统利用氧化还原调节的双功能血红素转运蛋白来获取锌。

DOI:
10.1016/j.celrep.2017.06.081
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发表时间:
2017-07
期刊:
Cell Rep
影响因子:
--
通讯作者:
Shen X
Shen X
中科院分区:
其他
文献类型:
--
作者:
Si M;Wang Y;Zhang B;Zhao C;Kang Y;Bai H;Wei D;Zhu L;Zhang L;Dong TG;Shen X

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最近有报道称 VI 型分泌系统参与锌的获取,但其潜在机制仍不清楚。在这里,我们报道泰国伯克霍尔德氏菌 T6SS4 通过分泌锌清除蛋白 TseZ 参与锌获取,TseZ 与外膜血红素转运蛋白 HmuR 相互作用。我们发现 HmuR 是一种氧化还原调节的双功能转运蛋白,在正常条件下转运血红素铁,但在感知细胞外氧化应激(由分子内二硫键的形成触发)时转运锌。作为对抗氧化应激的第一道防线,HmuR 不仅保证对不断变化的环境做出立即反应,而且还提供了一种微调机制,允许对感知到的压力进行逐步反应。 T6SS/HmuR 介导的活性锌转运系统还参与细菌毒力和不依赖于接触的细菌竞争。我们描述了一种复杂的细菌锌获取机制,为金属离子传输系统的作用提供了见解。
The type VI secretion system was recently reported to be involved in zinc acquisition, but the underlying mechanism remains unclear. Here, we report thatBurkholderia thailandensisT6SS4 is involved in zinc acquisition via secretion of a zinc-scavenging protein, TseZ, that interacts with the outer membrane heme transporter HmuR. We find that HmuR is a redox-regulated dual-functional transporter that transports heme iron under normal conditions but zinc upon sensing extracellular oxidative stress, triggered by formation of an intramolecular disulfide bond. Acting as the first line of defense against oxidative stress, HmuR not only guarantees an immediate response to the changing environment but also provides a fine-tuned mechanism that allows a gradual response to perceived stress. The T6SS/HmuR-mediated active zinc transport system is also involved in bacterial virulence and contact-independent bacterial competition. We describe a sophisticated bacterial zinc acquisition mechanism affording insights into the role of metal ion transport systems.
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