Mycobacterium tuberculosis MycP1 protease plays a dual role in regulation of ESX-1 secretion and virulence.

Mycobacterium tuberculosis MycP1 protease plays a dual role in regulation of ESX-1 secretion and virulence.
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DOI:
10.1016/j.chom.2010.02.006
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发表时间:
2010-03-18
影响因子:
30.3
通讯作者:
Cox JS
Cox JS
中科院分区:
医学1区
文献类型:
--
作者:
Ohol YM;Goetz DH;Chan K;Shiloh MU;Craik CS;Cox JS

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结核分枝杆菌在感染宿主细胞期间使用 ESX-1 分泌系统传递毒力蛋白。在这里,我们报道了一种由丝氨酸蛋白酶 MycP1 介导的 ESX-1 新型转录后控制机制。我们发现 MycP1 是 ESX-1 分泌所必需的,并且具有不寻常的底物特异性。出乎意料的是,抑制蛋白酶活性会增加 ESX-1 底物的分泌。我们证明 EspB(分泌所需的 ESX-1 底物)是 MycP1 在体外和体内的靶标。在巨噬细胞感染期间,失活的 MycP1 蛋白酶突变体会导致 ESX-1 刺激的先天信号通路过度激活。 MycP1 是小鼠急性感染期间生长所必需的,而蛋白酶抑制会导致慢性感染期间毒力减弱。由于关键的 ESX-1 底物 ESAT-6 和 CFP-10 具有高度免疫原性,因此 MycP1 对其分泌进行微调可能会平衡毒力和免疫检测,并且对于成功维持长期结核分枝杆菌感染至关重要。
Mycobacterium tuberculosis uses the ESX-1 secretion system to deliver virulence proteins during infection of host cells. Here we report a novel post-transcriptional control mechanism of ESX-1 mediated by MycP1, a serine protease. We show that MycP1 is required for ESX-1 secretion and has unusual substrate specificity. Unexpectedly, inhibition of protease activity increases secretion of ESX-1 substrates. We demonstrate that EspB, an ESX-1 substrate required for secretion, is a target of MycP1 in vitro and in vivo. During macrophage infection, an inactive MycP1 protease mutant causes hyper-activation of ESX-1 stimulated innate signaling pathways. MycP1 is required for growth in mice during acute infection, while protease inhibition leads to attenuated virulence during chronic infection. As the key ESX-1 substrates ESAT-6 and CFP-10 are highly immunogenic, fine-tuning of their secretion by MycP1 may balance virulence and immune detection and be essential for successful maintenance of long-term M. tuberculosis infection.
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