Mycolactone subverts immunity by selectively blocking the Sec61 translocon.
Mycolactone subverts immunity by selectively blocking the Sec61 translocon.
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霉菌酮通过选择性地阻断SEC61转运,从而颠覆了免疫力。
DOI:
10.1084/jem.20160662
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发表时间:
2016-12-12
期刊:
影响因子:
--
通讯作者:
Demangel C
中科院分区:
文献类型:
--
作者:
Baron L;Paatero AO;Morel JD;Impens F;Guenin-Macé L;Saint-Auret S;Blanchard N;Dillmann R;Niang F;Pellegrini S;Taunton J;Paavilainen VO;Demangel C
Baron et al. show that mycolactone, an immunosuppressive macrolide produced by the pathogen Mycobacterium ulcerans, operates by targeting the Sec61 translocon. This identifies the most potent Sec61 inhibitor reported to date and the potential of inhibiting Sec61 for immune modulation. Mycolactone, an immunosuppressive macrolide released by the human pathogen Mycobacterium ulcerans, was previously shown to impair Sec61-dependent protein translocation, but the underlying molecular mechanism was not identified. In this study, we show that mycolactone directly targets the α subunit of the Sec61 translocon to block the production of secreted and integral membrane proteins with high potency. We identify a single–amino acid mutation conferring resistance to mycolactone, which localizes its interaction site near the lumenal plug of Sec61α. Quantitative proteomics reveals that during T cell activation, mycolactone-mediated Sec61 blockade affects a selective subset of secretory proteins including key signal-transmitting receptors and adhesion molecules. Expression of mutant Sec61α in mycolactone-treated T cells rescued their homing potential and effector functions. Furthermore, when expressed in macrophages, the mycolactone-resistant mutant restored IFN-γ receptor–mediated antimicrobial responses. Thus, our data provide definitive genetic evidence that Sec61 is the host receptor mediating the diverse immunomodulatory effects of mycolactone and identify Sec61 as a novel regulator of immune cell functions.
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