Dynamin-like proteins mediate extracellular vesicle secretion in Mycobacterium tuberculosis.

Dynamin-like proteins mediate extracellular vesicle secretion in Mycobacterium tuberculosis.
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动力蛋白样蛋白介导结核分枝杆菌胞外囊泡分泌。

DOI:
10.15252/embr.202255593
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发表时间:
2023-06-05
期刊:
影响因子:
7.7
通讯作者:
Rodriguez, G. Marcela
Rodriguez, G. Marcela
中科院分区:
生物学2区
文献类型:
--
作者:
Gupta, Shamba;Bhagavathula, Madhuri;Sharma, Vartika;Sharma, Nishant;Sharma, Nevadita;Biswas, Ashis;Palacios, Ainhoa;Salgueiro, Vivian;Lavin, Jose L.;Dogra, Navneet;Salgame, Padmini;Prados-Rosales, Rafael;Rodriguez, G. Marcela

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结核分枝杆菌(Mtb)分泌含有多种蛋白质、脂蛋白和脂聚糖的细胞外囊泡(EV)。虽然新出现的证据表明,EV有助于结核病的发病机制,涉及分枝杆菌EV生产的因素和分子机制尚未确定。在这项研究中,我们使用遗传学方法来确定介导小泡释放的结核分枝杆菌蛋白质,以响应铁限制和抗生素暴露。我们发现了异烟肼诱导的发动蛋白样蛋白,ESTAIA和ESTAIC在分枝杆菌EV生物发生中的关键作用。Mtb iniA突变体的进一步表征显示EV的产生使得细胞内Mtb能够将细菌组分输出到细胞外环境中以与宿主细胞通信并潜在地调节免疫应答。这些发现推进了我们对分枝杆菌EV的生物起源和功能的理解,并为体内靶向囊泡生产提供了途径。铁调节的发动蛋白样蛋白MAGNETAC促进结核分枝杆菌细胞外囊泡的产生和释放。
Mycobacterium tuberculosis (Mtb) secretes extracellular vesicles (EVs) containing a variety of proteins, lipoproteins, and lipoglycans. While emerging evidence suggests that EVs contribute to tuberculosis pathogenesis, the factors and molecular mechanisms involved in mycobacterial EV production have not been identified. In this study, we use a genetic approach to identify Mtb proteins that mediate vesicle release in response to iron limitation and antibiotic exposure. We uncover a critical role for the isoniazid‐induced, dynamin‐like proteins, IniA and IniC, in mycobacterial EV biogenesis. Further characterization of a Mtb iniA mutant shows that the production of EVs enables intracellular Mtb to export bacterial components into the extracellular environment to communicate with host cells and potentially modulate the immune response. The findings advance our understanding of the biogenesis and functions of mycobacterial EVs and provide an avenue for targeting vesicle production in vivo. The iron‐regulated, dynamin‐like proteins IniAC promote the production and release of extracellular vesicles from Mycobacterium tuberculosis.
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