Streptococcus pyogenes Hijacks Host Glutathione for Growth and Innate Immune Evasion.

Streptococcus pyogenes Hijacks Host Glutathione for Growth and Innate Immune Evasion.
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化脓性链球菌为生长和先天免疫逃避提供谷胱甘肽。

DOI:
10.1128/mbio.00676-22
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发表时间:
2022-06-28
期刊:
影响因子:
6.4
通讯作者:
Walker, Mark J.
Walker, Mark J.
中科院分区:
生物学1区
文献类型:
--
作者:
Brouwer, Stephan;Jespersen, Magnus G.;Ong, Cheryl-Lynn Y.;De Oliveira, David M. P.;Keller, Bernhard;Cork, Amanda J.;Djoko, Karrera Y.;Davies, Mark R.;Walker, Mark J.

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鼻咽和皮肤是人类病原体化脓性链球菌(A组链球菌[GAS])定植的主要富氧解剖部位。为了建立感染,GAS必须在有氧代谢和宿主先天免疫细胞释放活性氧(ROS)期间产生的氧化应激中存活。谷胱甘肽是主要的宿主抗氧化分子,而GAS是谷胱甘肽营养缺陷型。在这里,我们报告的ABC转运蛋白底物结合蛋白GSHT的GAS谷胱甘肽补救途径的分子特征。我们表明,谷胱甘肽的摄取是至关重要的有氧生长的气体和受损的进口谷胱甘肽诱导氧化应激,引发增强生产的还原当量NADPH。我们的研究结果突出了谷胱甘肽同化,碳水化合物代谢,毒力因子的产生,和先天免疫逃避之间的相互关系。总之,这些研究结果表明,细胞外细菌病原体利用宿主谷胱甘肽商店为自己的利益的适应性策略。
The nasopharynx and the skin are the major oxygen-rich anatomical sites for colonization by the human pathogen Streptococcus pyogenes (group A Streptococcus [GAS]). To establish infection, GAS must survive oxidative stress generated during aerobic metabolism and the release of reactive oxygen species (ROS) by host innate immune cells. Glutathione is the major host antioxidant molecule, while GAS is glutathione auxotrophic. Here, we report the molecular characterization of the ABC transporter substrate binding protein GshT in the GAS glutathione salvage pathway. We demonstrate that glutathione uptake is critical for aerobic growth of GAS and that impaired import of glutathione induces oxidative stress that triggers enhanced production of the reducing equivalent NADPH. Our results highlight the interrelationship between glutathione assimilation, carbohydrate metabolism, virulence factor production, and innate immune evasion. Together, these findings suggest an adaptive strategy employed by extracellular bacterial pathogens to exploit host glutathione stores for their own benefit.
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