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.
中科院分区:
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.
关键词:
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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