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Genetic engineering of AtAOX1a in Saccharomyces cerevisiae prevents oxidative damage and maintains redox homeostasis

机译:酿酒酵母中 AtAOX1a 的基因工程可防止氧化损伤并维持氧化还原稳态

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This study aimed to validate the physiological importance of Arabidopsis thaliana alternative oxidase 1a (At AOX 1a) in alleviating oxidative stress using Saccharomyces cerevisiae as a model organism. The AOX 1a transformant ( pYES 2At AOX 1a) showed cyanide resistant and salicylhydroxamic acid ( SHAM )‐sensitive respiration, indicating functional expression of AtAOX1a in S. cerevisiae . After exposure to oxidative stress, pYES2At AOX 1a showed better survival and a decrease in reactive oxygen species ( ROS ) when compared to S. cerevisiae with empty vector (pYES2). Furthermore, pYES2At AOX 1a sustained growth by regulating GPX 2 and/or TSA 2, and cellular NAD +/ NADH ratio. Thus, the expression of At AOX 1a in S. cerevisiae enhances its respiratory tolerance which, in turn, maintains cellular redox homeostasis and protects from oxidative damage.
机译:这项研究旨在验证拟南芥替代氧化酶1a(在AOX 1a)在使用酿酒酵母作为模型生物缓解氧化应激中的生理重要性。 AOX 1a转化子(pYES 2At AOX 1a)显示出抗氰化物和水杨基异羟肟酸(SHAM)敏感的呼吸作用,表明AtAOX1a在酿酒酵母中的功能表达。暴露于氧化应激后,与带有空载体的酿酒酵母(pYES2)相比,pYES2At AOX 1a表现出更好的存活率,并且活性氧含量(ROS)降低。此外,pYES2At AOX 1a通过调节GPX 2和/或TSA 2以及细胞NAD + / NADH比值而持续生长。因此,酿酒酵母中At AOX 1a的表达增强了其呼吸耐受性,继而维持了细胞氧化还原稳态并保护其免受氧化损伤。

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