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Virulence of Streptococcus pneumoniae: PsaA Mutants Are Hypersensitive to Oxidative Stress

机译:肺炎链球菌的毒力:PsaA突变体对氧化应激高度敏感。

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psaA encodes a 37-kDa pneumococcal lipoprotein which is part of an ABC Mn(II) transport complex. Streptococcus pneumoniae D39 psaA mutants have previously been shown to be significantly less virulent than wild-type D39, but the mechanism underlying the attenuation has not been resolved. In this study, we have shown that psaA and psaD mutants are highly sensitive to oxidative stress, i.e., to superoxide and hydrogen peroxide, which might explain why they are less virulent than the wild-type strain. Our investigations revealed altered expression of the key oxidative-stress response enzymes superoxide dismutase and NADH oxidase in psaA and psaD mutants, suggesting that PsaA and PsaD may play important roles in the regulation of expression of oxidative-stress response enzymes and intracellular redox homeostasis.
机译: psaA 编码一种37 kDa的肺炎球菌脂蛋白,它是ABC Mn(II)转运复合体的一部分。先前已显示肺炎链球菌 D39 psaA 突变体比野生型D39毒性低得多,但减毒的潜在机制尚未解决。在这项研究中,我们表明 psaA psaD 突变体对氧化应激(即对超氧化物和过氧化氢)高度敏感,这可能解释了为什么它们的毒性不如野生型菌株。我们的研究表明, psaA psaD 突变体中关键氧化应激反应酶超氧化物歧化酶和NADH氧化酶的表达发生了变化,这表明PsaA和PsaD可能在调控中起重要作用氧化应激反应酶的表达与细胞内氧化还原稳态的关系

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