Analysis of mutants disrupted in bacillithiol metabolism in Staphylococcus aureus.

Analysis of mutants disrupted in bacillithiol metabolism in Staphylococcus aureus.
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DOI:
10.1016/j.bbrc.2013.04.027
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发表时间:
2013-06-28
影响因子:
3.1
通讯作者:
Rawat, Mamta
Rawat, Mamta
中科院分区:
生物学4区
文献类型:
--
作者:
Rajkarnikar, Arishma;Strankman, Andrew;Duran, Shayla;Vargas, Derek;Roberts, Alexandra A.;Barretto, Kathryn;Upton, Heather;Hamilton, Christopher J.;Rawat, Mamta

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Bacillithiol (BSH)是一种l-半胱氨酸- d -葡萄糖氨基- l-苹果酸酯的α-头聚糖糖苷,是一种主要的低分子量硫醇,存在于低GC革兰氏阳性细菌中,如金黄色葡萄球菌。像其他低分子量的硫醇一样,BSH可能参与抵抗许多压力的保护。我们检测了金黄色葡萄球菌转座子突变体中与BSH生物合成相关的三个基因中的每一个都被破坏。这些突变体对烷基化应激、氧化应激和金属应激敏感,表明BSH和BSH依赖性酶参与了金黄色葡萄球菌的保护。我们进一步证明了BshB,一种参与BSH生物合成第二步的去乙酰化酶,也作为BSH偶联氨基酶,并鉴定了金黄色葡萄球菌USA 300 LAC 2626是一种BSH- s -转移酶,它能够将氯二硝基苯、蓝绿蛋白和利福霉素偶联到BSH。
Bacillithiol (BSH), an α-anomeric glycoside of L-cysteinyl-D-glucosaminyl-L-malate, is a major low molecular weight thiol found in low GC Gram-positive bacteria, such as Staphylococcus aureus. Like other low molecular weight thiols, BSH is likely involved in protection against a number of stresses. We examined S. aureus transposon mutants disrupted in each of the three genes associated with BSH biosynthesis. These mutants are sensitive to alkylating stress, oxidative stress, and metal stress indicating that BSH and BSH-dependent enzymes are involved in protection of S. aureus. We further demonstrate that BshB, a deacetylase involved in the second step of BSH biosynthesis, also acts as a BSH conjugate amidase and identify S. aureus USA 300 LAC 2626 as a BSH-S-transferase, which is able to conjugate chlorodinitrobenzene, cerulenin, and rifamycin to BSH.
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期刊: BIOCHEMISTRY
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期刊: BIOCHEMISTRY
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