Specificity of Human Sulfiredoxin for Reductant and Peroxiredoxin Oligomeric State.

Specificity of Human Sulfiredoxin for Reductant and Peroxiredoxin Oligomeric State.
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DOI:
10.3390/antiox10060946
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发表时间:
2021-06-11
期刊:
Antioxidants (Basel, Switzerland)
影响因子:
--
通讯作者:
Lowther WT
Lowther WT
中科院分区:
其他
文献类型:
--
作者:
Forshaw TE;Reisz JA;Nelson KJ;Gumpena R;Lawson JR;Jönsson TJ;Wu H;Clodfelter JE;Johnson LC;Furdui CM;Lowther WT

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人过氧化物酶(Peroxiredoxins,Prx)是一个抗氧化酶家族,参与多种细胞功能和疾病。在与过氧化物(例如,H2 O2)时,典型的2-Cys Prx在高级(do)十聚体和二硫键连接的二聚体之间改变寡聚体结构,其中过氧化的失活状态(-SO2 H)有利于还原酶的多聚体结构。在这里,我们提出了一个研究的结构要求修复超氧化的2-Cys Prxs的人sulfiredoxin(Srx)和生理还原剂硫化氢(H2S)和谷胱甘肽(GSH)在这个反应中的相对功效。环形Prx 1-Srx复合物的晶体结构显示出扩展的活性位点界面。工程化Prx 2和Prx 3二聚体中该界面的丢失产生了对Srx的过氧化和修复更具抗性的变体。最后,我们首次揭示了Prx异构体依赖的使用和GSH和H2S之间的潜在合作,以支持Srx的活动。
Human peroxiredoxins (Prx) are a family of antioxidant enzymes involved in a myriad of cellular functions and diseases. During the reaction with peroxides (e.g., H2O2), the typical 2-Cys Prxs change oligomeric structure between higher order (do)decamers and disulfide-linked dimers, with the hyperoxidized inactive state (-SO2H) favoring the multimeric structure of the reduced enzyme. Here, we present a study on the structural requirements for the repair of hyperoxidized 2-Cys Prxs by human sulfiredoxin (Srx) and the relative efficacy of physiological reductants hydrogen sulfide (H2S) and glutathione (GSH) in this reaction. The crystal structure of the toroidal Prx1-Srx complex shows an extended active site interface. The loss of this interface within engineered Prx2 and Prx3 dimers yielded variants more resistant to hyperoxidation and repair by Srx. Finally, we reveal for the first time Prx isoform-dependent use of and potential cooperation between GSH and H2S in supporting Srx activity.
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