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His18 promotes reactive oxidative stress production in copper-ion mediated human islet amyloid polypeptide aggregation

机译:HIS18促进铜离子介导人胰岛淀粉样蛋白多肽聚集体中的反应性氧化应激产生

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摘要

Copper ions play a critical role in human islet amyloid polypeptide (hIAPP) aggregation, which has been found in more than 90% of patients with type-2 diabetes (T2D). The role of Cu(ii) in the cell cytotoxicity with hIAPP has been explored in two aspects: inhibiting the formation of fibrillar structures and stimulating the generation of reactive oxygen species (ROS). In this work, we carried out spectroscopic studies of Cu(ii) interacting with several hIAPP fragments and their variants as well. Electron paramagnetic resonance (EPR) measurements and Amplex Red analysis showed that the amount of H2O2 generated in hIAPP(11-28) solution co-incubated with Cu(ii) was remarkably more than hIAPP(1-11) and hIAPP(28-37). Furthermore, the H2O2 level was seriously reduced when His18 of hIAPP(11-28) was replaced by Arg(R) or Ser(S), indicating that His18 is the key residue of Cu(ii) binding to hIAPP(11-28) to promote H2O2 generation. This is likely because the donation of electrons from the peptide to Cu(ii) ions would result in the formation of the redox-active complexes, which could stimulate the formation of H2O2. Overall, this study provides further insight into the molecular mechanism of Cu(ii) induced ROS generation.
机译:铜离子在人类胰岛淀粉样多肽(hIAPP)聚合中起关键作用,这在患者的90%以上的被发现与2型糖尿病(T2D)。铜(II)的与所述hIAPP细胞的细胞毒性中的作用已探索在两个方面:抑制原纤维结构的形成,刺激反应性氧物质(ROS)的产生。在这项工作中,我们进行了铜(II)相互作用的光谱研究与几个hIAPP片段及其变体为好。电子顺磁共振(EPR)测量和Amplex Red试分析表明,在hIAPP产生的H 2 O 2的量(11-28)溶液共同温育的Cu(II)显着地是多于hIAPP(1-11)和hIAPP(28-37 )。此外,当(11-28)hIAPP的His18被精氨酸(R)或Ser(S)置换,表明His18是Cu的关键残基上的H 2 O 2水平严重降低(ⅱ)结合hIAPP(11-28)促进过氧化氢的产生。这可能是因为(II)离子将导致氧化还原活性复合物,其能刺激H2O2的形成的形成电子从肽到的Cu的捐赠。总之,该研究提供了进一步的深入了解的Cu(II)诱导的ROS产生的分子机制。

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  • 来源
    《RSC Advances》 |2020年第10期|共6页
  • 作者单位

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

    Chinese Acad Sci Shanghai Adv Res Inst Beijing Peoples R China;

    Chinese Acad Sci Shanghai Adv Res Inst Beijing Peoples R China;

    Univ Georgia Coll Engn Single Mol Study Lab Athens GA 30602 USA;

    Ningbo Univ Sch Phys Sci &

    Technol Ningbo Zhejiang Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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