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An oxidative N-demethylase reveals PAS transition from ubiquitous sensor to enzyme

机译:氧化性N-脱甲基酶揭示PAS从普遍存在的传感器转变为酶

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摘要

The universal Per-ARNT-Sim (PAS) domain functions as a signal transduction module involved in sensing diverse stimuli such as small molecules, light, redox state and gases(1,2). The highly evolvable PAS scaffold can bind a broad range of ligands, including haem, flavins and metal ions. However, although these ligands can support catalytic activity, to our knowledge no enzymatic PAS domain has been found. Here we report characterization of the first PAS enzyme: a haem-dependent oxidative N-demethylase. Unrelated to other amine oxidases, this enzyme contains haem, flavin mononucleotide, 2Fe-2S and tetrahydrofolic acid cofactors, and specifically catalyses the NADPH-dependent oxidation of dimethylamine. The structure of the a subunit reveals that it is a haem-binding PAS domain, similar in structure to PAS gas sensors(3). The dimethylamine substrate forms part of a highly polarized oxygen-binding site, and directly assists oxygen activation by acting as both an electron and proton donor. Our data reveal that the ubiquitous PAS domain can make the transition from sensor to enzyme, suggesting that the PAS scaffold can support the development of artificial enzymes.
机译:通用的Per-ARNT-Sim(PAS)域起信号转导模块的作用,涉及感知各种刺激,例如小分子,光,氧化还原态和气体(1,2)。高度进化的PAS支架可以结合各种配体,包括血红素,黄素和金属离子。然而,尽管这些配体可以支持催化活性,但是据我们所知,没有发现酶促PAS结构域。在这里,我们报告第一个PAS酶的表征:血红素依赖性氧化N-脱甲基酶。与其他胺氧化酶无关,该酶包含血红素,黄素单核苷酸,2Fe-2S和四氢叶酸辅因子,并特异性催化NADPH依赖性的二甲胺氧化。一个亚基的结构表明它是一个与血红素结合的PAS结构域,其结构类似于PAS气体传感器(3)。二甲胺底物形成高度极化的氧结合位点的一部分,并通过同时充当电子和质子供体来直接帮助氧活化。我们的数据表明,无处不在的PAS结构域可以实现从传感器到酶的转变,这表明PAS支架可以支持人造酶的发展。

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  • 来源
    《Nature》 |2016年第7630期|593-597|共5页
  • 作者单位

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England|Univ Orleans, CNRS, ICOA, UMR 7311, F-45067 Orleans, France;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England|German Fed Inst Risk Assessment BfR, Dept Chem & Product Safety, Max Dohrn Str 8-10, D-10589 Berlin, Germany;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

    Univ Manchester, Manchester Inst Biotechnol, Sch Chem, 131 Princess St, Manchester M1 7DN, Lancs, England;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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