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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Exploring the redox reactions between heme and tetrahydrobiopterin in the nitric oxide synthases
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Exploring the redox reactions between heme and tetrahydrobiopterin in the nitric oxide synthases

机译:探索一氧化氮合酶中血红素与四氢生物蝶呤之间的氧化还原反应

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摘要

The NO synthases (NOSs) catalyze a two-step oxidation of L-arginine (Arg) to generate nitric oxide (NO) plus L-citrulline.Because NOSs are the only hemeproteins known to contain tetrahydrobiopterin (H_4B) as a bound cofactor,the function and role of H_4B in their heme-based oxygen activation and catalysis is of current interest.Distinct oxidative and reductive transitions of bound H_4B cofactor occur during catalysis and are associated with distinct redox transitions of the NOS heme and flavin prosthetic groups.In this perspective,we discuss the redox transitions of H_4B and heme with regard to their kinetics,regulation,role in the catalytic mechanism,and how and why they may be linked.
机译:NO合酶(NOSs)催化L-精氨酸(Arg)的两步氧化反应生成一氧化氮(NO)和L-瓜氨酸。因为NOSs是已知唯一包含四氢生物蝶呤(H_4B)作为结合辅因子的血红蛋白, H_4B在其基于血红素的氧活化和催化中的功能和作用是当前关注的问题。结合的H_4B辅因子的明显氧化和还原转变在催化过程中发生,并且与NOS血红素和黄素假体基团的明显氧化还原转变有关。 ,我们讨论了H_4B和血红素的氧化还原转变过程,涉及它们的动力学,调节作用,催化机理中的作用,以及它们如何以及为什么连接。

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