Microscale synthesis and kinetic isotope effect analysis of (4R)-[Ad-(14)C, 4-(2)H] NADPH and (4R)-[Ad-(3)H,4-(2)H] NADPH.

Microscale synthesis and kinetic isotope effect analysis of (4R)-[Ad-(14)C, 4-(2)H] NADPH and (4R)-[Ad-(3)H,4-(2)H] NADPH.
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DOI:
10.1002/jlcr.1660
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发表时间:
2009-09-15
影响因子:
1.8
通讯作者:
Kohen, Amnon
Kohen, Amnon
中科院分区:
医学4区
文献类型:
--
作者:
Yahashiri, Atsushi;Sen, Arundhuti;Kohen, Amnon

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我们提出了一种 NADPH 的一锅化学酶微尺度合成方法,具有两种不同同位素标记模式:(4R)-[Ad-14C,4-2H] NADPH 和 (4R)-[Ad-3H,4-2H] NADPH。这些辅因子是多种酶所必需的,因此同位素标记的烟酰胺引起了研究人员的极大兴趣。在当前程序中,[Ad-14C] NAD+ 和 [Ad-3H] NAD+ 被 NAD+ 激酶磷酸化,分别产生 [Ad-14C] NADP+ 和 [Ad-3H] NADP+。然后使用热厌氧布氏醇脱氢酶将氘从异丙醇的C2立体定向地转移至NADP+的C4的表面。经HPLC纯化后,NMR分析表明4R位氘含量大于99.7%。然后使用标记的辅因子成功、灵敏地测量 R67 二氢叶酸还原酶的动力学同位素效应,为该合成方法的实用性提供了有力的证据。
We present a one-pot chemo-enzymatic microscale synthesis of NADPH with two different patterns of isotopic labels: (4R)-[Ad-14C,4-2H] NADPH and (4R)-[Ad-3H,4-2H] NADPH. These co-factors are required by an enormous range of enzymes, and isotopically labeled nicotinamides are consequently of significant interest to researchers. In the current procedure, [Ad-14C] NAD+ and [Ad-3H] NAD+ were phosphorylated by NAD+ kinase to produce [Ad-14C] NADP+ and [Ad-3H] NADP+, respectively. Thermoanaerobium brockii alcohol dehydrogenase was then used to stereospecifically transfer deuterium from C2 of isopropanol to the re face of C4 of NADP+. After purification by HPLC, NMR analysis indicated the deuterium content at the 4R position is more than 99.7 %. The labeled cofactors were then used to successfully and sensitively measure kinetic isotope effects for R67 dihydrofolate reductase, providing strong evidence for the utility of this synthetic methodology.
DOI: 10.2174/157341106778520508
发表时间: 2006-10-01
影响因子: 1.8
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