Determination of the Stereochemistry of Hydride Transfer from NADPH to FAD Catalyzed by VlmR, a Flavin Reductase from the Valanimycin Biosynthetic Pathway
摘要:
The stereospecificity of hydride transfer from NADPH to FAD catalyzed by VImR, a flavin reductase from the valanimycin biosynthetic pathway has been determined. By using stereospecifically deuterated NADPH, it has been shown that the 4-pro R hydrogen of NADPH is transferred.
Substrate selectivity of an isolated enoyl reductase catalytic domain from an iterative highly reducing fungal polyketide synthase reveals key components of programming
作者:Douglas M. Roberts、Christoph Bartel、Alan Scott、David Ivison、Thomas J. Simpson、Russell J. Cox
DOI:10.1039/c6sc03496a
日期:——
A cis-acting enoyl reductase (ER) catalytic domain was isolated from a fungal highly reducing iterative polyketidesynthase (HR-iPKS) for the first time and studied in vitro. The ER from the squalestatin tetraketide synthase forms a discrete dimeric protein in solution. The ER shows broad substrate selectivity, reducing enoyl species including both natural and unnatural substrates. Pantetheine-bound
首次从真菌高还原性重复聚酮合酶(HR-iPKS)中分离出顺式烯酰还原酶(ER)催化结构域并进行体外研究。来自角鲨他汀四酮化合物合酶的 ER 在溶液中形成离散的二聚体蛋白质。ER 显示出广泛的底物选择性,可减少烯酰基物质,包括天然和非天然底物。泛硫氨酸结合底物硫醇酯的反应速度比相应的 SNAC 硫醇酯快得多。非天然底物包括Z-烯烃、2-乙基烯烃和五肽。底物的甲基化改变了 ER 的活性,使得 2,4-二甲基辛-2-烯酰基底物适合活性位点但不能被还原。开发了一种新的基于 NMR 的测定法,用于直接观察 NADPH 辅因子 4' 位置以及底物 C-2 和 C-3 位置的立体化学偏好。该测定表明,真菌 iPKS ER 催化的反应在立体化学上与脊椎动物 FAS (vFAS) 在辅因子 4' 位和底物 3 位的反应相同,但完整 SQTKS 所表现出的高立体选择性消失,导致在2 位对分离的 ER 没有选择性。ER
Viviani, Fabrice; Gaudry, Michel; Marquet, Andree, Journal of the Chemical Society. Perkin transactions I, 1990, # 5, p. 1255 - 1259
Charlton, Peter A.; Young, Douglas W.; Birdsall, Berry, Journal of the Chemical Society. Perkin transactions I, 1985, p. 1349 - 1354
作者:Charlton, Peter A.、Young, Douglas W.、Birdsall, Berry、Feeney, James、Roberts, Gordon C. K.
DOI:——
日期:——
Padhi, Santosh Kumar; Bougioukou, Despina J.; Stewart, Jon D., Journal of the American Chemical Society, 2009, vol. 131, p. 3271 - 3280
作者:Padhi, Santosh Kumar、Bougioukou, Despina J.、Stewart, Jon D.
DOI:——
日期:——
Determination of the Stereochemistry of Hydride Transfer from NADPH to FAD Catalyzed by VlmR, a Flavin Reductase from the Valanimycin Biosynthetic Pathway
作者:Phillip Skae、Ronald J. Parry
DOI:10.1021/ol000389v
日期:2001.4.1
The stereospecificity of hydride transfer from NADPH to FAD catalyzed by VImR, a flavin reductase from the valanimycin biosynthetic pathway has been determined. By using stereospecifically deuterated NADPH, it has been shown that the 4-pro R hydrogen of NADPH is transferred.