Light-driven biocatalytic reduction of α,β-unsaturated compounds by ene reductases employing transition metal complexes as photosensitizers
作者:Martyn K. Peers、Helen S. Toogood、Derren J. Heyes、David Mansell、Benjamin J. Coe、Nigel S. Scrutton
DOI:10.1039/c5cy01642h
日期:——
Efficient and cost effective nicotinamide cofactor regeneration is essential for industrial-scale bio-hydrogenations employing flavin-containing biocatalysts such as the Old Yellow Enzymes.
Biocatalysis with Thermostable Enzymes: Structure and Properties of a Thermophilic ‘ene’-Reductase related to Old Yellow Enzyme
作者:Björn V. Adalbjörnsson、Helen S. Toogood、Anna Fryszkowska、Christopher R. Pudney、Thomas A. Jowitt、David Leys、Nigel S. Scrutton
DOI:10.1002/cbic.200900570
日期:2010.1.25
A hot, new OldYellowEnzyme: We describe the X‐ray crystal structure of a new thermostableOldYellowEnzyme, and report its kinetic properties, thermo‐ and solvent stability, and biocatalytic potential. The markedly improved solvent stability of the enzyme shows great potential for applications in industrial‐scale biotransformations.
一种热的新旧黄色酶:我们描述了一种新的耐热旧黄色酶的 X 射线晶体结构,并报告了其动力学特性、热稳定性和溶剂稳定性以及生物催化潜力。该酶显着改善的溶剂稳定性显示出在工业规模生物转化中的巨大应用潜力。
Asymmetric Reduction of Activated Alkenes by Pentaerythritol Tetranitrate Reductase: Specificity and Control of Stereochemical Outcome by Reaction Optimisation
作者:Anna Fryszkowska、Helen Toogood、Michiyo Sakuma、Johnâ M. Gardiner、Gillâ M. Stephens、Nigelâ S. Scrutton
DOI:10.1002/adsc.200900574
日期:2009.11
We show that pentaerythritoltetranitratereductase (PETNR), a member of the ‘ene’ reductase old yellow enzyme family, catalyses the asymmetric reduction of a variety of industrially relevant activated α,β-unsaturated alkenes including enones, enals, maleimides and nitroalkenes. We have rationalised the broad substrate specificity and stereochemical outcome of these reductions by reference to molecular
我们显示季戊四醇四硝酸盐还原酶(PETNR),'烯'还原酶老黄色酶家族的成员,催化各种工业相关的活化α,β-不饱和烯烃包括烯酮,烯醛,马来酰亚胺和硝基烯烃的不对称还原。通过参考基于PETNR与2-环己烯酮4a的晶体复合物的酶-底物复合物的分子模型,我们合理化了这些还原反应的广泛的底物特异性和立体化学结果。产品的光学纯度是可变的(49–99%ee),具体取决于底物类型和取代基的性质。通常,对于立体定位中心在Cβ(> 99%ee的反应产物)观察到高对映体选择性)。不过,现有的在两种异构形式(例如,柠檬醛基板11A或硝基烯烃18 - 19A),减少的enantiodivergent当然E / Z -forms可能导致降低产品的enantiopurities。我们还证明,对于具有Cα立体定位中心的产品,其光学纯度差是由于非酶消旋作用。在与酮异佛尔酮3a的反应中,我们表明通过优化反应,特别是通过缩短
Stereodivergent Synthesis of Carveol and Dihydrocarveol through Ketoreductases/Ene‐Reductases Catalyzed Asymmetric Reduction
building blocks in the synthesis of natural products. Despite the remarkable progress in asymmetriccatalysis, convenient access to all possible stereoisomers of carveol and dihydrocarveol remains a challenge. Here, we present the stereodivergent synthesis of carveol and dihydrocarveol through ketoreductases/ene‐reductases catalyzed asymmetric reduction. By directly asymmetric reduction of (R)‐ and
A robust and stereocomplementary panel of ene-reductase variants for gram-scale asymmetric hydrogenation
作者:Nathalie Nett、Sabine Duewel、Luca Schmermund、Gerrit E. Benary、Kara Ranaghan、Adrian Mulholland、Diederik J. Opperman、Sabrina Hoebenreich
DOI:10.1016/j.mcat.2021.111404
日期:2021.2
engineered panel of ene-reductases (ERs) from Thermus scotoductus SA-01 (TsER) that combines control over facial selectivity in the reduction of electron deficient CC doublebonds with thermostability (up to 70 °C), organic solvent tolerance (up to 40 % v/v) and a broad substrate scope (23 compounds, three new to literature). Substrate acceptance and facial selectivity of 3-methylcyclohexenone was rationalized
我们报告了由Thermus scotoductus SA-01(Ts ER)制成的烯化还原酶(ERs)工程组合,该组合将对面部选择性的控制与热稳定性(最高70°C),有机溶剂,减少电子缺陷性C C双键的还原相结合耐受性(最高40%v / v)和广泛的底物范围(23种化合物,三种是文献中的新化合物)。通过Ts ER C25D / I67T的结晶和计算机对接,可以使3-甲基环己烯酮的底物接受度和面部选择性合理化。的TS ER变体面板显示出优异的对映体过量(EE)和产率在双相制备规模合成,具有高达93%的分离产率2 - [R,5S-二氢香芹酮(3.6g)。达到约40 000 h -1的周转频率(TOF),可与杂金属和均相金属催化的加氢速率相比。初步分批反应还证明了反应体系的可重复使用性,方法是依次除去有机相(正戊烷)以除去产物并用新鲜的底物代替。四个连续的批次产生约。来自45 mL水性反应的27