Discovery and Design of Family VIII Carboxylesterases as Highly Efficient Acyltransferases
作者:Henrik Müller、Simon P. Godehard、Gottfried J. Palm、Leona Berndt、Christoffel P. S. Badenhorst、Ann‐Kristin Becker、Michael Lammers、Uwe T. Bornscheuer
DOI:10.1002/anie.202014169
日期:2021.1.25
water, which enabled the synthesis of the drug moclobemide from methyl 4‐chlorobenzoate and 4‐(2‐aminoethyl)morpholine (ca. 20 % conversion). We solved the crystal structure of EstCE1 and detailed structure–function analysis revealed a three‐amino acid motif important for promiscuous acyltransferase activity. Introducing this motif into an esterase without acetyltransferase activity transformed a “hydrolase”
Ester Synthesis in Water: <i>Mycobacterium smegmatis</i>
Acyl Transferase for Kinetic Resolutions
作者:Nicolas de Leeuw、Guzman Torrelo、Carolin Bisterfeld、Verena Resch、Luuk Mestrom、Emanuele Straulino、Laura van der Weel、Ulf Hanefeld
DOI:10.1002/adsc.201701282
日期:2018.1.17
The acyl transferase from Mycobacterium smegmatis (MsAcT) catalyses transesterification reactions in aqueous media because of itshydrophobic active site. Aliphatic cyanohydrin and alkyne esters can be synthesised in water with excellent and strikingly opposite enantioselectivity [(R);E>37 and (S);E>100, respectively]. When using this enzyme, the undesired hydrolysis of the acyl donor is an important
Stereoselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-Allylic Silanes by Copper-Mediated Substitution Reactions of Allylic Carbamates with Grignard Reagents
作者:Jacqueline H. Smitrovich、K. A. Woerpel
DOI:10.1021/jo991312r
日期:2000.3.1
Both (Z)- and (E)-allylic silanes were prepared with high stereoselectivity by the copper-mediated substitution of allylic carbamates by organometallic reagents. The reaction of alkylmagnesium reagents with (E)-allylic carbamates provides (Z)-allylic silanes, whereas both alkylmagnesium and alkyllithium reagents react with (Z)-allylic carbamates to afford (E)-allylic silanes. Because Grignard reagents
Discovery and Redesign of a Family VIII Carboxylesterase with High (<i>S</i>)-Selectivity toward Chiral <i>sec</i>-Alcohols
作者:Areum Park、Seongsoon Park
DOI:10.1021/acscatal.1c05410
日期:2022.2.18
Furthermore, the (S)-selectivity of PBE has been significantly improved by rationalredesign based on molecular modeling. Molecular modeling identified a binding pocket composed of Ser381, Ala383, and Arg408 for the methyl substituent of (R)-1-phenylethyl acetate and suggested that larger residues may increase the enantioselectivity by interfering with the binding of the slow-reacting enantiomer. As predicted
高度对映选择性脂肪酶已广泛用于通过动力学或动态动力学拆分制备通用的对映纯手性仲醇。脂肪酶本质上是( R )-选择性的,很难获得( S )-选择性脂肪酶。VIII 族羧酸酯酶的最新晶体结构表明,其催化三联体的空间阵列是脂肪酶的镜像,但催化三联体不同于脂肪酶。因此,我们假设 VIII 族羧酸酯酶可能对类似于 ( S ) 的仲醇表现出( S )-对映选择性。)-选择性丝氨酸蛋白酶,其催化三联体也在空间上排列为它的镜像。在这项研究中,制备了一种已知家族 VIII 羧酸酯酶(pdb 代码:4IVK)的同源酶(来自变形杆菌SG_bin9 的羧酸酯酶,PBE),该酶不仅对3-丁炔等仲醇具有中等的 ( S )-选择性。-2-醇和1-苯乙醇以及( R )-对所探索的底物中特定仲醇的选择性。此外,(S)-PBE 的选择性已通过基于分子模型的合理重新设计显着提高。分子模型确定了一个由 Ser381、Ala383
Enhancing enantioselectivity of Candida antarctica lipase B towards chiral sec-alcohols bearing small substituents through hijacking sequence of A homolog
作者:Seonghyeon Yi、Seongsoon Park
DOI:10.1016/j.tetlet.2021.153186
日期:2021.7
Candidaantarctica lipase B (CAL-B) exhibits extraordinary enantioselectivitytowards most chiral sec-alcohols but not towards sec-alcohols bearing substituents smaller than a propyl group (i.e., (±)-but-3-yn-2-ol (E = 4) and (±)-butan-2-ol (E = 7)). Previously, we reported a homologous enzyme (lipase from Pseudozyma brasiliensis GHG001, PBL) of CAL-B, which exhibited high enantioselectivity of CAL-B
南极假丝酵母脂肪酶 B (CAL-B) 对大多数手性仲醇表现出非凡的对映选择性,但对带有小于丙基取代基的仲醇(即(±)-but-3-yn-2-ol ( E = 4) 和 (±)-butan-2-ol ( E = 7))。此前,我们报道了CAL-B 的一种同源酶(来自巴西假酵母 GHG001 的脂肪酶,PBL),其对 CAL-B 对 (±)-but-3-yn-2-ol ( E > 200)。基于该结果,我们假设它们的局部序列或结构的比较将为增强CAL-B的对映选择性提供线索。在本文中,我们报告了通过用 CAL-B 的局部序列替换 CAL-B 的局部序列来增强 CAL-B 对 (±)-but-3-yn-2-ol 和 (±)-butan-2-ol 的对映选择性PBL。CAL-B 的序列取代突变体对 (±)-but-3-yn-2-ol ( E > 200) 和 (±)-butan-2-ol (