are central to biotechnological and biomedical chemical processes for their own sake and as substructures of biologically active molecules for diverse biomedical applications. Structurally, these compounds contain a quaternary stereocenter, which is particularly challenging for stereoselective synthesis. The pyridoxal‐5′‐phosphate (PLP)‐dependent L‐serine hydroxymethyltransferase from Streptococcus thermophilus
Scalable and Selective β‐Hydroxy‐α‐Amino Acid Synthesis Catalyzed by Promiscuous
<scp>l</scp>
‐Threonine Transaldolase ObiH
作者:Tyler J. Doyon、Prasanth Kumar、Sierra Thein、Maeve Kim、Abigail Stitgen、Abbigail M. Grieger、Cormac Madigan、Patrick H. Willoughby、Andrew R. Buller
DOI:10.1002/cbic.202100577
日期:2022.1.19
catalyzes the diastereoselective synthesis of β-hydroxy-α-amino acids. We have demonstrated the synthetic utility of this enzyme through preparativescale reactions to selectively generate a structurally diverse array of β-hydroxy-α-amino acids, as well as downstream functionalization to generate important organic building blocks, such as β-chloro-α-amino acids and α-keto acids.
Corrigendum: Scalable and Selective β‐Hydroxy‐α‐Amino Acid Synthesis Catalyzed by Promiscuous
<scp>l</scp>
‐Threonine Transaldolase ObiH
作者:Tyler J. Doyon、Prasanth Kumar、Sierra Thein、Maeve Kim、Abigail Stitgen、Abbigail M. Grieger、Cormac Madigan、Patrick H. Willoughby、Andrew R. Buller
DOI:10.1002/cbic.202200156
日期:2022.4.20
as a carboxylate, and not a carboxylic acid. A corrected Figure 2 is provided. Figure 2 Open in figure viewerPowerPoint Analytical and preparative-scale synthesis of β-hydroxy-α-amino acids by ObiH. Reactions were performed using 20 mM aldehyde, 100 mM l-Thr, 50 mM Tris pH 8.5 and 1–2% ObiH wet whole cells, with 4 % (v/v) MeOH as co-solvent. Preparative scale reactions were incubated at 37 °C for 18 h
化合物22被错误地绘制为衍生自 1-萘醛的异构体,而实际上它是衍生自 2-萘醛。化合物15也应绘制为羧酸盐,而不是羧酸。提供了修正后的图 2。 图 2 在图形查看器中打开微软幻灯片软件 通过 ObiH 进行 β-羟基-α-氨基酸的分析和制备规模合成。使用 20 mM 醛、100 mM l- Thr、50 mM Tris pH 8.5 和 1-2% ObiH 湿全细胞进行反应,4% (v/v) MeOH 作为共溶剂。制备规模反应在 37°C 下孵育 18 小时,然后用 1 体积当量的 MeCN 淬灭,然后冻融和离心以去除细胞碎片。使用Biotage纯化系统通过反相色谱进行纯化。产量报告为冻干后分离的产物质量。1 H NMR水合分析用于校正过量水的产率值。在用 Marfey 试剂衍生后,通过 UPLC-PDA-MS 测定的分析规模产品产率。 第 4 页第 2 段也对相应文本进行了更正: “相反,为了进一步探索
[EN] ENGINEERED POLYPEPTIDES AND THEIR APPLICATIONS IN SYNTHESIS OF BETA-HYDROXY-ALPHA-AMINO ACIDS<br/>[FR] POLYPEPTIDES MODIFIÉS ET LEURS APPLICATIONS DANS LA SYNTHÈSE D'ACIDES BÊTA-HYDROXY-ALPHA-AMINÉS
申请人:ENZYMASTER NINGBO BIO ENG CO LTD
公开号:WO2018219107A1
公开(公告)日:2018-12-06
Provided are engineered polypeptides that are useful for the asymmetric synthesis of β-hydroxy-α-amino acids under industrial-relevant conditions. The engineered polypeptides disclosed are developed through directed evolution based on the ability of catalytic synthesis of (2S, 3R) -2-amino-3-hydroxy-3- (4-nitrophenyl) propanoic acid. Also provided are polynucleotides encoding the engineered polypeptides, host cells capable of expressing engineered polypeptides, and methods of producing β-hydroxy-α-amino acids using engineered polypeptides. Compared to other processes of preparation, the use of the engineered polypeptides for the preparation of β-hydroxy-α-amino acids results in high purity of the desired stereoisomers, mild reaction conditions, low pollution and low energy consumption. It has good industrial application prospects.
Improving and Inverting C<sub>β</sub>-Stereoselectivity of Threonine Aldolase via Substrate-Binding-Guided Mutagenesis and a Stepwise Visual Screening
作者:Qijia Chen、Xi Chen、Jinhui Feng、Qiaqing Wu、Dunming Zhu、Yanhe Ma
DOI:10.1021/acscatal.9b00859
日期:2019.5.3
Threoninealdolase (TA)-catalyzed aldol condensation is a powerful tool for C–C bond formation under mild conditions, but the low Cβ-stereoselectivity has hampered its wide application. A stepwise visual screening method was developed to measure the activity and stereoselectivity of threonine aldolase-catalyzed aldol condensation by employing a stereoselective phenylserine dehydratase, enabling direct