Characteristics of <scp>l</scp>-threonine transaldolase for asymmetric synthesis of β-hydroxy-α-amino acids
作者:Lian Xu、Li-Chao Wang、Xin-Qi Xu、Juan Lin
DOI:10.1039/c9cy01608b
日期:——
L-threo-β-hydroxy-α-amino acid so far reported by enzymatic synthesis. Finally, synthesis of L-threo-p-methylsulfonylphenylserine at a 100 mL scale by whole-cell biocatalysis was conducted. This is the first systematic report of L-threonine transaldolase as a robust biocatalyst for preparation of β-hydroxy-α-amino acids, which can provide new insights for β-hydroxy-α-amino acidssynthesis.
Threonine aldolases—an emerging tool for organic synthesis
作者:Johannes Steinreiber、Kateryna Fesko、Christoph Reisinger、Martin Schürmann、Friso van Assema、Michael Wolberg、Daniel Mink、Herfried Griengl
DOI:10.1016/j.tet.2006.11.035
日期:2007.1
In a systematic study, 21 ring-substituted benzaldehydes were reacted with glycine under catalysis with a L-threonine aldolase (LTA) from Pseudomonas putida and a D-threonine aldolase (DTA) from Alcaligenes xylosoxidans to form the corresponding beta-hydroxy-alpha-amino acids 1-18. DTA proved to be highly selective with ee's > 99% (D) and de's up to 99% (syn). Two thiamphenicol precursors were synthesized utilizing DTA on a preparative scale. LTA-catalyzed reactions led to ee's > 99% (L) but low to moderate de's (20-50%, syn). (c) 2006 Elsevier Ltd. All rights reserved.
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