Complete Stereoinversion of l-Tryptophan by a Fungal Single-Module Nonribosomal Peptide Synthetase
摘要:
Single-module nonribosomal peptide synthetases (NRPSs) and NRPS-like enzymes activate and transform carboxylic acids in both primary and secondary metabolism and are of great interest due to their biocatalytic potentials. The single-module NRPS IvoA is essential for fungal pigment biosynthesis. Here, we show that IvoA catalyzes ATP-dependent unidirectional stereo inversion of L-tryptophan to D-tryptophan with complete conversion. While the stereoinversion is catalyzed by the epimerization (E) domain, the terminal condensation (C) domain stereoselectively hydrolyzes D-tryptophanyl-S-phosphopantetheine thioester and thus represents a noncanonical C domain function. Using IvoA, we demonstrate a biocatalytic stereoinversion/deracemization route to access a variety of substituted D-tryptophan analogs in high enantiomeric excess.
One-Pot Biocatalytic Synthesis of Substituted<scp>d</scp>-Tryptophans from Indoles Enabled by an Engineered Aminotransferase
作者:Fabio Parmeggiani、Arnau Rué Casamajo、Curtis J. W. Walton、James L. Galman、Nicholas J. Turner、Roberto A. Chica
DOI:10.1021/acscatal.9b00739
日期:2019.4.5
d-Tryptophan and its derivatives are important precursors of a wide range of indole-containing pharmaceuticals and naturalproducts. Here, we developed a one-pot biocatalytic process enabling the synthesis of d-tryptophans from indoles in good yields and high enantiomeric excess (91% to >99%). Our method couples the synthesis of l-tryptophans catalyzed by Salmonella enterica tryptophan synthase with
CYCLOHEXAPEPTIDES AS SELECTIVE SOMATOSTATIN SST5 RECEPTOR AGONISTS
申请人:Heptares Therapeutics Limited
公开号:US20210363188A1
公开(公告)日:2021-11-25
The disclosures herein relate to novel compounds of formula (1): (1) and salts thereof, wherein W, X, Y, Z, m, n, q, R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are defined herein, and their use in treating, preventing, ameliorating, controlling or reducing the risk of disorders associated with somatostatin receptors.
[EN] TRYPTOPHAN DERIVATIVES AS SWEETENERS<br/>[FR] DÉRIVÉS DE TRYPTOPHANE UTILISÉS COMME ÉDULCORANTS
申请人:CHROMOCELL CORP
公开号:WO2019113443A2
公开(公告)日:2019-06-13
The present disclosure provides compounds of Formula (I) and edible compositions comprising compounds of Formula (I) which are suitable for use as sweeteners, for example, by incorporation into edible compositions. Also provided herein are methods of preparing comestible compositions comprising compounds of Formula (I).