Stereospecific Biosynthesis of β-Methyltryptophan from<scp>L</scp>-Tryptophan Features a Stereochemical Switch
作者:Yi Zou、Qi Fang、Haixing Yin、Zutao Liang、Dekun Kong、Linquan Bai、Zixin Deng、Shuangjun Lin
DOI:10.1002/anie.201306255
日期:2013.12.2
Make the switch: The three‐enzyme cassette MarG/H/I is responsible for stereospecificbiosynthesis of β‐methyltryptophan from L‐tryptophan (1). MarG/I convert 1 into (2S,3R)‐β‐methyltryptophan, while MarG/I combined with MarH convert 1 into (2S,3S)‐β‐methyltryptophan. MarH serves as a stereochemicalswitch by catalyzing the stereoinversion of the β‐stereocenter.
进行切换:三酶盒MarG / H / I负责L色氨酸的立体定向生物合成β-甲基色氨酸(1)。MarG / I将1转换为(2S,3R)-β-甲基色氨酸,而MarG / I与MarH结合将1转换为(2S,3S)-β-甲基色氨酸。MarH通过催化β-立体中心的立体反转而充当立体化学开关。
StnK2 catalysing a Pictet–Spengler reaction involved in the biosynthesis of the antitumor reagent streptonigrin
作者:Xiaozheng Wang、Dekun Kong、Tingting Huang、Zixin Deng、Shuangjun Lin
DOI:10.1039/c8ob02710b
日期:——
broad and potent antitumor activity. Previous isotope-labelling and genetic studies suggested that a β-carboline alkaloid should be a key intermediate of STN biosynthesis and formed via a Pictet–Spengler (PS) reaction. Herein, StnK2 was biochemically characterized to be a Pictet–Spenglerase (PSase) catalysing the formation of a tetrahydro-β-carboline (TH-βC) scaffold from (2S,3S)-β-methyl tryptophan and
Synthesis of β-Branched Tryptophan Analogues Using an Engineered Subunit of Tryptophan Synthase
作者:Michael Herger、Paul van Roye、David K. Romney、Sabine Brinkmann-Chen、Andrew R. Buller、Frances H. Arnold
DOI:10.1021/jacs.6b04836
日期:2016.7.13
We report that l-threonine may substitute for l-serine in the β-substitution reaction of an engineered subunit of tryptophan synthase from Pyrococcus furiosus, yielding (2S,3S)-β-methyltryptophan (β-MeTrp) in a single step. The trace activity of the wild-type β-subunit on this substrate was enhanced more than 1000-fold by directed evolution. Structural and spectroscopic data indicate that this increase
Streptonigrin biosynthesis. 4. Details of the tryptophan metabolism
作者:Steven J. Gould、Chiu Chin Chang、Dennis S. Darling、John D. Roberts、Michael Squillacote
DOI:10.1021/ja00525a040
日期:1980.2
the metabolism of tryptophan leading to the biosynthesis of streptonigrin have been elucidated. These include identification of L-tryptophan as the natural precursor, the isolation of an early intermediate in the pathway, and the use of ^(15)N-^(13)C heteronuclear spin couplings to eludicate the N-C bond cleavage leading to the 4-phenylpicolinicacidportion (C-D rings). Additional feedings have apparently
An Engineered Tryptophan Synthase Opens New Enzymatic Pathways to β-Methyltryptophan and Derivatives
作者:Daniel Francis、Michael Winn、Jonathan Latham、Michael F. Greaney、Jason Micklefield
DOI:10.1002/cbic.201600471
日期:2017.2.16
synthase (StTrpS) catalyses the condensation of 2‐, 4‐, 6‐ and 7‐substituted indoles with threonine to give (2S,3S)‐β‐methyltryptophans (β‐mTrp), which are important building blocks in drug synthesis. Addition of l‐amino acid oxidase (LAAO) gives (2R,3S)‐β‐mTrp. Halogenase (Hal) enzymes also provide halogenated β‐mTrp derivatives that can be arylated in a one‐pot chemo‐biotransformation.