The Catalytic Potential of<i>Coptis japonica</i>NCS2 Revealed - Development and Utilisation of a Fluorescamine-Based Assay
作者:Thomas Pesnot、Markus C. Gershater、John M. Ward、Helen C. Hailes
DOI:10.1002/adsc.201200641
日期:2012.11.12
The versatility and potential of a norcoclaurine synthase (NCS) from Coptis japonica NCS2 has been investigated, together with the development and application of a novel fluorescence-based high-throughput assay using nearly forty amines/aldehydes. The stereocontrol exerted by CjNCS2 on selected non-natural substrates has been determined, where the tetrahydroisoquinolines (THIAs) were formed as the
[EN] NOVEL ENANTIOMERS OF TETRAHYDROISOQUINOLINE DERIVATIVES AND THEIR PHARMACEUTICALLY ACCEPTABLE SALTS, THEIR PREPARATIONS AND PHARMACEUTICAL COMPOSITIONS<br/>[FR] NOUVEAUX ENANTIOMERES DE DERIVES DE TETRAHYDROISOQUINOLINE ET LEURS SELS PHARMACEUTIQUEMENT ACCEPTABLES, PREPARATIONS ET COMPOSITIONS PHARMACEUTIQUES DE CES DERNIERS
申请人:YUN-CHOI HYE-SOOK
公开号:WO2003095426A1
公开(公告)日:2003-11-20
The disclosure concerns novel enantiomers of tetrahydroisoquinoline derivatives and their pharmaceutically acceptable salts, their preparations and pharmaceutical compositions. The enantiomers of tetrahydroisoquinoline derivatives are provided which are useful in stimulating heart rate and hypotensive activity, inhibitory activity against platelet aggregation, and suppressive against inducible NO synthase. The enantiomers of tetrahydroisoquinoline derivatives and their pharmaceutically acceptable salts are effective for treating congestive heart failure, hypertension, thrombosis, inflammation, septicemia, cardiac insufficiency, and disseminated intravascular coagulopathy.
Design and Use of de novo Cascades for the Biosynthesis of New Benzylisoquinoline Alkaloids
作者:Yu Wang、Nadine Tappertzhofen、Daniel Méndez‐Sánchez、Maria Bawn、Boyu Lyu、John M. Ward、Helen C. Hailes
DOI:10.1002/anie.201902761
日期:2019.7.22
The benzylisoquinolinealkaloids (BIAs) are an important group of secondary metabolites from higher plants and have been reported to show significant biological activities. The production of BIAs through synthetic biology approaches provides a higher‐yielding strategy than traditional synthetic methods or isolation from plant material. However, the reconstruction of BIA pathways in microorganisms by
An efficient, stereoselective, green synthesis of (S)-norcoclaurine (higenamine) has been developed using the recombinant (S)-norcoclaurine synthase (NCS) enzyme, starting from the cheap tyrosine and dopamine substrates in a one-pot, two step process. Key steps in the biotransformation consist of the oxidative decarboxylation of tyrosine by stoichiometric amounts of sodium hypochlorite in order to generate 4-hydroxyphenylacetadehyde, followed by the addition of enzyme and dopamine substrate in the presence of ascorbate, a necessary ingredient in order to avoid oxidation of the catechol moiety. Quantitative extraction of the product from an aqueous solution was achieved by adsorption onto active charcoal dispersed in the reaction mixture. The optimized process afforded enantiomerically pure (S)-norcoclaurine (93%) in a yield higher than 80% and allowed good recovery of the enzyme for recycling. The process thus developed represents the first example of a green Pictet–Spengler synthesis, which may pave the way to novel strategies in benzylisoquinoline alkaloid synthesis.
(S)-norcoclaurine is the central intermediate in benzylisoquinoline alkaloid biosynthesis
作者:Richard Stadler、Toni M. Kutchan、Meinhart H. Zenk
DOI:10.1016/0031-9422(89)80187-6
日期:1989.1
Abstract Feeding experiments with ( S )-[1- 13 C]-norcoclaurine demonstrate that this trihydroxylated precursor is specifically incorporated into protoberberine, aporphine and benzophenanthridine alkaloids in cell suspension cultures, as well as into pavine and benzophenanthridine alkaloids in whole plants. The rates of incorporation ranged from 2.5 to 36%. This reveals that tyrosine is metabolized