Library of Norcoclaurine Synthases and Their Immobilization for Biocatalytic Transformations.
Library of Norcoclaurine Synthases and Their Immobilization for Biocatalytic Transformations.
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去甲乌云碱合成酶文库及其用于生物催化转化的固定化。
DOI:
10.1002/biot.201700542
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发表时间:
2018
影响因子:
4.7
通讯作者:
Lechner H
中科院分区:
文献类型:
--
作者:
Lechner H
Norcoclaurine synthases (NCS), catalyzing a Pictet–Spengler reaction in plants as one of the first enzymes in the biosynthetic benzylisoquinoline pathway, are investigated for biocatalytic transformations. The library of NCS available is extended by two novel NCSs fromArgemone mexicana(AmNCS1, AmNCS2) and one new NCS fromCorydalis saxicola(CsNCS); furthermore, it is shown that the NCS fromPapaver bracteatum(PbNCS) is a highly productive catalyst leading to the isoquinoline product with up to >99% e.e. Under certain conditions lyophilized wholeEscherichia colicells containing the various overexpressed NCS turned out to be suitable catalysts. The reaction using dopamine as substrate bears several challenges such as the spontaneous non‐stereoselective background reaction and side reactions. The PbNCS enzyme is successfully immobilized on various carriers whereby EziG3 proved to be the best suited for biotransformations. Dopamine showed limited stability in solution resulting in the coating of the catalyst over time, which could be solved by the addition of ascorbic acid (e.g., 1 mg ml−1) as antioxidant.
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