Changing Face: A Key Residue for the Addition of Water by Sclareol Synthase.

Changing Face: A Key Residue for the Addition of Water by Sclareol Synthase.
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DOI:
10.1021/acscatal.8b00121
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发表时间:
2018-04-06
期刊:
影响因子:
12.9
通讯作者:
Peters RJ
Peters RJ
中科院分区:
化学1区
文献类型:
--
作者:
Jia M;O'Brien TE;Zhang Y;Siegel JB;Tantillo DJ;Peters RJ

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香紫苏醇合成酶(SsSS)天然作用于8 α-羟基-柯巴基二磷酸(1),立体选择性地加水生成(13 R)-香紫苏醇(2a),并与多种其他双环二萜前体类似地生成羟基化产物。在此,确定了添加水的关键残留物。引人注目的是,用谷氨酰胺取代将立体化学结果转换为1,导致选择性产生(13S)-香紫苏醇(2b)。此外,用结构上密切相关的底物柯巴基二磷酸(4)加水的立体特异性变化可以通过替代取代来实现。因此,这种方法预计将提供生物合成获得的13-羟基化的衍生物的差向异构体的多种劳丹相关的二萜。
Sclareol synthase from Salvia sclarea (SsSS) naturally acts on 8α-hydroxy-copalyl diphosphate (1), stereoselectively adding water to produce (13R)-sclareol (2a), and similarly yields hydroxylated products with manifold other such bicyclic diterpene precursors. Here a key residue for this addition of water was identified. Strikingly, substitution with glutamine switches stereochemical outcome with 1, leading to selective production of (13S)-sclareol (2b). Moreover, changes to the stereospecificity of water addition with the structurally closely-related substrate copalyl diphosphate (4) could be accomplished with alternative substitutions. Thus, this approach is expected to provide biosynthetic access to both epimers of 13-hydroxylated derivatives of manifold labdane-related diterpenes.
DOI: 10.1021/acs.orglett.8b00121
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影响因子: 5.2
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