A Flavin-Dependent Decarboxylase-Dehydrogenase-Monooxygenase Assembles the Warhead of α,β-Epoxyketone Proteasome Inhibitors.

A Flavin-Dependent Decarboxylase-Dehydrogenase-Monooxygenase Assembles the Warhead of α,β-Epoxyketone Proteasome Inhibitors.
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黄素依赖性脱羧酶-脱氢酶-单加氧酶组装 α,β-环氧酮蛋白酶体抑制剂的弹头。

DOI:
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发表时间:
2016
影响因子:
15
通讯作者:
G. Challis
G. Challis
中科院分区:
化学1区
文献类型:
--
作者:
Daniel Zabala;Joshua W. Cartwright;Douglas M. Roberts;Brian J. C. Law;Lijiang Song;Markiyan Samborskyy;P. Leadlay;Jason Micklefield;G. Challis

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α,β-环氧酮蛋白酶体抑制剂TMC-86 A是色褐链霉菌ATCC 49982的一种代谢产物,通过基因组测序确定了其生物合成的基因簇。[(13)C-甲基] L-甲硫氨酸的掺入实验表明TMC-86 A的生物合成中存在α-二甲基-β-酮酸中间体。化学合成的α-二甲基-β-酮酸与纯化的重组黄素依赖性酶(在所有已知的环氧酮生物合成途径中是保守的)一起孵育,导致形成相应的α-甲基-α,β-环氧酮。这种转变似乎是通过一个前所未有的脱羧-脱氢-单加氧级联进行的。TMC-86 A弹头的生物合成通过细胞色素P450介导的α-甲基-α,β-环氧酮的羟基化完成。
The α,β-epoxyketone proteasome inhibitor TMC-86A was discovered as a previously unreported metabolite of Streptomyces chromofuscus ATCC49982, and the gene cluster responsible for its biosynthesis was identified via genome sequencing. Incorporation experiments with [(13)C-methyl]l-methionine implicated an α-dimethyl-β-keto acid intermediate in the biosynthesis of TMC-86A. Incubation of the chemically synthesized α-dimethyl-β-keto acid with a purified recombinant flavin-dependent enzyme that is conserved in all known pathways for epoxyketone biosynthesis resulted in formation of the corresponding α-methyl-α,β-epoxyketone. This transformation appears to proceed via an unprecedented decarboxylation-dehydrogenation-monooxygenation cascade. The biosynthesis of the TMC-86A warhead is completed by cytochrome P450-mediated hydroxylation of the α-methyl-α,β-epoxyketone.
聚酮化合物脱羧链终止之前是素硫蛋白A生物合成中的O-磺化。
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