Polyketide decarboxylative chain termination preceded by o-sulfonation in curacin a biosynthesis.

Polyketide decarboxylative chain termination preceded by o-sulfonation in curacin a biosynthesis.
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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。

DOI:
10.1021/ja9071578
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发表时间:
2009-11-11
影响因子:
15
通讯作者:
Sherman, David H.
Sherman, David H.
中科院分区:
化学1区
文献类型:
--
作者:
Gu, Liangcai;Wang, Bo;Kulkarni, Amol;Gehret, Jennifer J.;Lloyd, Kayla R.;Gerwick, Lena;Gerwick, William H.;Wipf, Peter;Hakansson, Kristina;Smith, Janet. L.;Sherman, David H.

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天然产物系统中的生物合成创新是由新基因和酶进入这些复杂途径的招募所驱动的。本文描述了从海洋蓝藻lyngya majuscula中分离的抗癌先导化合物curacin A的聚酮合成酶的史无前例的脱羧链终止机制。在CurM中嵌入了含有相邻硫转移酶(ST)和硫酯酶(TE)催化结构域的特殊链终止模块,并对其进行了生化表征。结果表明,TE能催化聚酮链延伸中间体的水解链释放。此外,在te介导的水解之前,发现st介导的(R)-β-羟基选择性磺化,引发连续的脱羧消除,并在最终代谢物中形成罕见的末端烯烃。
Biosynthetic innovation in natural product systems is driven by the recruitment of new genes and enzymes into these complex pathways. Here, an unprecedented decarboxylative chain termination mechanism is described for the polyketide synthase of curacin A, an anticancer lead compound isolated from the marine cyanobacterium Lyngbya majuscula. The unusual chain termination module containing adjacent sulfotransferase (ST) and thioesterase (TE) catalytic domains embedded in CurM was biochemically characterized. The TE was proved to catalyze a hydrolytic chain release of the polyketide chain elongation intermediate. Moreover, a selective ST-mediated sulfonation of the (R)-β-hydroxyl group was found to precede TE-mediated hydrolysis, triggering a successive decarboxylative elimination and resulting in the formation of a rare terminal olefin in the final metabolite.
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发表时间: 2001-11-06
影响因子: 11.1
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