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Enediyne Antitumor Antibiotic Maduropeptin Biosynthesis Featuring aC-Methyltransferase That Acts on a CoA-Tethered Aromatic Substrate
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2010-09-15 , DOI: 10.1021/ja1050814
Jianya Ling 1 , Geoffrey P Horsman , Sheng-Xiong Huang , Yinggang Luo , Shuangjun Lin , Ben Shen
Affiliation  

The enediyne antitumor antibiotic maduropeptin (MDP) is produced by Actinomadura madurae ATCC 39144. The biosynthetic pathway for the 3,6-dimethylsalicylic acid moiety of the MDP chromophore is proposed to be comprised of four enzymes: MdpB, MdpB1, MdpB2, and MdpB3. Based on the previously characterized biosynthesis of the naphthoic acid moiety of neocarzinostatin (NCS), we expected a biosynthetic pathway featuring carboxylic acid activation by the MdpB2 CoA ligase immediately before its coupling to an enediyne core intermediate. Surprisingly, the MDP aromatic acid biosynthetic pathway employs an unusual logic in which MdpB2-catalyzed CoA activation occurs before MdpB1-catalyzed C-methylation, demonstrating that MdpB1 is apparently unique in its ability to C-methylate a CoA-tethered aromatic acid. MdpB2 is a promiscuous CoA ligase capable of activating a variety of salicylic acid analogues, a property that could be potentially exploited to engineer MDP analogues.

中文翻译:

Enediyne 抗肿瘤抗生素 Maduropeptin 生物合成,具有 C-甲基转移酶,作用于 CoA-Tethered 芳香底物

烯二炔抗肿瘤抗生素 maduropeptin (MDP) 由 Actinomadura madurae ATCC 39144 生产。 MDP 生色团的 3,6-二甲基水杨酸部分的生物合成途径被提议由四种酶组成:MdpB、MdpB1、MdpB2 和 MdpB3。基于先前表征的新制癌素 (NCS) 萘甲酸部分的生物合成,我们预期了一种生物合成途径,其特征是 MdpB2 CoA 连接酶在与烯二炔核心中间体偶联之前立即激活羧酸。令人惊讶的是,MDP 芳香酸生物合成途径采用了一种不寻常的逻辑,其中 MdpB2 催化的 CoA 活化发生在 MdpB1 催化的 C-甲基化之前,这表明 MdpB1 显然具有独特的能力,即 C-甲基化与 CoA 相连的芳香酸。
更新日期:2010-09-15
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