Elucidation of oxygenation steps during oviedomycin biosynthesis and generation of derivatives with increased antitumor activity.

Elucidation of oxygenation steps during oviedomycin biosynthesis and generation of derivatives with increased antitumor activity.
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DOI:
10.1002/cbic.200800425
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发表时间:
2009-01-26
期刊:
影响因子:
3.2
通讯作者:
Mendez, Carmen
Mendez, Carmen
中科院分区:
生物学3区
文献类型:
--
作者:
Lombo, Felipe;Abdelfattah, Mohamed S.;Brana, Alfredo F.;Salas, Jose A.;Rohr, Juergen;Mendez, Carmen

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通过将三个加氧酶基因与来自链霉菌ATCC 11891的奥维霉素生物合成基因簇的聚酮合酶和环化酶基因组合在一起,在白色链霉菌中产生了八种不同的angucyclinone。其中四种化合物首次得到了充分表征。其中三种angucyclinones-prejadomycin-2-carboxylate(2),4a,12 b-双-UWM 6(5)和prejadomycin(3)-显示出相对于oviedomycin(1)的体外抗肿瘤活性显著增加。提出了一个假说的序列的剪裁事件催化的这三个加氧酶在奥维霉素的生物合成。在该假设中,OvmOII充当双功能加氧酶/脱氢酶。
Eight different angucyclinones have been produced in Streptomyces albus by combining three oxygenase genes together with the polyketide synthase and cyclases genes from the oviedomycin biosynthetic gene cluster from Streptomyces antibioticus ATCC 11891. Four of these compounds were fully characterized for the first time. Three of these angucyclinones—prejadomycin-2-carboxylate (2), 4a,12b-dehydro-UWM6 (5), and prejadomycin (3)—show a significant increase in their in vitro antitumor activity relative to oviedomycin (1). A hypothesis for the sequence of tailoring events catalyzed by these three oxygenases during oviedomycin biosynthesis is proposed. In this hypothesis OvmOII acts as a bifunctional oxygenase/dehydratase.
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