Complete characterization of the seventeen step moenomycin biosynthetic pathway.

Complete characterization of the seventeen step moenomycin biosynthetic pathway.
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DOI:
10.1021/bi901018q
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发表时间:
2009-09-22
期刊:
影响因子:
2.9
通讯作者:
Walker S
Walker S
中科院分区:
生物学3区
文献类型:
--
作者:
Ostash B;Doud EH;Lin C;Ostash I;Perlstein DL;Fuse S;Wolpert M;Kahne D;Walker S

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莫诺霉素是由甘纳链霉菌及相关生物产生的磷脂类抗生素。磷脂是已知的唯一的肽聚糖糖基转移酶的活性部位抑制剂,这是参与细菌细胞壁生物合成的一个重要的酶家族。尽管这些天然产物具有极强的抗生素活性,但由于药代动力学的限制,它们无法在临床上使用。我们先前鉴定了莫诺霉素生物合成基因簇,以促进新衍生物的生物合成途径。在这里,我们报道了一套全面的遗传和酶实验,这些实验建立了参与合成莫诺霉素及其变异体的17个莫诺霉素生物合成基因的功能。这些研究揭示了完整分子支架的组装顺序,并定义了参与合成生物活性类似物的七个基因的子集。这项工作将使磷脂支架在体外和基于发酵的重建成为可能,从而可以探索化学酶方法来获得新的类似物。
The moenomycins are phosphoglycolipid antibiotics produced by Streptomyces ghanaensis and related organisms. The phosphoglycolipids are the only known active site inhibitors of the peptidoglycan glycosyltransferases, an important family of enzymes involved in the biosynthesis of the bacterial cell wall. Although these natural products have exceptionally potent antibiotic activity, pharmacokinetic limitations have precluded their clinical use. We previously identified the moenomycin biosynthetic gene cluster in order to facilitate biosynthetic approaches to new derivatives. Here we report a comprehensive set of genetic and enzymatic experiments that establish functions for the seventeen moenomycin biosynthetic genes involved in the synthesis moenomycin and variants. These studies reveal the order of assembly of the full molecular scaffold and define a subset of seven genes involved in the synthesis of bioactive analogs. This work will enable both in vitro and fermentation-based reconstitution of phosphoglycolipid scaffolds so that chemoenzymatic approaches to novel analogs can be explored.
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