Formal Total Synthesis of the Polyketide Macrolactone Narbonolide
作者:Lakshmanan Venkatraman、Courtney C. Aldrich、David H. Sherman、Robert A. Fecik
DOI:10.1021/jo050924a
日期:2005.9.1
An improved synthesis of (3S)-3-dihydronarbonolide is reported that constitutes a formal total synthesis of the 14-membered macrolactone antibiotic narbonolide. The key step was an intramolecular Nozaki−Hiyama−Kishi coupling to accomplish macrocyclization in improved yield. The high level of convergence will also allow us to rapidly synthesize narbonolide analogues for the study of enzymes in the pikromycin
Synthesis and Biochemical Analysis of Complex Chain-Elongation Intermediates for Interrogation of Molecular Specificity in the Erythromycin and Pikromycin Polyketide Synthases
作者:Jonathan D. Mortison、Jeffrey D. Kittendorf、David H. Sherman
DOI:10.1021/ja9060596
日期:2009.11.4
The 6-deoxyerythronolide B synthase (DEBS) and pikromycin (Pik) polyketide synthase (PKS) are unique multifunctional enzyme systems that are responsible for the biosynthesis of the erythromycin and pikromycin 14-membered ring aglycones, respectively. Together, these natural product biosynthetic systems provide excellent platforms to examine the fundamental structural and catalytic elements that govern polyketide assembly, processing, and macrocyclization. In these studies, the native pentaketide intermediate for DEBS was synthesized and employed for in vitro chemoenzymatic synthesis of macrolactone products in engineered monomodules Ery5, Ery5-TE, and Ery6. A comparative analysis was performed with the corresponding Pik module 5 (PikAIII) and module 6 (PikAIV), dissecting key similarities and differences between these highly related PKSs. The data revealed that individual modules in the DEBS and Pik PKSs possess distinctive molecular selectivity profiles and suggest that substrate recognition has evolved unique characteristics in each system.
COMBINATORIAL POLYKETIDE LIBRARIES PRODUCED USING A MODULAR PKS GENE CLUSTER AS SCAFFOLD
申请人:Kosan Biosciences
公开号:EP0979286B1
公开(公告)日:2014-01-29
Macrolide synthesis: narbonolide
作者:Tatsuo Kaiho、Satoru Masamune、Tatsuo Toyoda
DOI:10.1021/jo00347a061
日期:1982.4
Probing Selectivity and Creating Structural Diversity Through Hybrid Polyketide Synthases
作者:Aaron A. Koch、Jennifer J. Schmidt、Andrew N. Lowell、Douglas A. Hansen、Katherine M. Coburn、Joseph A. Chemler、David H. Sherman
DOI:10.1002/ange.202004991
日期:2020.8.3
AbstractEngineering polyketidesynthases (PKS) to produce new metabolites requires an understanding of catalytic points of failure during substrate processing. Growing evidence indicates the thioesterase (TE) domain as a significant bottleneck within engineered PKS systems. We created a series of hybrid PKS modules bearing exchanged TE domains from heterologous pathways and challenged them with both
摘要工程化聚酮合酶 (PKS) 来产生新的代谢物需要了解底物处理过程中的催化失效点。越来越多的证据表明硫酯酶 (TE) 结构域是工程化 PKS 系统中的一个重要瓶颈。我们创建了一系列带有来自异源途径的交换 TE 结构域的混合 PKS 模块,并用天然和非天然聚酮化合物底物对它们进行挑战。野生型 PKS 模块与非天然底物配对的反应主要导致预期大环内酯的转化率较低。同样,带有非同源 TE 结构域的天然底物和混合 PKS 模块的产物形成也大大减少。相比之下,非天然底物被大多数含有底物兼容 TE 的混合模块转化,直接暗示该结构域作为主要的催化守门人,并强调其作为蛋白质工程目标的价值,以改善 PKS 途径中的模拟生产。