Precursor-Directed polyketide biosynthesis in Escherichia coli
摘要:
Precursor-directed polyketide biosynthesis was demonstrated in the heterologous host Escherichia coli. Several diketide and triketide substrates were fed to a recombinant E. coli strain containing a variant form of deoxyerythronolide B synthase (DEBS) from which the first elongation module was deleted resulting in successful macrolactone formation from the diketide, but not the triketide, substrates. (C) 2003 Elsevier Ltd. All rights reserved.
Precursor Directed Biosynthesis of an Orthogonally Functional Erythromycin Analogue: Selectivity in the Ribosome Macrolide Binding Pocket
作者:Colin J. B. Harvey、Joseph D. Puglisi、Vijay S. Pande、David E. Cane、Chaitan Khosla
DOI:10.1021/ja304682q
日期:2012.7.25
antibiotic activity on the size and degree of unsaturation of the precursor. Based on these leads, we also report the precursor-directed biosynthesis of 15-propargyl erythromycin A, a novel antibiotic that not only is as potent as erythromycin A with respect to its ability to inhibit bacterial growth and cell-free ribosomal protein biosynthesis but also harbors an orthogonal functional group that is capable
大环内酯类抗生素红霉素 A 及其半合成类似物已成为治疗传染病最有用的抗菌剂之一。使用最近开发的用于 6-脱氧红霉素 D 类似物的前体导向生物合成和菌落生物测定的化学遗传策略,我们确定了一类新的炔基和烯基取代的大环内酯类,其活性与天然产物的活性相当。进一步的分析揭示了抗生素活性对前体的大小和不饱和度的显着和出乎意料的依赖性。基于这些线索,我们还报告了 15-炔丙基红霉素 A 的前体导向生物合成,
Employing Modular Polyketide Synthase Ketoreductases as Biocatalysts in the Preparative Chemoenzymatic Syntheses of Diketide Chiral Building Blocks
作者:Shawn K. Piasecki、Clint A. Taylor、Joshua F. Detelich、June Liu、Jianting Zheng、Arkady Komsoukaniants、Dionicio R. Siegel、Adrian T. Keatinge-Clay
DOI:10.1016/j.chembiol.2011.07.021
日期:2011.10
Chiral buildingblocks are valuable intermediates in the syntheses of naturalproducts and pharmaceuticals. A scalable chemoenzymaticroute to chiral diketides has been developed that includes the general synthesis of α-substituted, β-ketoacyl N-acetylcysteamine thioesters followed by a biocatalytic cycle in which a glucose-fueled NADPH-regeneration system drives reductions catalyzed by isolated modular
Stereospecificity of Ketoreductase Domains of the 6-Deoxyerythronolide B Synthase
作者:Roselyne Castonguay、Weiguo He、Alice Y. Chen、Chaitan Khosla、David E. Cane
DOI:10.1021/ja0753290
日期:2007.11.1
6-DeoxyerythronolideBsynthase (DEBS) is a modular polyketide synthase (PKS) responsible for the biosynthesis of 6-dEB (1), the parent aglycone of the broad spectrum macrolide antibiotic erythromycin. Individual DEBS modules, which contain the catalytic domains necessary for each step of polyketide chain elongation and chemical modification, can be deconstructed into constituent domains. To better
The thioesterase domain from the pimaricin and erythromycin biosynthetic pathways can catalyze hydrolysis of simple thioester substrates
作者:Krishna K. Sharma、Christopher N. Boddy
DOI:10.1016/j.bmcl.2007.03.060
日期:2007.6
biosynthetic pathways catalyze hydrolysis of a number of simple N-acetylcysteamine thioester derivatives. This study demonstrates that thioesterases are not highly substrate selective in formation of the acyl-enzymeintermediate, in contrast to non-ribosomal peptide synthase thioesterase domains that show very high specificity for substrate loading. This observation has important implications for the
Mechanism and Stereochemistry of Polyketide Chain Elongation and Methyl Group Epimerization in Polyether Biosynthesis
作者:Xinqiang Xie、Ashish Garg、Chaitan Khosla、David E. Cane
DOI:10.1021/jacs.7b00278
日期:2017.3.1
The polyketide synthases responsible for the biosynthesis of the polyether antibiotics nanchangmycin (1) and salinomycin (4) harbor a number of redox-inactive ketoreductase (KR0) domains that are implicated in the generation of C2-epimerized (2S)-2-methyl-3-ketoacyl-ACP intermediates. Evidence that the natural substrate for the polyether KR0 domains is, as predicted, a (2R)-2-methyl-3-ketoacyl-ACP