Chemoenzymatic Synthesis of the Polyketide Macrolactone 10-Deoxymethynolide
作者:Courtney C. Aldrich、Lakshmanan Venkatraman、David H. Sherman、Robert A. Fecik
DOI:10.1021/ja0504340
日期:2005.6.1
the natural product 10-deoxymethynolide. A steady-state kinetic analysis of the hexaketidechain intermediate with Pik TE was done. A preliminary substrate specificity study with unnatural hexaketide analogues was accomplished, demonstrating the importance of total synthesis in obtaining access to advanced polyketide intermediates. The results show the sensitivity of Pik TE to minor substrate modifications
聚酮合酶衍生的皮克霉素硫酯酶 (Pik TE) 具有独特的催化 12 和 14 元大环内酯环化的能力。在这项研究中,天然六酮链延长中间体作为其 N-乙酰半胱胺 (NAC) 硫酯的全合成已经实现,其与 Pik TE 的反应证明了 Pik TE 催化其大环内酯化成天然产物 10-脱氧甲炔内酯。使用 Pik TE 对六酮链中间体进行稳态动力学分析。完成了对非天然六酮化合物类似物的初步底物特异性研究,证明了全合成在获得高级聚酮化合物中间体方面的重要性。结果表明 Pik TE 对微小的底物修饰敏感,
Biochemical Investigation of Pikromycin Biosynthesis Employing Native Penta- and Hexaketide Chain Elongation Intermediates
作者:Courtney C. Aldrich、Brian J. Beck、Robert A. Fecik、David H. Sherman
DOI:10.1021/ja042592h
日期:2005.6.1
the pikromycin (Pik) polyketidesynthase to generate 12- and 14-membered ring macrolactones presents an opportunity to explore the fundamental processes underlying polyketide synthesis, specifically the mechanistic details of chain extension, keto group processing, acyl chain release, and macrocyclization. We have synthesized the natural pentaketide and hexaketidechainelongation intermediates as N-acetyl
Linear Aglycones Are the Substrates for Glycosyltransferase DesVII in Methymycin Biosynthesis: Analysis and Implications
作者:Chai-Lin Kao、Svetlana A. Borisova、Hak Joong Kim、Hung-wen Liu
DOI:10.1021/ja058433v
日期:2006.5.1
The two essential structural components of macrolide antibiotics are the polyketide aglycone and the appended sugars. The aglycone formation is catalyzed by polyketide synthase (PKS), and glycosylation is catalyzed by an appropriate glycosyltransferase. Although it has been shown that glycosylation occurs after the cyclicaglycone is released from PKS, it is not known whether the acyl carrier protein