The glycosylation of natural product scaffolds with highly modified deoxysugars is often essential for their biological activity, being responsible for specific contacts to molecular targets and significantly affecting their pharmacokinetic properties. In order to provide tools for the targeted alteration of natural product glycosylation patterns, significant strides have been made to understand the biosynthesis of activated deoxysugars and their transfer. We report here efforts towards the production of plasmid-borne biosynthetic gene cassettes capable of producing TDP-activated forms of D-mycaminose, D-angolosamine and D-desosamine. We additionally describe the transfer of these deoxysugars to macrolide aglycones using the glycosyl transferases EryCIII, TylMII and AngMII, which display usefully broad substrate tolerance.
天然产物框架的糖基化,尤其是高度修饰的脱氧糖,通常对其
生物活性至关重要,负责与分子靶点的特定接触,并显著影响其药代动力学特性。为了提供针对
天然产物糖基化模式的目标性改变的工具,已经在理解活化脱氧糖的
生物合成及其转移方面取得了重要进展。我们在这里报告了制作
质粒载体生物合成
基因盒的努力,这些盒子能够生产TDP-活化形式的D-美卡
硫糖、D-安哥洛糖和D-脱
硫糖。同时,我们还描述了利用糖基转移酶EryCIII、TylMII和AngMII将这些脱氧糖转移到大环甾烯的工作,这些转移酶显示出有用的广谱底物耐受性。