biosynthesized from acyl-CoA precursors by polyketide synthases. One of the limitations to combinatorial biosynthesis of polyketides has been the lack of a toolkit that describes the means of delivering novel acyl-CoA precursors necessary for polyketide biosynthesis. Using five acid-CoA ligases obtained from various plants and microorganisms, we biosynthesized an initial library of 79 acyl-CoA thioesters by screening
Thioester-mediated biocatalytic amide bond synthesis with in situ thiol recycling
作者:Christian Schnepel、Laura Rodríguez Pérez、Yuqi Yu、Antonio Angelastro、Rachel S. Heath、Max Lubberink、Francesco Falcioni、Keith Mulholland、Martin A. Hayes、Nicholas J. Turner、Sabine L. Flitsch
DOI:10.1038/s41929-022-00889-x
日期:——
catalyses the conversion of a wide range of carboxylicacids to acyl-S-Coenzyme A and other thioesters in good yields. CARsr-A was used in situ as part of a recycling system to regenerate thioesters for acyl-S-Coenzyme A-dependent enzymes in one-pot reactions. This concept of thioester recycling is demonstrated with a range of acyltransferases that allow the formation of diverse amides and the non-native
羧酸活化为硫酯在生物学中起着重要作用。然而,生化研究和生物技术应用受到普遍缺乏硫酯的阻碍,尤其是那些基于辅酶 A (CoA-SH) 的硫酯。在这里,我们通过利用羧酸还原酶 (CAR sr ) 的混杂活性展示了一种通用的硫酯回收酶。CAR sr (CAR sr -A)的腺苷酸化结构域催化各种羧酸以良好的产率转化为酰基-S-辅酶 A 和其他硫酯。汽车_-A 原位用作回收系统的一部分,以在一锅反应中为酰基-S-辅酶 A 依赖性酶再生硫酯。这种硫酯循环的概念通过一系列酰基转移酶得到证明,这些酰基转移酶允许使用表观遗传作者赖氨酸乙酰转移酶 HATp300 形成不同的酰胺和组蛋白衍生肽中赖氨酸侧链的非天然酰化。总的来说,这些结果为硫酯形成向酰胺形成及以后的形成建立了一个通用平台。
Structural and Biochemical Characterization of the Salicylyl-acyltranferase SsfX3 from a Tetracycline Biosynthetic Pathway
作者:Lauren B. Pickens、Michael R. Sawaya、Huma Rasool、Inna Pashkov、Todd O. Yeates、Yi Tang
DOI:10.1074/jbc.m111.299859
日期:2011.12
acyltransferase that transfers salicylate to the C-4 hydroxyl of a tetracycline intermediate in the penultimate step during biosynthesis of the anticancer natural product SF2575. The C-4 salicylate takes the place of the more common C-4 dimethylamine functionality, making SsfX3 the first acyltransferase identified to act on a tetracycline substrate. The crystal structure of SsfX3 was determined at 2.5
SsfX3 是一种 GDSL 家族酰基转移酶,在抗癌天然产物 SF2575 生物合成过程中的倒数第二步中,将水杨酸转移至四环素中间体的 C-4 羟基。C-4 水杨酸酯取代了更常见的 C-4 二甲胺官能团,使 SsfX3 成为第一个被确定作用于四环素底物的酰基转移酶。SsfX3 的晶体结构在 2.5 A 下测定,揭示了两个不同的结构域,如下所示:类似于碳水化合物结合模块的 N 端 β 夹心结构域,以及包含非典型 α/β 水解酶的 C 端催化结构域GDSL 水解酶家族中发现的折叠。活性位点位于一个大的开放结合袋的一端,该结合袋在空间上由 N 端和 C 端结构域的结构元件定义。假定的底物结合口袋中的突变分析鉴定了来自两个结构域的残基,这些残基对于结合酰基供体和受体很重要。此外,去除 N 端碳水化合物结合模块样结构域使独立的 α/β-水解酶结构域失活。因此,建议需要额外的非催化模块来限定结合袋并提