To meet recent advancements in the covalent reporter labeling of proteins, we propose a flexible synthesis for reporter analogs. Here we demonstrate a one-pot chemo-enzymatic synthesis of reporter-labeled proteins that allows the covalent tethering of any amine-terminal fluorescent or affinity label to a carrier protein or fusion construct. This two-reaction sequence consists of activated panthothenate coupling, biosynthetic conversion to the coenzyme A (CoA) analog, and enzymatic carrier protein modification via phosphopantetheinyltransferase (PPTase). We also probe substrate specificity for CoAA, the first enzyme in the pathway. With this approach CoA analogs may be rapidly prepared, thus permitting the regiospecific attachment of reporter moieties from a variety of molecular species.
为了应对蛋白质共价报告标记领域的最新进展,我们提出了一种灵活的报告模拟物合成方法。在此,我们展示了一种一锅法
化学酶合成带有报告标记的蛋白质的技术,该技术能够在载体蛋白质或融合构建体上共价连接任何
氨基末端荧光或亲和标记。这一双反应序列包括活化的
泛酸结合、
生物合成转化为
辅酶A(CoA)模拟物,以及通过
磷酸泛酰
巯基乙胺转移酶(P
PTase)进行的载体蛋白质修饰。我们还探究了该途径中第一个酶Co
AA的底物特异性。通过这种方法,CoA模拟物可以迅速制备,从而允许各种分子种类的报告基团在特定位置进行连接。