Expanding the utility of proteases in synthesis: broadening the substrate acceptance in non-coded amide bond formation using chemically modified mutants of subtilisin
作者:Kanjai Khumtaveeporn、Astrid Ullmann、Kazutsugu Matsumoto、Benjamin G. Davis、J.Bryan Jones
DOI:10.1016/s0957-4166(01)00024-6
日期:2001.2
strategy of combined site directed mutagenesis and chemical modification creates chemically modified mutants (CMMs) with greatly broadened substrate specificities. We have previously reported that the CMMs of subtilisin Bacillus lentus (SBL) are efficient catalysts for the coupling of both l- and d-amino acids. We now report that these powerful catalysts also allow amide bond formation between a variety
定点诱变和化学修饰相结合的策略产生了具有大大拓宽的底物特异性的化学修饰的突变体(CMM)。我们以前曾报道过枯草杆菌蛋白酶芽孢杆菌的三坐标测量机(SBL)是用于L-和D-氨基酸偶联的有效催化剂。我们现在报道,这些功能强大的催化剂还允许在各种非编码羧酸之间形成酰胺键,包括β-丙氨酸和苯丙氨酸的β-氨基同系物,以及l-和d-氨基酸亲核试剂。作为酶效率的指导,已采用指示pH变化的水解测定法。与野生型酶(WT)相比,通过该筛选选择的CMM可提供更高的偶联产物收率。此外,WT和CMM酶均允许用氨基酸胺对内消旋二酯进行高度立体选择性的氨解。这些结果突出了CMM在有效形成非编码酰胺作为潜在的肽等排体中的实用性。