Investigating<i>Saccharomyces cerevisiae</i>alkene reductase OYE 3 by substrate profiling, X-ray crystallography and computational methods
作者:Robert W. Powell, III、M. Pilar Buteler、Sunidhi Lenka、Michele Crotti、Sara Santangelo、Matthew J. Burg、Steven Bruner、Elisabetta Brenna、Adrian E. Roitberg、Jon D. Stewart
DOI:10.1039/c8cy00440d
日期:——
X-ray crystal structures of unliganded and phenol-bound OYE 3 were solved to 1.8 and 1.9 Å resolution, respectively. Both structures were nearly identical to that of OYE 1, with only a single amino acid difference in the active site region (Ser 296 versus Phe 296, part of loop 6). Despite their essentially identical static X-ray structures, molecular dynamics (MD) simulations revealed that loop 6 conformations
酿酒酵母OYE 3与经过充分研究的巴斯德酵母OYE 1具有80%的序列同一性;而酿酒酵母OYE 3具有80%的序列同一性。然而,野生型OYE 3对某些烯烃底物表现出不同的立体选择性。在OYE 3中对Trp 116进行位点饱和诱变,然后进行底物谱分析表明,该突变的影响相对较小,与以前在OYE 1中观察到的相反。未配体和与酚结合的OYE 3的X射线晶体结构解析为1.8和1.9Å分辨率。两种结构都几乎与OYE 1相同,在活性位点区域只有一个氨基酸差异(Ser 296对Phe 296,循环6的一部分)。尽管它们具有基本相同的静态X射线结构,但分子动力学(MD)模拟显示,在OYE 3和OYE 1之间的溶液中,环6构象存在显着差异。在OYE 3中,环6保持与晶体结构中观察到的几乎一样的开放状态。相比之下,回路6在OYE 1的活性位点上闭合了约5%。4Å。与OYE 3相比,闭环闭合可能会为与OYE 1结