Lifetime of M Intermediate in the D96N Mutant of Bacteriorhodopsin Determined by a Photoelectrochemical Method
作者:Koichi Koyama、Tsutomu Miyasaka、Richard Needleman、Janos K. Lanyi
DOI:10.1246/cl.1999.769
日期:1999.8
The recombinant D96N mutant of bacteriorhodopsin (bR) was immobilized on SnO2 electrode that contacts an aqueous electrolyte. By laser pulse excitation, photocurrent behavior of D96N was analyzed to evaluate the lifetime of the M intermediate involved in proton transfer reactions. The half-life of the M intermediate in the photocycle was about 5 s, which is 103-fold longer than that of wild-type and shows the crucial role of D96 in the uptake of protons.
将细菌视紫红质 (bR) 的重组 D96N 突变体固定在接触水性电解质的 SnO2 电极上。通过激光脉冲激发,分析 D96N 的光电流行为,以评估参与质子转移反应的 M 中间体的寿命。 M中间体在光循环中的半衰期约为5秒,比野生型长103倍,显示了D96在质子摄取中的关键作用。