Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (10): 1813.doi: 10.7503/cjcu20170202

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Analysis of Oxygen Diffusion in the Micro-channels of Quinoline Oxygenase

ZHOU Chao, SHI Ting, ZHAO Yilei, WANG Xiaolei*()   

  1. School of Life Sciences and Biotechnology, State Key Laboratory of Microbial Metabolism,Shanghai Jiaotong University, Shanghai 200240, China
  • Received:2017-04-01 Online:2017-10-10 Published:2017-09-22
  • Contact: WANG Xiaolei E-mail:thundawner@sjtu.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21377085, 21303101), the China Postdoctoral Science Foundation(Nos.2014T70413, 2014M561463) and the Center for High Performance Computing of Shanghai Jiaotong University, China

Abstract:

Oxygen diffusion pathways of quinoline oxygenase(HOD) were investigated by bioinformatics analysis, quantum chemical optimization, CAVER and MD pocket prediction, random accelerated molecular dynamics simulations and umbrella sampling. The results show that the pre-reaction site of oxygen does locate inside the active pocket, and there exists several possible oxygen tunnels in HOD, in which the one with shortest length has the highest priority. Random accelerated molecular dynamics proved that oxygen has the highest probability to exit from this tunnel, and umbrella sampling further verified its free energy for oxygen passing by is the lowest. The tunnel ended at the binding site of oxygen located on the Re-face of the substrate, which is consistent with previous studies. These results better illuminate the kinetics and the stereo-selectivity of the catalytic reaction in HOD, and also provide theoretical guidance to further experimentally improve the efficiency of oxygen usage by enzyme.

Key words: Quinoline oxygenase, Oxygendiffusion, Random accelerated molecular dynamics, Umbrella sampling

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