π-π Stacking mediated drug-drug interactions in human CYP2E1.
Because of having many low molecular mass substrates, CYP2E1 is of particular interests to the pharmaceutical industry. Many evidences showed that this enzyme can adopt multiple substrates to significantly reduce the oxidation rate of the substrates. The detailed mechanism for this observation is still unclear. In the current study, we employed GPU-accelerated molecular dynamics simulations to study the multiple-binding mode of human CYP2E1, with an aim of offering a mechanistic explanation for the unexplained multiple-substrate binding. Our results showed that Thr303 and Phe478 were key factors for the substrate recognition and multiple-substrate binding. The former can form a significant hydrogen bond to recognize and position the substrate in the productive binding orientation in the active site. The latter acted as a mediator for the substrate communications via π-π stacking interactions. In the multiple-binding mode, the aforementioned π-π stacking interactions formed by the aromatic rings of both substrates and Phe478 drove the first substrate far away from the catalytic center, orienting in an additional binding position and going against the substrate metabolism. All these findings could give atomic insights into the detailed mechanism for the multiple-substrate binding in human CYP2E1, providing useful information for the drug metabolism mechanism and personalized use of clinical drugs.
Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, Shanghai 200240, China.
Yue
Y
Liu
Bing-Ya
BY
Liu
Pei
P
Hao
Xuan
X
Li
Yi-Xue
YX
Li
Jing-Fang
JF
Wang
D001665:Binding Sites; D019392:Cytochrome P-450 CYP2E1 / Q000737:chemistry / Q000378:metabolism*; D004347:Drug Interactions; D006801:Humans; D056004:Molecular Dynamics Simulation; D004364:Pharmaceutical Preparations / Q000378:metabolism*; D011485:Protein Binding; D013379:Substrate Specificity
D004364:Pharmaceutical Preparations; D019392:Cytochrome P-450 CYP2E1