title: Interaction of P-glycoprotein with anti-tumor drugs: the site, gate and pathway.
abstract: Understanding the mechanism and pathway of anti-cancer drugs to be pumped out by P-glycoprotein (P-gp) in cancer cell is very important for the successful chemotherapy. P-gp is a member of ATP-binding cassette (ABC) transporters. In this study, random accelerated molecular dynamics (RAMD) simulation was used to explore the potential egress pathway of ligands from the binding pocket. This could be considered as a reverse process of drug binding. The most possible portal of drugs to dissociate is TM4/TM6, which is almost the same for different drugs, such as paclitaxel and doxorubicin. The interactions in the binding site are found to be remarkably stronger than that outside of the binding site. The results were suggested by the free energy calculation between P-gp and different drugs from metadynamics simulation. All the results indicate that the flexibility of inner residues, especially the residue Phe339, is very important for the drugs to access the binding site.
authors.affiliation: Department of Chemistry and Soft Matter Research Center, Zhejiang University, Hangzhou 310027, People's Republic of China. qiwang@zju.edu.cn michael.lijunl@gmail.com.
authors.forename: Junqiao
authors.initials: J
authors.lastname: Zhang
authors.forename: Debing
authors.initials: D
authors.lastname: Li
authors.forename: Tianyang
authors.initials: T
authors.lastname: Sun
authors.forename: Lijun
authors.initials: L
authors.lastname: Liang
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000737:chemistry / Q000378:metabolism*; D000970:Antineoplastic Agents / Q000737:chemistry / Q000378:metabolism*; D001665:Binding Sites; D004317:Doxorubicin / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D008024:Ligands; D056004:Molecular Dynamics Simulation; D017239:Paclitaxel / Q000737:chemistry* / Q000378:metabolism; D011487:Protein Conformation
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000970:Antineoplastic Agents; D008024:Ligands; D004317:Doxorubicin; D017239:Paclitaxel