TY - JOUR
T1 - Molecular docking characterizes substrate-binding sites and efflux modulation mechanisms within P-glycoprotein.
AU - Ferreira, Ricardo J.
AU - Ferreira, Maria José U.
AU - Dos Santos, Daniel J.V.A.
PY - 2013/7/22
Y1 - 2013/7/22
N2 - P-Glycoprotein (Pgp) is one of the best characterized ABC transporters, often involved in the multidrug-resistance phenotype overexpressed by several cancer cell lines. Experimental studies contributed to important knowledge concerning substrate polyspecificity, efflux mechanism, and drug-binding sites. This information is, however, scattered through different perspectives, not existing a unifying model for the knowledge available for this transporter. Using a previously refined structure of murine Pgp, three putative drug-binding sites were hereby characterized by means of molecular docking. The modulator site (M-site) is characterized by cross interactions between both Pgp halves herein defined for the first time, having an important role in impairing conformational changes leading to substrate efflux. Two other binding sites, located next to the inner leaflet of the lipid bilayer, were identified as the substrate-binding H and R sites by matching docking and experimental results. A new classification model with the ability to discriminate substrates from modulators is also proposed, integrating a vast number of theoretical and experimental data.
AB - P-Glycoprotein (Pgp) is one of the best characterized ABC transporters, often involved in the multidrug-resistance phenotype overexpressed by several cancer cell lines. Experimental studies contributed to important knowledge concerning substrate polyspecificity, efflux mechanism, and drug-binding sites. This information is, however, scattered through different perspectives, not existing a unifying model for the knowledge available for this transporter. Using a previously refined structure of murine Pgp, three putative drug-binding sites were hereby characterized by means of molecular docking. The modulator site (M-site) is characterized by cross interactions between both Pgp halves herein defined for the first time, having an important role in impairing conformational changes leading to substrate efflux. Two other binding sites, located next to the inner leaflet of the lipid bilayer, were identified as the substrate-binding H and R sites by matching docking and experimental results. A new classification model with the ability to discriminate substrates from modulators is also proposed, integrating a vast number of theoretical and experimental data.
UR - http://www.scopus.com/inward/record.url?scp=84880519085&partnerID=8YFLogxK
U2 - 10.1021/ci400195v
DO - 10.1021/ci400195v
M3 - Article
C2 - 23802684
AN - SCOPUS:84880519085
SN - 1549-9596
VL - 53
SP - 1747
EP - 1760
JO - Journal of Chemical Information and Modeling
JF - Journal of Chemical Information and Modeling
IS - 7
ER -