Penmatsa Aravind, Wang Kevin H, Gouaux Eric
Vollum Institute, Oregon Health & Science University, Portland OR.
Nat Struct Mol Biol. 2015 Jun;22(6):506-508. doi: 10.1038/nsmb.3029. Epub 2015 May 11.
Most antidepressants elicit their therapeutic benefits through selective blockade of Na(+)/Cl(-)-coupled neurotransmitter transporters. Here we report X-ray structures of the Drosophila melanogaster dopamine transporter in complexes with the polycyclic antidepressants nisoxetine or reboxetine. The inhibitors stabilize the transporter in an outward-open conformation by occupying the substrate-binding site. These structures explain how interactions between the binding pocket and substituents on the aromatic rings of antidepressants modulate drug-transporter selectivity.
大多数抗抑郁药通过选择性阻断Na(+)/Cl(-)偶联的神经递质转运体发挥治疗作用。在此,我们报道了果蝇多巴胺转运体与多环抗抑郁药尼索西汀或瑞波西汀复合物的X射线结构。抑制剂通过占据底物结合位点将转运体稳定在向外开放的构象。这些结构解释了结合口袋与抗抑郁药芳香环上取代基之间的相互作用如何调节药物-转运体的选择性。