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-Structure paper
| タイトル | Structural insight into substrate and inhibitor discrimination by human P-glycoprotein. |
|---|---|
| ジャーナル・号・ページ | Science, Vol. 363, Issue 6428, Page 753-756, Year 2019 |
| 掲載日 | 2019年2月15日 |
著者 | Amer Alam / Julia Kowal / Eugenia Broude / Igor Roninson / Kaspar P Locher / ![]() |
| PubMed 要旨 | ABCB1, also known as P-glycoprotein, actively extrudes xenobiotic compounds across the plasma membrane of diverse cells, which contributes to cellular drug resistance and interferes with therapeutic ...ABCB1, also known as P-glycoprotein, actively extrudes xenobiotic compounds across the plasma membrane of diverse cells, which contributes to cellular drug resistance and interferes with therapeutic drug delivery. We determined the 3.5-angstrom cryo-electron microscopy structure of substrate-bound human ABCB1 reconstituted in lipidic nanodiscs, revealing a single molecule of the chemotherapeutic compound paclitaxel (Taxol) bound in a central, occluded pocket. A second structure of inhibited, human-mouse chimeric ABCB1 revealed two molecules of zosuquidar occupying the same drug-binding pocket. Minor structural differences between substrate- and inhibitor-bound ABCB1 sites are amplified toward the nucleotide-binding domains (NBDs), revealing how the plasticity of the drug-binding site controls the dynamics of the adenosine triphosphate-hydrolyzing NBDs. Ordered cholesterol and phospholipid molecules suggest how the membrane modulates the conformational changes associated with drug binding and transport. |
リンク | Science / PubMed:30765569 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.5 - 3.9 Å |
| 構造データ | EMDB-4536, PDB-6qee: EMDB-4539, PDB-6qex: ![]() EMDB-4540: ![]() EMDB-4541: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-ZQU: ![]() ChemComp-CLR: ![]() ChemComp-3PE: ![]() ChemComp-TA1: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / ABCB1 / p-glycoprotein / p-gp / multidrug transporter / ABC transporter / zosuquidar / membrane transporter / multidrug exporter |
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