Insights Into the Molecular Mechanism of Triptan Transport by P-glycoprotein.
Insights Into the Molecular Mechanism of Triptan Transport by P-glycoprotein.
复制标题
深入了解 P-糖蛋白传输曲普坦的分子机制。
DOI:
10.1016/j.xphs.2017.02.032
复制
发表时间:
2017
影响因子:
3.8
通讯作者:
Roberts,ArthurG
中科院分区:
文献类型:
--
作者:
Wilt,LauraA;Nguyen,Diana;Roberts,ArthurG
The P-glycoprotein (Pgp) transporter reduces the penetration of a chemically diverse range of neurotherapeutics at the blood–brain barrier, but the molecular features of drugs and drug–Pgp interactions that drive transport remain to be clarified. In particular, the triptan neurotherapeutics, eletriptan (ETT) and sumatriptan (STT), were identified to have a >10-fold difference in transport rates despite being from the same drug class. Consistent with these transport differences, ETT activated Pgp-mediated ATP hydrolysis ∼2-fold, whereas STT slightly inhibited Pgp-mediated ATP hydrolysis by ∼10%. The interactions between them were also noncompetitive, suggesting that they occupy different binding sites on the transporter. Despite these differences, protein fluorescence spectroscopy revealed that the drugs have similar affinity to the transporter. NMR with Pgp and the drugs showed that they have distinct interactions with the transporter. Tertiary conformational changes probed by acrylamide quenching of Pgp tryptophan fluorescence with the drugs and a nonhydrolyzable ATP analog implied that the STT-bound Pgp must undergo larger conformational changes to hydrolyze ATP than ETT-bound Pgp. These results and previous transport studies were used to build a conformationally driven model for triptan transport with Pgp where STT presents a higher conformational barrier for ATP hydrolysis and transport than ETT.
登录
查看更多内容
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
N. Cutler;J. Sramek;M. Murphy;H. Riordan;P. Bieck;A. Carta
通讯作者:
A. Carta
影响因子:
2.9
作者:
CHIFFLET, S;TORRIGLIA, A;TOLOSA, S
通讯作者:
TOLOSA, S
影响因子:
3.7
作者:
Stephan Döppenschmitt;H. Spahn‐Langguth;C. Regårdh;P. Langguth
通讯作者:
P. Langguth
影响因子:
4.8
作者:
Paul D. W. Eckford;F. Sharom
通讯作者:
F. Sharom
影响因子:
1.5
作者:
F. Wedler
通讯作者:
F. Wedler