ATP activates bestrophin ion channels through direct interaction.
ATP activates bestrophin ion channels through direct interaction.
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ATP 通过直接相互作用激活卵黄蛋白离子通道
DOI:
10.1038/s41467-018-05616-4
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发表时间:
2018-08-07
影响因子:
16.6
通讯作者:
Yang T
中科院分区:
文献类型:
--
作者:
Zhang Y;Kittredge A;Ward N;Ji C;Chen S;Yang T
Human Bestrophin1 (hBest1) is a Ca2+-activated Cl− channel in retinal pigment epithelium (RPE) essential for retina physiology, and its mutation results in retinal degenerative diseases that have no available treatments. Here, we discover that hBest1’s channel activity in human RPE is significantly enhanced by adenosine triphosphate (ATP) in a dose-dependent manner. We further demonstrate a direct interaction between ATP and bestrophins, and map the ATP-binding motif on hBest1 to an intracellular loop adjacent to the channel activation gate. Importantly, a disease-causing mutation of hBest1 located within the ATP-binding motif, p.I201T, diminishes ATP-dependent activation of the channel in patient-derived RPE, while the corresponding mutants in bestrophin homologs display defective ATP binding and a conformational change in the ATP-binding motif. Taken together, our results identify ATP as a critical activator of bestrophins, and reveal the molecular mechanism of an hBest1 patient-specific mutation. Human Bestrophin1 (hBest1), a calcium-activated chloride channel in retinal pigment epithelium (RPE), is essential for retina physiology. Using electrophysiological and structural approaches, the authors uncover an ATP-dependent activation mechanism of hBest1, and identify an ATP-binding motif.
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DOI:
10.1085/jgp.200609581
发表时间:
2006-09
期刊:
The Journal of general physiology
影响因子:
--
作者:
Chien LT;Zhang ZR;Hartzell HC
通讯作者:
Hartzell HC
影响因子:
12.4
作者:
Yang, Tingting;Justus, Sally;Tsang, Stephen H.
通讯作者:
Tsang, Stephen H.
影响因子:
4.8
作者:
Mak, DOD;McBride, S;Foskett, JK
通讯作者:
Foskett, JK
影响因子:
14.8
作者:
通讯作者:
--
影响因子:
9.8
作者:
Davidson, Alice E.;Millar, Ian D.;Manson, Forbes D. C.
通讯作者:
Manson, Forbes D. C.