Transmembrane domain 3 is a transplantable pharmacophore in the photodynamic activation of cholecystokinin 1 receptor (代表作2)
Transmembrane domain 3 is a transplantable pharmacophore in the photodynamic activation of cholecystokinin 1 receptor (代表作2)
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DOI：
10.1021/acsptsci.2c00031
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Cui ZJ
中科院分区：
文献类型：
--
作者：
Li Y;Cui ZJ
Cholecystokinin 1 receptor (CCK1R) is activated in photodynamic action by singlet oxygen, but detailed molecular mechanisms are not elucidated. To identify the pharmacophore(s) in photodynamic CCK1R activation, we examined photodynamic activation of point mutants CCK1RM121/3.32A, CCK1RM121/3.32Q, and a chimeric receptor with CCK1R transmembrane domain 3 (TM3) transplanted to muscarinic ACh receptor 3 (M3R) which is unaffected by photodynamic action. These engineered receptors were tagged at N-terminus with genetically encoded protein photosensitizer miniSOG, and their light-driven photodynamic activation was compared to wild type CCK1R and M3R, as monitored by Fura-2 fluorescent calcium imaging. Photodynamic activation of miniSOG-CCK1RM121/3.32A and miniSOG-CCK1RM121/3.32Q was found to be 55% and 73% respectively when compared to miniSOG-CCK1R (100%), whereas miniSOG-M3R was not affected (0% activation). Notably, the chimeric receptor miniSOG-M3R-TM3CCK1R was effectively activated photodynamically (65%). These data suggest that TM3 is an important pharmacophore in photodynamic CCK1R activation, readily transplantable to non-susceptible M3R for photodynamic activation.
