Force-induced motions of the PIEZO1 blade probed with fluorimetry.
Force-induced motions of the PIEZO1 blade probed with fluorimetry.
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使用荧光测定法探测 PIEZO1 叶片的力引起运动。
DOI:
10.1016/j.celrep.2023.112837
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发表时间:
2023-08-29
期刊:
影响因子:
8.8
通讯作者:
中科院分区:
文献类型:
--
作者:
Mechanical forces are thought to activate mechanosensitive PIEZO channels by changing the conformation of a large transmembrane blade domain. Yet, whether different stimuli induce identical conformational changes in this domain remains unclear. Here, we repurpose a cyclic permuted green fluorescent protein as a conformation-sensitive probe to track local rearrangements along the PIEZO1 blade. Two independent probes, one inserted in an extracellular site distal to the pore and the other in a distant intracellular proximal position, elicit sizable fluorescence signals when the tagged channels activate in response to fluid shear stress of low intensity. Neither cellular indentations nor osmotic swelling of the cell elicit detectable fluorescence signals from either probe, despite the ability of these stimuli to activate the tagged channels. High-intensity flow stimuli are ineffective at eliciting fluorescence signals from either probe. Together, these findings suggest that low-intensity fluid shear stress causes a distinct form of mechanical stress to the cell. Ozkan et al. use conformation-sensitive fluorescent probes to track force-induced rearrangements of PIEZO1’s mechanosensory blade domains. Two probes inserted far apart in the blade independently “light up” as channels activate in response to low-intensity fluid shear stress but not to other tested mechanical stimuli.
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Martinac B
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