Inactivation-mimicking block of the epithelial calcium channel TRPV6
| Autor: | Matthias A. Hediger, Rajesh Bhardwaj, Micael Rodrigues Cunha, Appu K. Singh, Jean-Louis Reymond, Isabella Derler, Sonja Lindinger, Christoph Romanin, Arthur Neuberger, Gergely Gyimesi, Kirill D. Nadezhdin, Alexander I. Sobolevsky |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
TRPV6
Calmodulin TRPV Cation Channels 610 Medicine & health 03 medical and health sciences 0302 clinical medicine Structural Biology 540 Chemistry Humans Binding site Ion channel Research Articles 030304 developmental biology Calcium metabolism 0303 health sciences Multidisciplinary biology Calcium channel Mutagenesis Cryoelectron Microscopy SciAdv r-articles biology.protein Molecular mechanism Biophysics 570 Life sciences Calcium Calcium Channels 030217 neurology & neurosurgery Research Article |
| Zdroj: | Bhardwaj, Rajesh; Lindinger, Sonja; Neuberger, Arthur; Nadezhdin, Kirill D.; Singh, Appu K.; R. Cunha, Micael; Derler, Isabella; Gyimesi, Gergely; Reymond, Jean-Louis; Hediger, Matthias A.; Romanin, Christoph; Sobolevsky, Alexander I. (2020). Inactivation-mimicking block of the epithelial calcium channel TRPV6. Science Advances, 6(48), eabe1508. American Association for the Advancement of Science 10.1126/sciadv.abe1508 Science Advances |
| DOI: | 10.7892/boris.148887 |
| Popis: | Small-molecule piperazine derivatives mimic inactivation by calmodulin to selectively and potently block TRPV6 channels. Epithelial calcium channel TRPV6 plays vital roles in calcium homeostasis, and its dysregulation is implicated in multifactorial diseases, including cancers. Here, we study the molecular mechanism of selective nanomolar-affinity TRPV6 inhibition by (4-phenylcyclohexyl)piperazine derivatives (PCHPDs). We use x-ray crystallography and cryo–electron microscopy to solve the inhibitor-bound structures of TRPV6 and identify two types of inhibitor binding sites in the transmembrane region: (i) modulatory sites between the S1-S4 and pore domains normally occupied by lipids and (ii) the main site in the ion channel pore. Our structural data combined with mutagenesis, functional and computational approaches suggest that PCHPDs plug the open pore of TRPV6 and convert the channel into a nonconducting state, mimicking the action of calmodulin, which causes inactivation of TRPV6 channels under physiological conditions. This mechanism of inhibition explains the high selectivity and potency of PCHPDs and opens up unexplored avenues for the design of future-generation biomimetic drugs. |
| Databáze: | OpenAIRE |
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