7K4C

Cryo-EM structure of human TRPV6 in complex with (4- phenylcyclohexyl)piperazine inhibitor Br-cis-22a

7K4C の概要

• エントリーDOI: 10.2210/pdb7k4c/pdb
• 関連するPDBエントリー: 7K4A 7K4B
• EMDBエントリー: 22662 22663 22664
• 分子名称: Transient receptor potential cation channel subfamily V member 6, 1-(5-bromopyridin-3-yl)-4-[cis-4-(3-methylphenyl)cyclohexyl]piperazine, CALCIUM ION (3 entities in total)
• 機能のキーワード: trpv6, ion channel, inhibitor, membrane protein, membrane protein-inhibitor complex, membrane protein/inhibitor
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 310239.29

構造登録者

Neuberger, A.,Nadezhdin, K.D.,Singh, A.K.,Sobolevsky, A.I. (登録日: 2020-09-15, 公開日: 2020-12-09, 最終更新日: 2024-03-06)

主引用文献

Bhardwaj, R.,Lindinger, S.,Neuberger, A.,Nadezhdin, K.D.,Singh, A.K.,Cunha, M.R.,Derler, I.,Gyimesi, G.,Reymond, J.L.,Hediger, M.A.,Romanin, C.,Sobolevsky, A.I.
Inactivation-mimicking block of the epithelial calcium channel TRPV6.
Sci Adv, 6:-, 2020

PubMed Abstract: 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.

PubMed: 33246965
DOI: 10.1126/sciadv.abe1508

実験手法

ELECTRON MICROSCOPY (3.78 Å)