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-Structure paper
タイトル | Structures of the TRPM5 channel elucidate mechanisms of activation and inhibition. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 28, Issue 7, Page 604-613, Year 2021 |
掲載日 | 2021年6月24日 |
著者 | Zheng Ruan / Emery Haley / Ian J Orozco / Mark Sabat / Richard Myers / Rebecca Roth / Juan Du / Wei Lü / |
PubMed 要旨 | The Ca-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca regulates TRPM5 activity remains elusive. We report cryo-EM ...The Ca-activated TRPM5 channel plays essential roles in taste perception and insulin secretion. However, the mechanism by which Ca regulates TRPM5 activity remains elusive. We report cryo-EM structures of the zebrafish TRPM5 in an apo closed state, a Ca-bound open state, and an antagonist-bound inhibited state. We define two novel ligand binding sites: a Ca site (Ca) in the intracellular domain and an antagonist site in the transmembrane domain (TMD). The Ca site is unique to TRPM5 and has two roles: modulating the voltage dependence and promoting Ca binding to the Ca site, which is conserved throughout TRPM channels. Conformational changes initialized from both Ca sites cooperatively open the ion-conducting pore. The antagonist NDNA wedges into the space between the S1-S4 domain and pore domain, stabilizing the transmembrane domain in an apo-like closed state. Our results lay the foundation for understanding the voltage-dependent TRPM channels and developing new therapeutic agents. |
リンク | Nat Struct Mol Biol / PubMed:34168372 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.3 - 3.6 Å |
構造データ | EMDB-23740, PDB-7mbp: EMDB-23741, PDB-7mbq: EMDB-23742: EMDB-23743: EMDB-23744, PDB-7mbr: EMDB-23745, PDB-7mbs: EMDB-23746, PDB-7mbt: EMDB-23747, PDB-7mbu: EMDB-23748, PDB-7mbv: |
化合物 | ChemComp-NAG: ChemComp-YUV: ChemComp-YUY: ChemComp-CA: ChemComp-HOH: ChemComp-YUS: |
由来 |
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キーワード | TRANSPORT PROTEIN / Ion channel / TRP channel |