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-Structure paper
タイトル | High-affinity agonism at the P2X receptor is mediated by three residues outside the orthosteric pocket. |
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ジャーナル・号・ページ | Nat Commun, Vol. 15, Issue 1, Page 6662, Year 2024 |
掲載日 | 2024年8月6日 |
![]() | Adam C Oken / Nicolas E Lisi / Ipsita Krishnamurthy / Alanna E McCarthy / Michael H Godsey / Arthur Glasfeld / Steven E Mansoor / ![]() |
PubMed 要旨 | P2X receptors are trimeric ATP-gated ion channels that activate diverse signaling cascades. Due to its role in apoptotic pathways, selective activation of P2X is a potential experimental tool and ...P2X receptors are trimeric ATP-gated ion channels that activate diverse signaling cascades. Due to its role in apoptotic pathways, selective activation of P2X is a potential experimental tool and therapeutic approach in cancer biology. However, mechanisms of high-affinity P2X activation have not been defined. We report high-resolution cryo-EM structures of wild-type rat P2X bound to the high-affinity agonist BzATP as well as significantly improved apo receptor structures in the presence and absence of sodium. Apo structures define molecular details of pore architecture and reveal how a partially hydrated Na ion interacts with the conductance pathway in the closed state. Structural, electrophysiological, and direct binding data of BzATP reveal that three residues just outside the orthosteric ATP-binding site are responsible for its high-affinity agonism. This work provides insights into high-affinity agonism for any P2X receptor and lays the groundwork for development of subtype-specific agonists applicable to cancer therapeutics. |
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手法 | EM (単粒子) |
解像度 | 2.49 - 2.78 Å |
構造データ | EMDB-41570, PDB-8tr5: EMDB-41581, PDB-8trj: EMDB-42976, PDB-8v4s: |
化合物 | ![]() ChemComp-GDP: ![]() ChemComp-ZN: ![]() ChemComp-NAG: ![]() ChemComp-PLM: ![]() ChemComp-NA: ![]() ChemComp-HOH: ![]()
ChemComp-KD9: |
由来 |
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![]() | MEMBRANE PROTEIN / Ion Channel / Ligand-gate Ion Channel / P2X Receptor / Allosteric Antagonist / High-Affinity Agonist |