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-Structure paper
| タイトル | Subtype-specific structural features of the hearing loss-associated human P2X2 receptor. |
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| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 37, Page e2417753122, Year 2025 |
| 掲載日 | 2025年9月16日 |
著者 | Franka G Westermann / Adam C Oken / Philip K E Granith / Parthiban Marimuthu / Christa E Müller / Steven E Mansoor / ![]() |
| PubMed 要旨 | The P2X2 receptor (P2X2R) is a slowly desensitizing adenosine triphosphate (ATP)-gated ion channel that is highly expressed in the cochlea. When mutated, the P2X2R exacerbates age- and noise-related ...The P2X2 receptor (P2X2R) is a slowly desensitizing adenosine triphosphate (ATP)-gated ion channel that is highly expressed in the cochlea. When mutated, the P2X2R exacerbates age- and noise-related hearing loss, but selective modulators of the receptor are lacking, and the molecular basis of activation and desensitization remains poorly understood. Here, we determine high-resolution cryoelectron microscopy structures of the full-length wild-type human P2X2R in an apo closed state and two distinct ATP-bound desensitized states. In the apo closed state structure, we observe features unique to the P2X2R and locate disease mutations within or near the transmembrane domain. In addition, our ATP-bound structures show how free anionic ATP forms subtype-specific interactions with the orthosteric binding site. We identify and characterize two different ATP-bound desensitized state structures, one similar to published models for other P2XR subtypes, and a second alternate conformation not previously observed. A loop adjacent to the orthosteric binding site between these two ATP-bound desensitized state structures undergoes significant conformational changes. These movements are supported by multireplicate, microsecond-scale molecular dynamics simulation studies and suggest a path by which ATP could enter or leave the orthosteric pocket. Together, our results provide structural insights into the P2X2R, facilitating structure-based drug development for this therapeutically important target. |
リンク | Proc Natl Acad Sci U S A / PubMed:40938707 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.49 - 2.71 Å |
| 構造データ | EMDB-46781, PDB-9ddv: EMDB-46782, PDB-9ddw: EMDB-46783, PDB-9ddx: |
| 化合物 | ![]() ChemComp-NAG: ![]() ChemComp-HOH: ![]() ChemComp-ATP: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Ion Channel / Ligand-gated Ion Channel / P2X Receptor / P2XR / ATP |
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