Download MendeleyStructural basis for a central permeation pathway in the P2X1 receptor.
Zhang, H., Wu, P., Gu, Z., Xu, Y., Hu, W., Yuan, Q., Xia, B., Xu, H.E., Gao, Z.(2026) Cell Discov 12
- PubMed: 42243080 Search on PubMedSearch on PubMed Central
- DOI: https://doi.org/10.1038/s41421-026-00881-w
- Primary Citation Related Structures:
8ZT1, 8ZT2, 8ZT5, 8ZT8, 8ZTA, 8ZTD, 8ZTF, 9XQR - PubMed Abstract:
The ion permeation pathway is a critical determinant of ion channel function and selectivity; however, the structural basis for ion permeation in the P2X1 receptor, an ATP-gated ion channel crucial for platelet activation, thrombosis, and male infertility, remains incompletely understood. Here, we present high-resolution cryo-electron microscopy (cryo-EM) structures of the P2X1 receptor, which reveal a central ion permeation pathway spanning the entire extracellular domain, complementing the existing paradigms of ion channel architecture for the P2X receptor family. Within this pathway, we identify specific sites that coordinate hydrated calcium ions, including an aspartate ring that acts as a selectivity filter at the apex of the central vestibule. We also discover that a small molecule, 3,5-bis(trifluoromethyl)aniline, binds at the top of the central vestibule and potently inhibits cation flux through this central permeation pathway. Our findings reveal a new inhibitor-binding site in the P2X1 receptor. These insights provide a structural framework for the rational design of subtype-specific P2X receptor inhibitors targeting the central vestibule.
- The State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.
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