7W77

cryo-EM structure of human NaV1.3/beta1/beta2-bulleyaconitineA

Summary for 7W77

• Entry DOI: 10.2210/pdb7w77/pdb
• EMDB information: 32341
• Descriptor: Sodium channel subunit beta-1, Sodium channel subunit beta-2, Sodium channel protein type 3 subunit alpha, ... (9 entities in total)
• Functional Keywords: ion channel, drug, antagonist, membrane protein
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 3
• Total formula weight: 285991.70

Authors

Jiang, D.,Li, X. (deposition date: 2021-12-03, release date: 2022-04-06, Last modification date: 2024-10-30)

Primary citation

Li, X.,Xu, F.,Xu, H.,Zhang, S.,Gao, Y.,Zhang, H.,Dong, Y.,Zheng, Y.,Yang, B.,Sun, J.,Zhang, X.C.,Zhao, Y.,Jiang, D.
Structural basis for modulation of human Na V 1.3 by clinical drug and selective antagonist.
Nat Commun, 13:1286-1286, 2022

PubMed Abstract: Voltage-gated sodium (Na) channels play fundamental roles in initiating and propagating action potentials. Na1.3 is involved in numerous physiological processes including neuronal development, hormone secretion and pain perception. Here we report structures of human Na1.3/β1/β2 in complex with clinically-used drug bulleyaconitine A and selective antagonist ICA121431. Bulleyaconitine A is located around domain I-II fenestration, providing the detailed view of the site-2 neurotoxin binding site. It partially blocks ion path and expands the pore-lining helices, elucidating how the bulleyaconitine A reduces peak amplitude but improves channel open probability. In contrast, ICA121431 preferentially binds to activated domain IV voltage-sensor, consequently strengthens the Ile-Phe-Met motif binding to its receptor site, stabilizes the channel in inactivated state, revealing an allosterically inhibitory mechanism of Na channels. Our results provide structural details of distinct small-molecular modulators binding sites, elucidate molecular mechanisms of their action on Na channels and pave a way for subtype-selective therapeutic development.

PubMed: 35277491
DOI: 10.1038/s41467-022-28808-5

Experimental method

ELECTRON MICROSCOPY (3.3 Å)