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Structural highlights
Publication Abstract from PubMedVoltage-gated sodium channels (Na(v)) undergo conformational shifts in response to membrane potential changes, a mechanism known as the electromechanical coupling. To delineate the structure-function relationship of human Na(v) channels, we have performed systematic structural analysis using human Na(v)1.7 as a prototype. Guided by the structural differences between wild-type (WT) Na(v)1.7 and an eleven mutation-containing variant, designated Na(v)1.7-M11, we generated three additional intermediate mutants and solved their structures at overall resolutions of 2.9-3.4 A. The mutant with nine-point mutations in the pore domain (PD), named Na(v)1.7-M9, has a reduced cavity volume and a sealed gate, with all voltage-sensing domains (VSDs) remaining up. Structural comparison of WT and Na(v)1.7-M9 pinpoints two residues that may be critical to the tightening of the PD. However, the variant containing these two mutations, Na(v)1.7-M2, or even in combination with two additional mutations in the VSDs, named Na(v)1.7-M4, failed to tighten the PD. Our structural analysis reveals a tendency of PD contraction correlated with the right shift of the static inactivation I-V curves. We predict that the channel in the resting state should have a "tight" PD with down VSDs. Dissection of the structure-function relationship of Na(v) channels.,Li Z, Wu Q, Huang G, Jin X, Li J, Pan X, Yan N Proc Natl Acad Sci U S A. 2024 Feb 27;121(9):e2322899121. doi: , 10.1073/pnas.2322899121. Epub 2024 Feb 21. PMID:38381792[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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