8j7h
ion channel
Structural highlights
FunctionR1FVI4_EMIHU R1EKX3_EMIHU GFP_AEQVI Energy-transfer acceptor. Its role is to transduce the blue chemiluminescence of the protein aequorin into green fluorescent light by energy transfer. Fluoresces in vivo upon receiving energy from the Ca(2+)-activated photoprotein aequorin. Publication Abstract from PubMedVoltage-gated sodium (Na(V)) channels mediate a plethora of electrical activities. Na(V) channels govern cellular excitability in response to depolarizing stimuli. Inactivation is an intrinsic property of Na(V) channels that regulates cellular excitability by controlling the channel availability. The fast inactivation, mediated by the Ile-Phe-Met (IFM) motif and the N-terminal helix (N-helix), has been well-characterized. However, the molecular mechanism underlying Na(V) channel slow inactivation remains elusive. Here, we demonstrate that the removal of the N-helix of Na(V)Eh (Na(V)Eh(DeltaN)) results in a slow-inactivated channel, and present cryo-EM structure of Na(V)Eh(DeltaN) in a potential slow-inactivated state. The structure features a closed activation gate and a dilated selectivity filter (SF), indicating that the upper SF and the inner gate could serve as a gate for slow inactivation. In comparison to the Na(V)Eh structure, Na(V)Eh(DeltaN) undergoes marked conformational shifts on the intracellular side. Together, our results provide important mechanistic insights into Na(V) channel slow inactivation. Structural mechanism of voltage-gated sodium channel slow inactivation.,Chen H, Xia Z, Dong J, Huang B, Zhang J, Zhou F, Yan R, Shi Y, Gong J, Jiang J, Huang Z, Jiang D Nat Commun. 2024 May 1;15(1):3691. doi: 10.1038/s41467-024-48125-3. PMID:38693179[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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