NDLI: Size Matters: Erythromelalgia Mutation S241T in Nav1.7 Alters Channel Gating

Content Provider	Journal of Biological Chemistry (JBC)
Author	Lampert, Angelika Dib-Hajj, Sulayman D. Tyrrell, Lynda Waxman, Stephen G.
Abstract	The Nav1.7 sodium channel is preferentially expressed in most nociceptive dorsal root ganglion neurons and in sympathetic neurons. Inherited erythromelalgia (IEM, also known as erythermalgia), an autosomal dominant neuropathy characterized by burning pain in the extremities in response to mild warmth, has been linked to mutations in Nav1.7. Recently, a substitution of Ser-241 by threonine (S241T) in the domain I S4-S5 linker of Nav1.7 was identified in a family with IEM. To investigate the possible causative role of this mutation in the pathophysiology of IEM, we used whole-cell voltage-clamp analysis to study the effects of S241T on Nav1.7 gating in HEK293 cells. We found a hyperpolarizing shift of activation midpoint by 8.4 mV, an accelerated time to peak, slowing of deactivation, and an increase in the current in response to small, slow depolarizations. Additionally, S241T produced an enhancement of slow inactivation, shifting the midpoint by -12.3 mV. Because serine and threonine have similar biochemical properties, the S241T substitution suggested that the size of the side chain at this position affected channel gating. To test this hypothesis, we investigated the effect of S241A and S241L substitutions on the gating properties of Nav1.7. Although S241A did not alter the properties of the channel, S241L mimicked the effects of S241T. We conclude that the linker between S4 and S5 in domain I of Nav1.7 modulates gating of this channel, and that a larger side chain at position 241 interferes with its gating mechanisms.
Related Links	http://www.jbc.org/content/281/47/36029.abstract
Ending Page	36035
Starting Page	36029
Page Count	7
File Format	HTM / HTML PDF
ISSN	00219258
Journal	Journal of Biological Chemistry (JBC)
Issue Number	47
Volume Number	281
DOI	10.1074/jbc.M607637200
e-ISSN	1083351X
Language	English
Publisher	American Society for Biochemistry and Molecular Biology
Publisher Date	2006-11-24
Access Restriction	Open
Subject Keyword	Membrane Transport, Structure, Function, and Biogenesis
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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