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Science 16 September 1994:
Vol. 265. no. 5179, pp. 1724 - 1728
DOI: 10.1126/science.8085162

Articles

Science, Vol 265, Issue 5179, 1724-1728
Copyright © 1994 by American Association for the Advancement of Science


articles

Molecular determinants of state-dependent block of Na+ channels by local anesthetics

DS Ragsdale, JC McPhee, T Scheuer, and WA Catterall

Department of Pharmacology, University of Washington, Seattle 98195.

Sodium ion (Na+) channels, which initiate the action potential in electrically excitable cells, are the molecular targets of local anesthetic drugs. Site-directed mutations in transmembrane segment S6 of domain IV of the Na+ channel alpha subunit from rat brain selectively modified drug binding to resting or to open and inactivated channels when expressed in Xenopus oocytes. Mutation F1764A, near the middle of this segment, decreased the affinity of open and inactivated channels to 1 percent of the wild-type value, resulting in almost complete abolition of both the use-dependence and voltage-dependence of drug block, whereas mutation N1769A increased the affinity of the resting channel 15-fold. Mutation I1760A created an access pathway for drug molecules to reach the receptor site from the extracellular side. The results define the location of the local anesthetic receptor site in the pore of the Na+ channel and identify molecular determinants of the state-dependent binding of local anesthetics.


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Differential Interaction of R-Mexiletine with the Local Anesthetic Receptor Site on Brain and Heart Sodium Channel alpha -Subunits.
T. Weiser, Y. Qu, W. A. Catterall, and T. Scheuer (1999)
Mol. Pharmacol. 56, 1238-1244
   Abstract »    Full Text »
Voltage-Gated Ion Channels and Hereditary Disease.
F. Lehmann-Horn and K. Jurkat-Rott (1999)
Physiol Rev 79, 1317-1372
   Abstract »    Full Text »    PDF »
Point Mutations at N434 in D1-S6 of {micro}1 Na+ Channels Modulate Binding Affinity and Stereoselectivity of Local Anesthetic Enantiomers.
C. Nau, S.-Y. Wang, G. R. Strichartz, and G. K. Wang (1999)
Mol. Pharmacol. 56, 404-413
   Abstract »    Full Text »
Local Anesthetic Anchoring to Cardiac Sodium Channels : Implications Into Tissue-Selective Drug Targeting.
R. A. Li, R. G. Tsushima, K. Himmeldirk, D. S. Dime, and P. H. Backx (1999)
Circ. Res. 85, 88-98
   Abstract »    Full Text »    PDF »
Structure and function of the cardiac sodium channels.
J. R. Balser (1999)
Cardiovasc Res 42, 327-328
   Abstract »    Full Text »    PDF »
Intrinsic lidocaine affinity for Na channels expressed in Xenopus oocytes depends on {alpha} (hH1 vs. rSkM1) and {beta}1 subunits.
J. C Makielski, J. Limberis, Z. Fan, and J. W Kyle (1999)
Cardiovasc Res 42, 503-509
   Abstract »    Full Text »    PDF »
Whether "Slip-Mode Conductance" Occurs.
H. B. Nuss, E. Marbán;, C. W. Balke, L. Goldman, R. Aggarwal, S. R. Shorofsky;, J. dos Santos Cruz, L. F. Santana, C. A. Frederick, L. L. Isom, et al. (1999)
Science 284, 711a-711
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Block of Brain Sodium Channels by Peptide Mimetics of the Isoleucine, Phenylalanine, and Methionine (IFM) Motif from the Inactivation Gate.
G. Eaholtz, A. Colvin, D. Leonard, C. Taylor, and W. A. Catterall (1999)
J. Gen. Physiol. 113, 279-294
   Abstract »    Full Text »    PDF »
The Position of the Fast-Inactivation Gate during Lidocaine Block of Voltage-gated Na+ Channels.
V. Vedantham and S. C. Cannon (1999)
J. Gen. Physiol. 113, 7-16
   Abstract »    Full Text »    PDF »
A Molecular Basis for the Different Local Anesthetic Affinities of Resting Versus Open and Inactivated States of the Sodium Channel.
H.-L. Li, A. Galue, L. Meadows, and D. S. Ragsdale (1999)
Mol. Pharmacol. 55, 134-141
   Abstract »    Full Text »



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