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Determinants Involved in the Affinity of α-Conotoxins GI and SI for the Muscle Subtype of Nicotinic Acetylcholine Receptors

Nicotinic acetylcholine receptors from muscle contain two functionally active and pharmacologically distinct acetylcholine-binding sites located at the α/γ and α/δ subunit interfaces. The α-conotoxins are competitive antagonists of nicotinic receptors and can be highly site-selective, displaying gre...

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Published in:Biochemistry (Easton) 1997-05, Vol.36 (21), p.6469-6474
Main Authors: Groebe, Duncan R, Gray, William R, Abramson, Stewart N
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cited_by cdi_FETCH-LOGICAL-a379t-dea68cc8eb8feaa9527342dea70100ca7682fab1a10558c9cbc60d3178a15a543
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container_title Biochemistry (Easton)
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creator Groebe, Duncan R
Gray, William R
Abramson, Stewart N
description Nicotinic acetylcholine receptors from muscle contain two functionally active and pharmacologically distinct acetylcholine-binding sites located at the α/γ and α/δ subunit interfaces. The α-conotoxins are competitive antagonists of nicotinic receptors and can be highly site-selective, displaying greater than 10 000-fold differences in affinities for the two acetylcholine-binding sites on a single nicotinic receptor. The higher affinity site for α-conotoxins GI, MI, and SI is the α/δ site on mouse muscle-derived BC3H-1 receptors. However, α-conotoxins GI and MI exhibit higher affinity for the other site (α/γ site) on nicotinic receptors from Torpedo californica electric organ. α-Conotoxin SI does not distinguish between the two acetylcholine-binding sites on Torpedo receptors. In this study, α-conotoxins [K10H]SI and [K10N]SI displayed wild-type affinity for the two acetylcholine-binding sites on BC3H-1 receptors but a 10−20-fold decrease in apparent affinity at one of the two acetylcholine-binding sites on Torpedo receptors. α-Conotoxin [P9K]SI displayed a selective and dramatic increase in the apparent affinity for the α/δ site of BC3H-1 receptors and for the α/γ site of Torpedo receptors. α-Conotoxin [R9A]GI displayed a reduction in affinity for both acetylcholine-binding sites on BC3H-1 receptors, although the extent of its selectivity for the α/δ site was retained. α-Conotoxin [R9A]GI also displayed a loss of affinity for the two acetylcholine-binding sites on Torpedo receptors, but its site-selectivity was apparently abolished. These results indicate that positions 9 and 10 in α-conotoxins GI and SI are involved in complex species- and subunit-dependent interactions with nicotinic receptors.
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The α-conotoxins are competitive antagonists of nicotinic receptors and can be highly site-selective, displaying greater than 10 000-fold differences in affinities for the two acetylcholine-binding sites on a single nicotinic receptor. The higher affinity site for α-conotoxins GI, MI, and SI is the α/δ site on mouse muscle-derived BC3H-1 receptors. However, α-conotoxins GI and MI exhibit higher affinity for the other site (α/γ site) on nicotinic receptors from Torpedo californica electric organ. α-Conotoxin SI does not distinguish between the two acetylcholine-binding sites on Torpedo receptors. In this study, α-conotoxins [K10H]SI and [K10N]SI displayed wild-type affinity for the two acetylcholine-binding sites on BC3H-1 receptors but a 10−20-fold decrease in apparent affinity at one of the two acetylcholine-binding sites on Torpedo receptors. α-Conotoxin [P9K]SI displayed a selective and dramatic increase in the apparent affinity for the α/δ site of BC3H-1 receptors and for the α/γ site of Torpedo receptors. α-Conotoxin [R9A]GI displayed a reduction in affinity for both acetylcholine-binding sites on BC3H-1 receptors, although the extent of its selectivity for the α/δ site was retained. α-Conotoxin [R9A]GI also displayed a loss of affinity for the two acetylcholine-binding sites on Torpedo receptors, but its site-selectivity was apparently abolished. 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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Animals
Binding Sites - drug effects
Cell Line
Conotoxins
Electric Organ - metabolism
Freshwater
Mice
Mollusk Venoms - metabolism
Muscle, Skeletal - metabolism
Nicotinic Antagonists - pharmacology
Peptides, Cyclic - metabolism
Receptors, Nicotinic - drug effects
Receptors, Nicotinic - metabolism
Torpedo
Torpedo californica
Tubocurarine - analogs & derivatives
Tubocurarine - pharmacology
title Determinants Involved in the Affinity of α-Conotoxins GI and SI for the Muscle Subtype of Nicotinic Acetylcholine Receptors
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