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Nicotine binding to native and substituted peptides comprising residues 188-207 of nicotinic acetylcholine receptor alpha1, alpha2, alpha3, alpha4, alpha5, and alpha7 subunits.

Abstract：

:Structural determinants of L-[(3)H]nicotine binding to synthetic peptides comprising residues 188-207 of nicotinic acetylcholine receptor alpha subunits were invesitigated by equilibrium binding analysis. Two binding components were detected, one of low affinity (K(d) approximately 1.5 microM) that did not differ significantly among peptides and another of high affinity. The high affinity binding component was higher for the neuronal peptides (K(d) = 14-23 nM) than the muscle alpha1 peptides (K(d) = 52 nM). The following nonconservative substitutions in the alpha4 peptide resulted in a significant decrease in nicotine affinity for the peptide: Y190A, Y190D, C192G, E195A, E195-, P199A, P199-, and Y203A. Substitution of alpha4P199 with a leucine which is present in the alpha1 sequence decreased the affinity of the alpha4 peptide for nicotine and substitution of alpha1L199 with a proline (alpha4) or a glutamine (alpha3) increased the affinity of the alpha1 peptide. It is concluded that aromatic residues contribute to the binding site for nicotine on the alpha4 subunit and that the residue present at position 199 partly determines differences in nicotine affinity for different alpha subunits.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Lentz TL

doi

10.1006/bbrc.2000.2155

subject

Has Abstract

pub_date

2000-02-16 00:00:00

pages

480-4

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)92155-7

journal_volume

268

pub_type

杂志文章

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