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Molecular Pharmacology

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Research ArticleArticle

Importance of Phenylalanine 107 in Agonist Recognition by the 5-Hydroxytryptamine3A Receptor

Lucinda J. Steward, Frank G. Boess, Joy A. Steele, Dan Liu, Norris Wong and Ian L. Martin
Molecular Pharmacology June 2000, 57 (6) 1249-1255;
Lucinda J. Steward
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Frank G. Boess
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Joy A. Steele
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Dan Liu
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Norris Wong
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Ian L. Martin
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Abstract

The 5-hydroxytryptamine (5-HT)3 receptor is a member of the ligand-gated ion channel receptor family with significant homology to the nicotinic acetylcholine, γ-aminobutyric acidA, and glycine receptors. In this receptor class, the agonist binding site is formed by parts of the extracellular amino-terminal region. This study examines the effects of altering phenylalanine 107 (F107) of the 5-HT3AL subunit, obtained from NG108-15 cells, using site-directed mutagenesis. The wild-type (WT) and mutant receptors were expressed in HEK 293 cells and characterized using both whole-cell patch-clamp and radioligand binding. The tyrosine mutant F107Y exhibits a significantly lower affinity for the agonist 5-HT (Ki = 203 versus 15.6 nM) and an increase of similar magnitude in the EC50 value (10.6 versus 1.2 μM) compared with WT. The activation kinetics of the maximal currents generated by 5-HT with this mutant were markedly slower than those of the WT receptor, but application of supramaximal concentrations of the agonist markedly decreased the time to half-peak. The asparagine mutant F107N displayed a significantly higher affinity for 5-HT than the WT receptor (1.62 versus 15.6 nM), which was mirrored in direction and magnitude by changes in the EC50 value for this agonist (0.2 versus 1.2 μM). In contrast to the WT receptor, the mutant F107N was activated by acetylcholine (EC50 = 260 μM). The response to acetylcholine was blocked by the 5-HT3 receptor antagonist renzapride with a similar IC50 value as that determined against currents generated by 5-HT in the WT receptor. These data suggest that F107 is an important determinant of agonist recognition at the 5-HT3 receptor.

Footnotes

  • Send reprint requests to: Dr. Lucinda J. Steward, Yoshitomi Research Institute of Neuroscience in Glasgow, West Medical Building, University of Glasgow, Glasgow G12 8QQ, UK. E-mail:l.steward{at}bio.gla.ac.uk

  • The work was supported by Glaxo Canada and MRC Canada. L.J.S. held a MRC/PMAC Pfizer of Canada Postdoctoral Fellowship during these studies. A preliminary report of a portion of this work was communicated to the British Pharmacological Society (Steward et al., 1996).

  • Abbreviations:
    5-HT
    5-hydroxytryptamine
    ACh
    acetylcholine
    nAChR
    nicotinic acetylcholine receptor
    WT
    wild type
    HBSS
    Hanks' buffered salt solution
    mCPBG
    m-chlorophenylbiguanide
    • Received October 5, 1999.
    • Accepted February 24, 2000.
  • The American Society for Pharmacology and Experimental Therapeutics
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Molecular Pharmacology: 57 (6)
Molecular Pharmacology
Vol. 57, Issue 6
1 Jun 2000
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Research ArticleArticle

Importance of Phenylalanine 107 in Agonist Recognition by the 5-Hydroxytryptamine3A Receptor

Lucinda J. Steward, Frank G. Boess, Joy A. Steele, Dan Liu, Norris Wong and Ian L. Martin
Molecular Pharmacology June 1, 2000, 57 (6) 1249-1255;

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Research ArticleArticle

Importance of Phenylalanine 107 in Agonist Recognition by the 5-Hydroxytryptamine3A Receptor

Lucinda J. Steward, Frank G. Boess, Joy A. Steele, Dan Liu, Norris Wong and Ian L. Martin
Molecular Pharmacology June 1, 2000, 57 (6) 1249-1255;
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