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Research ArticleCELLULAR AND MOLECULAR

Domain Swapping in the Human Histamine H1 Receptor

Remko A. Bakker, Guido Dees, Juan J. Carrillo, Raymond G. Booth, Juan F. López-Gimenez, Graeme Milligan, Philip G. Strange and Rob Leurs
Journal of Pharmacology and Experimental Therapeutics October 2004, 311 (1) 131-138; DOI: https://doi.org/10.1124/jpet.104.067041
Remko A. Bakker
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Guido Dees
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Juan J. Carrillo
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Raymond G. Booth
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Juan F. López-Gimenez
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Graeme Milligan
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Philip G. Strange
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Rob Leurs
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Abstract

G-protein-coupled receptors (GPCRs) represent the largest family of receptors involved in transmembrane signaling. Although these receptors were generally believed to be monomeric entities, accumulating evidence supports the presence of GPCRs in multimeric forms. Here, using immunoprecipitation as well as time-resolved fluorescence resonance energy transfer to assess protein-protein interactions in living cells, we unambiguously demonstrate the occurrence of dimerization of the human histamine H1 receptor. We also show the presence of domain-swapped H1 receptor dimers in which there is the reciprocal exchange of transmembrane domain TM domains 6 and 7 between the receptors present in the dimer. Mutation of aspartate107 in transmembrane (TM) 3 or phenylalanine432 in TM6 to alanine results in two radioligand-binding-deficient mutant H1 receptors. Coexpression of H1D107 A and H1F432A, however, results in a reconstituted radioligand binding site that exhibits a pharmacological profile that corresponds to the wild-type H1 receptor. Interestingly, the H1 receptor radioligands [3H]mepyramine and [3H]-(–)-trans-1-phenyl-3-N,N-dimethylamino-1,2,3,4-tetrahydronaphthalene show differential saturation binding values (Bmax) for wild-type H1 receptors but not for the radioligand binding site that is formed upon coexpression of H1 D107A and H1 F432A receptors, suggesting the presence of different H1 receptor populations.

Footnotes

  • This study was supported in part by UCB Pharma (Brussels, Belgium) and by the European Union BIOMED 2 program “Inverse Agonism. Implications for Drug Research” (to R.A.B., G.D., and R.L.).

  • This work was presented at the XXXIII Annual Meeting of the European Histamine Research Society which was held from April 28 to May 2, 2004, Düsseldorf/Köln, Germany.

  • doi:10.1124/jpet.104.067041.

  • ABBREVIATIONS: GPCR, G-protein-coupled receptor; H1R, human histamine H1 receptor; FRET, fluorescence resonance energy transfer; [3H]-(–)-trans-H2-PAT, [3H]-(–)-trans-1-phenyl-3-N,N-dimethylamino-1,2,3,4-tetrahydronaphthalene; PAGE, polyacrylamide gel electrophoresis; nH, Hill coefficient; tr, time resolved; TM, transmembrane.

  • ↵1 These authors contributed equally to this article.

    • Received February 24, 2004.
    • Accepted May 24, 2004.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 311 (1)
Journal of Pharmacology and Experimental Therapeutics
Vol. 311, Issue 1
1 Oct 2004
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Research ArticleCELLULAR AND MOLECULAR

Domain Swapping in the Human Histamine H1 Receptor

Remko A. Bakker, Guido Dees, Juan J. Carrillo, Raymond G. Booth, Juan F. López-Gimenez, Graeme Milligan, Philip G. Strange and Rob Leurs
Journal of Pharmacology and Experimental Therapeutics October 1, 2004, 311 (1) 131-138; DOI: https://doi.org/10.1124/jpet.104.067041

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Research ArticleCELLULAR AND MOLECULAR

Domain Swapping in the Human Histamine H1 Receptor

Remko A. Bakker, Guido Dees, Juan J. Carrillo, Raymond G. Booth, Juan F. López-Gimenez, Graeme Milligan, Philip G. Strange and Rob Leurs
Journal of Pharmacology and Experimental Therapeutics October 1, 2004, 311 (1) 131-138; DOI: https://doi.org/10.1124/jpet.104.067041
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