Abstract
G-PROTEIN-COUPLED receptors for catecholamines and some other small ligands are activated when agonists bind to the transmem-brane region of the receptor1. The docking interactions through which peptide agonists activate their receptors are less well characterized2–7. The thrombin receptor is a specialized peptide receptor. It is activated by binding its tethered ligand domain, which is unmasked upon receptor cleavage by thrombin8,9. Human and Xenopus thrombin receptor homologues are each selectively activated by the agonist peptide representing their respective tethered ligand domains. Here we identify receptor domains that confer this agonist specificity by replacing the Xenopus receptor's amino-terminal exodomain and three extracellular loops with the corresponding human structures. This switches receptor specificity from Xenopus to human. The specificity of these thrombin receptors for their respective peptide agonists is thus determined by their extracellular surfaces. Our results indicate that agonist interaction with extracellular domains is important for thrombin receptor activation.
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Gerszten, R., Chen, J., Ishli, M. et al. Specificity of the thrombin receptor for agonist peptide is defined by its extracellular surface. Nature 368, 648–651 (1994). https://doi.org/10.1038/368648a0
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DOI: https://doi.org/10.1038/368648a0
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