Abstract
MAINTENANCE of a stable internal environment within complex organisms requires specialized cells that sense changes in the extracellular concentration of specific ions (such as Ca2+). Although the molecular nature of such ion sensors is unknown, parathyroid cells possess a cell surface Ca2+-sensing mechanism that also rec-ognizes trivalent and polyvalent cations (such as neomycin) and couples by changes in phosphoinositide turnover and cytosolic Ca2+ to regulation of parathyroid hormone secretion1–4. The latter restores normocalcaemia by acting on kidney and bone2. We now report the cloning of complementary DNA encoding an extracellular Ca2+ -sensing receptor from bovine parathyroid with pharmacological and functional properties nearly identical to those of the native receptor. The novel ∼120K receptor shares limited similarity with the metabotropic glutamate receptors5 and features a large extracellular domain, containing clusters of acidic aminoacid residues possibly involved in calcium binding, coupled to a seven-membrane-spanning domain like those in the G-protein-coupled receptor superfamily.
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Brown, E., Gamba, G., Riccardi, D. et al. Cloning and characterization of an extracellular Ca2+-sensing receptor from bovine parathyroid. Nature 366, 575–580 (1993). https://doi.org/10.1038/366575a0
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DOI: https://doi.org/10.1038/366575a0
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