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Cloning and characterization of an extracellular Ca2+-sensing receptor from bovine parathyroid

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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