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Title: Structural basis for regulation of human calcium-sensing receptor by magnesium ions and an unexpected tryptophan derivative co-agonist

Journal Article · · Science Advances

Ca2+-sensing receptors (CaSRs) modulate calcium and magnesium homeostasis and many (patho)physiological processes by responding to extracellular stimuli, including divalent cations and amino acids. We report the first crystal structure of the extracellular domain (ECD) of human CaSR bound with Mg2+and a tryptophan derivative ligand at 2.1 Å. The structure reveals key determinants for cooperative activation by metal ions and aromatic amino acids. The unexpected tryptophan derivative was bound in the hinge region between two globular ECD subdomains, and represents a novel high-affinity co-agonist of CaSR. The dissection of structure-function relations by mutagenesis, biochemical, and functional studies provides insights into the molecular basis of human diseases arising from CaSR mutations. The data also provide a novel paradigm for understanding the mechanism of CaSR-mediated signaling that is likely shared by the other family C GPCR [G protein (heterotrimeric guanine nucleotide–binding protein)–coupled receptor] members and can facilitate the development of novel CaSR-based therapeutics.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Institutes of Health (NIH); Georgia Research Alliance
Grant/Contract Number:
GM081749; EB007268; GM115373
OSTI ID:
1256347
Journal Information:
Science Advances, Vol. 2, Issue 5; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 81 works
Citation information provided by
Web of Science

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Cited By (21)

Structural architecture of a dimeric class C GPCR based on co-trafficking of sweet taste receptor subunits journal February 2019
Calcium-sensing receptor residues with loss- and gain-of-function mutations are located in regions of conformational change and cause signalling bias journal July 2018
Recent advances in understanding the extracellular calcium-sensing receptor journal October 2016
Homozygous Calcium-Sensing Receptor Polymorphism R544Q Presents as Hypocalcemic Hypoparathyroidism journal May 2018
Magnesium Replacement to Protect Cardiovascular and Kidney Damage? Lack of Prospective Clinical Trials journal February 2018
Disorders of the calcium-sensing receptor and partner proteins: insights into the molecular basis of calcium homeostasis journal October 2016
Phosphate acts directly on the calcium-sensing receptor to stimulate parathyroid hormone secretion journal October 2019
PredCSO: an ensemble method for the prediction of S-sulfenylation sites in proteins journal January 2018
Identification of Serine-875 as an Inhibitory Phosphorylation Site in the Calcium-Sensing Receptor journal June 2019
Calcium-Sensing Receptor Internalization Is β -Arrestin–Dependent and Modulated by Allosteric Ligands journal August 2019
Structural insights into G-protein-coupled receptor allostery journal July 2018
The Calcium-Sensing Receptor and the Parathyroid: Past, Present, Future journal December 2016
Editorial: Physiology and Pathophysiology of the Extracellular Calcium-Sensing Receptor journal May 2018
The Nervous System Relevance of the Calcium Sensing Receptor in Health and Disease journal July 2019
The CaSR in Pathogenesis of Breast Cancer: A New Target for Early Stage Bone Metastases journal February 2020
Molecular Basis for Modulation of Metabotropic Glutamate Receptors and Their Drug Actions by Extracellular Ca2+ journal March 2017
Structural basis for perception of diverse chemical substances by T1r taste receptors journal May 2017
Expression system for structural and functional studies of human glycosylation enzymes journal December 2017
Investigating the molecular mechanism of positive and negative allosteric modulators in the calcium-sensing receptor dimer journal April 2017
Renal Ca2+ and Water Handling in Response to Calcium Sensing Receptor Signaling: Physiopathological Aspects and Role of CaSR-Regulated microRNAs journal October 2019
Microporous polysaccharide multilayer coated BCP composite scaffolds with immobilised calcitriol promote osteoporotic bone regeneration both in vitro and in vivo journal January 2019

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