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Naturally occurring mutations of the extracellular Ca2+-sensing receptor: implications for its structure and function
1Molecular Pathophysiology Section, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD 20892, USA. jianxinh@intra.niddk.nih.gov
Trends in Endocrinology and Metabolism: TEM
|August 2, 2003
Summary
The Ca2+-sensing receptor, a G-protein-coupled receptor, activates via its Venus-flytrap domain. Insights from related structures and genetic mutations illuminate its activation mechanism and allosteric modulation.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- The Ca2+-sensing receptor (CaSR) is a G-protein-coupled receptor (GPCR) crucial for calcium homeostasis.
- Agonists bind to the dimeric Venus-flytrap (VFT) domain of CaSR, but the mechanism of signal transduction to the seven-transmembrane (7TM) domain remains unclear.
Purpose of the Study:
- To elucidate the activation mechanism of the Ca2+-sensing receptor.
- To understand how agonist binding to the VFT domain triggers signaling through the 7TM domain.
- To gain insights into the action of allosteric modulators on CaSR.
Main Methods:
- Comparative structural analysis of the CaSR VFT domain with related receptors (e.g., metabotropic glutamate receptor 1).
- Investigation of naturally occurring mutations in CaSR associated with human genetic disorders.
Main Results:
- Structural information from related VFT domains provides a model for CaSR ligand binding.
- Analysis of familial hypocalciuric hypercalcemia and autosomal dominant hypocalcemia mutations reveals key residues involved in CaSR activation.
Conclusions:
- The study offers novel insights into the allosteric activation mechanism of the Ca2+-sensing receptor.
- Understanding CaSR activation is critical for developing therapeutics targeting calcium-related disorders.