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Researchers Probe Structure of Human Calcium Receptor

Gene expression pattern of the CASR gene.

Michigan State University was part of a team that’s providing new insights into the molecular basis of human diseases resulting from mutations in the calcium-sensing receptor, or CaSR, a protein found in cell membranes.

The team’s findings, published in the current issue of Science Advances, may assist in the development of novel receptor-based therapeutics for mutations that lead to certain types of hypocalcemia and neonatal hyperparathyroidism, in addition to Alzheimer’s disease and some cancers.

Calcium is abundant in the human body and participates in nearly every vital process. CaSR plays a crucial role in maintaining calcium concentration in the human body. However, the molecular basis underlying how CaSR regulates such important cell function has been unclear.

“In this study, we reported the first crystal structure of the extracellular domain of the human CaSR, which enables us to visualize a large number of residues involved in disease-associated mutations,” said Jenny Yang, with Georgia State University and lead author on the paper.

Nearly 200 mutations and 15 polymorphisms associated with a variety of human disorders have been found in CaSR. In this study, researchers were able to map the mutations on the high-resolution CaSR structure. High-resolution structures of the CaSR are essential to gain a better understanding of the underlying mechanism in its regulated physiological functions as well as pathological activities.

The discovery could lead to receptor-based therapeutics for use in the treatment of many different diseases, Yang said.

Jian Hu

Jian Hu

“It is quite interesting that an unexpected small molecule occupies the native ligand binding site and functions as a high-affinity co-activator, which suggests that it may serve as a lead compound for CaSR regulators,” said Jian Hu, coauthor with MSU’s biochemistry and molecular biology department.

The researchers’ discoveries lay the groundwork for the development of agonists and antagonists as potential therapies for human diseases related to the CaSR.

Additional researchers from Georgia State and Brigham and Women’s Hospital contributed to this study, which was supported by the National Institutes of Health and the Georgia Research Alliance.

-Val Osowski, Jian Hu via MSU Today

– Bar chart above: AndrewGNF at English Wikipedia, Gene expression pattern of the CASR gene.

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