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N ‐glycosylation and disulfide bonding affects GPRC6A receptor expression, function, and dimerization
Author(s) -
Nørskov-Lauritsen Lenea,
Jørgensen Stine,
Bräuner-Osborne Hans
Publication year - 2015
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2015.01.019
Subject(s) - receptor , glycosylation , biochemistry , extracellular , function (biology) , disulfide linkage , chemistry , cysteine , g protein coupled receptor , 5 ht5a receptor , microbiology and biotechnology , biology , enzyme
Investigation of post‐translational modifications of receptor proteins is important for our understanding of receptor pharmacology and disease physiology. However, our knowledge about post‐translational modifications of class C G protein‐coupled receptors and how these modifications regulate expression and function is very limited. Herein, we show that the nutrient‐sensing class C G protein‐coupled receptor GPRC6A carries seven N ‐glycans and that one of these sites modulates surface expression whereas mutation of another site affects receptor function. GPRC6A has been speculated to form covalently linked dimers through cysteine disulfide linkage in the extracellular amino‐terminal domain and here we show that GPRC6A indeed is a homodimer and that a disulfide bridge between the C131 residues is formed.