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Updated: Aug 14, 2026

Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study
Published on: July 27, 2016
MC4R oligomerizes independently of extracellular cysteine residues
Andrea Elsner1, Patrick Tarnow, Michael Schaefer
1Otto Heubner Centrum für Kinderheilkunde und Jugendmedizin, Pädiatrische Endokrinologie, Campus Virchow-Klinikum, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
Abstract:
The melanocortin 4 receptor (MC4R) plays an essential role in weight regulation. Recently we could show that the MC4R is able to form receptor dimers. In the present study we investigated the role of extracellular cysteine residues and the structure of the third extracellular loop for receptor dimerization. None of the four extracellular cysteine residues nor the structure of the third extracellular loop play a role for MC4R-MC4R interaction as all investigated mutants display the same dimerization pattern as the wild-type receptor. Therefore for MC4R dimerization structures of the transmembrane-spanning helices are more likely to be involved.
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