MC4R oligomerizes independently of extracellular cysteine residues.
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.
Elsner
Andrea
A
Otto Heubner Centrum für Kinderheilkunde und Jugendmedizin, Pädiatrische Endokrinologie, Campus Virchow-Klinikum, Charité-Universitätsmedizin Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
Tarnow
Patrick
P
Schaefer
Michael
M
Ambrugger
Petra
P
Krude
Heiko
H
Grüters
Annette
A
Biebermann
Heike
H
D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D002460:Cell Line; D002478:Cells, Cultured; D003545:Cysteine / Q000235:genetics; D019281:Dimerization; D005110:Extracellular Space / Q000378:metabolism; D006801:Humans; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D044105:Receptor, Melanocortin, Type 4 / Q000737:chemistry* / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction / Q000502:physiology
D044105:Receptor, Melanocortin, Type 4; D003545:Cysteine