TY - JOUR
T1 - Ligand binding pocket formed by evolutionarily conserved residues in the glucagon-like peptide-1 (GLP-1) receptor core domain
AU - Moon, Mi Jin
AU - Lee, Yoo Na
AU - Park, Sumi
AU - Reyes-Alcaraz, Arfaxad
AU - Hwang, Jong Ik
AU - Millar, Robert Peter
AU - Choe, Han
AU - Seong, Jae Young
N1 - Publisher Copyright:
© 2015 by The American Society for Biochemistry and Molecular Biology, Inc.
PY - 2015/2/27
Y1 - 2015/2/27
N2 - Glucagon-like peptide-1 (GLP-1) plays a pivotal role in glucose homeostasis through its receptor GLP1R. Due to its multiple beneficial effects, GLP-1 has gained great attention for treatment of type 2 diabetes and obesity. However, little is known about the molecular mechanism underlying the interaction of GLP-1 with the heptahelical core domain of GLP1R conferring high affinity ligand binding and ligand-induced receptor activation. Here, using chimeric and point-mutated GLP1R, we determined that the evolutionarily conserved amino acid residue Arg380 flanked by hydrophobic Leu379 and Phe381 in extracellular loop 3 (ECL3) may have an interaction with Asp9 and Gly4 of the GLP-1 peptide. The molecular modeling study showed that Ile196 at transmembrane helix 2, Met233 at ECL1, and Asn302 at ECL2 of GLP1R have contacts with His1 and Thr7 of GLP-1. This study may shed light on the mechanism underlying high affinity interaction between the ligand and the binding pocket that is formed by these conserved residues in the GLP1R core domain.
AB - Glucagon-like peptide-1 (GLP-1) plays a pivotal role in glucose homeostasis through its receptor GLP1R. Due to its multiple beneficial effects, GLP-1 has gained great attention for treatment of type 2 diabetes and obesity. However, little is known about the molecular mechanism underlying the interaction of GLP-1 with the heptahelical core domain of GLP1R conferring high affinity ligand binding and ligand-induced receptor activation. Here, using chimeric and point-mutated GLP1R, we determined that the evolutionarily conserved amino acid residue Arg380 flanked by hydrophobic Leu379 and Phe381 in extracellular loop 3 (ECL3) may have an interaction with Asp9 and Gly4 of the GLP-1 peptide. The molecular modeling study showed that Ile196 at transmembrane helix 2, Met233 at ECL1, and Asn302 at ECL2 of GLP1R have contacts with His1 and Thr7 of GLP-1. This study may shed light on the mechanism underlying high affinity interaction between the ligand and the binding pocket that is formed by these conserved residues in the GLP1R core domain.
UR - http://www.scopus.com/inward/record.url?scp=84923767681&partnerID=8YFLogxK
U2 - 10.1074/jbc.M114.612606
DO - 10.1074/jbc.M114.612606
M3 - Article
C2 - 25561730
AN - SCOPUS:84923767681
SN - 0021-9258
VL - 290
SP - 5696
EP - 5706
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 9
ER -
