Ligand binding pocket formed by evolutionarily conserved residues in the glucagon-like peptide-1 (GLP-1) receptor core domain

Mi Jin Moon, Yoo Na Lee, Sumi Park, Arfaxad Reyes-Alcaraz, Jong-Ik Hwang, Robert Peter Millar, Han Choe, Jae Young Seong

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)5696-5706
Number of pages11
JournalJournal of Biological Chemistry
Volume290
Issue number9
DOIs
Publication statusPublished - 2015 Feb 27

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Glucagon-Like Peptide 1
Ligands
Molecular modeling
Medical problems
Type 2 Diabetes Mellitus
Homeostasis
Obesity
Chemical activation
Glucagon-Like Peptide-1 Receptor
Amino Acids
Glucose
Peptides

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Ligand binding pocket formed by evolutionarily conserved residues in the glucagon-like peptide-1 (GLP-1) receptor core domain. / Moon, Mi Jin; Lee, Yoo Na; Park, Sumi; Reyes-Alcaraz, Arfaxad; Hwang, Jong-Ik; Millar, Robert Peter; Choe, Han; Seong, Jae Young.

In: Journal of Biological Chemistry, Vol. 290, No. 9, 27.02.2015, p. 5696-5706.

Research output: Contribution to journalArticle

Moon, Mi Jin ; Lee, Yoo Na ; Park, Sumi ; Reyes-Alcaraz, Arfaxad ; Hwang, Jong-Ik ; Millar, Robert Peter ; Choe, Han ; Seong, Jae Young. / Ligand binding pocket formed by evolutionarily conserved residues in the glucagon-like peptide-1 (GLP-1) receptor core domain. In: Journal of Biological Chemistry. 2015 ; Vol. 290, No. 9. pp. 5696-5706.
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