Vibrational spectroscopy analysis of ligand efficacy in human M₂ muscarinic acetylcholine receptor (M₂R)

  • Katayama, Kota
    Department of Life Science and Applied Chemistry, Nagoya Institute of Technology; OptoBioTechnology Research Center, Nagoya Institute of Technology; PRESTO, Japan Science and Technology Agency
  • Suzuki, Kohei
    Department of Life Science and Applied Chemistry, Nagoya Institute of Technology
  • Suno, Ryoji
    Department of Medical Chemistry, Kansai Medical University
  • Kise, Ryoji
    Graduate School of Pharmaceutical Sciences, Tohoku University
  • Tsujimoto, Hirokazu
    Department of Cell Biology and Medical Chemistry, Graduate School of Medicine, Kyoto University
  • Iwata, So
    Department of Cell Biology and Medical Chemistry, Graduate School of Medicine, Kyoto University
  • Inoue, Asuka
    Graduate School of Pharmaceutical Sciences, Tohoku University
  • Kobayashi, Takuya
    Department of Medical Chemistry, Kansai Medical University; Japan Agency for Medical Research and Development, Core Research for Evolutional Science and Technology (AMED-CREST)
  • Kandori, Hideki
    Department of Life Science and Applied Chemistry, Nagoya Institute of Technology; OptoBioTechnology Research Center, Nagoya Institute of Technology

Description

The intrinsic efficacy of ligand binding to G protein-coupled receptors (GPCRs) reflects the ability of the ligand to differentially activate its receptor to cause a physiological effect. Here we use attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy to examine the ligand-dependent conformational changes in the human M₂ muscarinic acetylcholine receptor (M₂R)). We show that different ligands affect conformational alteration appearing at the C=O stretch of amide-I band in M2R. Notably, ATR-FTIR signals strongly correlated with G-protein activation levels in cells. Together, we propose that amide-I band serves as an infrared probe to distinguish the ligand efficacy in M₂R) and paves the path to rationally design ligands with varied efficacy towards the target GPCR.

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