Covalent drug discovery targeting G protein-coupled receptors

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  • Kondo Moe
    Department of Physiology, Graduate School of Pharmaceutical Sciences Kyushu University Department of Medicine and Biosystemic Science, Kyushu University Graduate School of Medical Sciences
  • Nishiyama Kazuhiro
    Department of Physiology, Graduate School of Pharmaceutical Sciences Kyushu University
  • Nishimura Akiyuki
    Division of Cardiocirculatory Signaling, National Institute for Physiological Sciences (Exploratory Research Center on Life and Living Systems), National Institutes of Natural Sciences
  • Kato Yuri
    Department of Physiology, Graduate School of Pharmaceutical Sciences Kyushu University
  • Nishida Motohiro
    Department of Physiology, Graduate School of Pharmaceutical Sciences Kyushu University Division of Cardiocirculatory Signaling, National Institute for Physiological Sciences (Exploratory Research Center on Life and Living Systems), National Institutes of Natural Sciences

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  • Gタンパク質共役型受容体を標的としたコバレント創薬
  • Gタンパクシツ キョウヤクガタ ジュヨウタイ オ ヒョウテキ ト シタ コバレントソウヤク

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<p>G protein-coupled receptors (GPCRs) play pivotal roles in converting physicochemical stimuli due to environmental changes to intracellular responses. After ligand stimulation, many GPCRs are desensitized and then recycled or degraded through phosphorylation and β-arrestin-dependent internalization, an important process to maintain protein quality control of GPCRs. However, it is unknown how GPCRs with low β-arrestin sensitivity are controlled. Here we unmasked a β-arrestin-independent GPCR internalization, named Redox-dependent Alternative Internalization (REDAI), focusing on β-arrestin-resistant purinergic P2Y6 receptor (P2Y6R). P2Y6R is highly expressed in macrophage and pathologically contributes to the development of colitis in mice. Natural electrophiles including in functional foods induce REDAI-mediated P2Y6R degradation leading to anti-inflammation in macrophages. Prevention of Cys220 modification on P2Y6R resulted in aggravation of the colitis. These results strongly suggest that targeting REDAI on GPCRs will be a breakthrough strategy for the prevention and treatment of inflammatory diseases.</p>

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