2. Academic Validation
  3. Crystal structure of the human angiotensin II type 2 receptor bound to an angiotensin II analog

Crystal structure of the human angiotensin II type 2 receptor bound to an angiotensin II analog

  • Nat Struct Mol Biol. 2018 Jul;25(7):570-576. doi: 10.1038/s41594-018-0079-8.
Hidetsugu Asada 1,  Shoichiro Horita 1,  Kunio Hirata 2 3,  Mitsunori Shiroishi 4,  Yuki Shiimura 5,  Hiroko Iwanari 6,  Takao Hamakubo 6,  Tatsuro Shimamura 1,  Norimichi Nomura 1,  Osamu Kusano-Arai 6,  Tomoko Uemura 1,  Chiyo Suno 1,  Takuya Kobayashi 1 7,  So Iwata 8 9
Affiliations

Affiliations

  • 1 Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
  • 2 RIKEN, SPring-8 Center, Hyogo, Japan.
  • 3 Japan Science and Technology Agency (JST), Precursory Research for Embryonic Science and Technology (PRESTO), Saitama, Japan.
  • 4 Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan.
  • 5 Molecular Genetics, Institute of Life Science, Kurume University, Fukuoka, Japan.
  • 6 Department of Quantitative Biology and Medicine, Research Center for Advanced Science and Technology, University of Tokyo, Tokyo, Japan.
  • 7 Japan Agency for Medical Research and Development (AMED), Core Research for Evolutional Science and Technology (CREST), Kyoto, Japan.
  • 8 Department of Cell Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan. s.iwata@mfour.med.kyoto-u.ac.jp.
  • 9 RIKEN, SPring-8 Center, Hyogo, Japan. s.iwata@mfour.med.kyoto-u.ac.jp.
PMID: 29967536 DOI: 10.1038/s41594-018-0079-8
Abstract

Angiotensin II (AngII) plays a central role in regulating human blood pressure, which is mainly mediated by interactions between AngII and the G-protein-coupled receptors (GPCRs) AngII type 1 receptor (AT1R) and AngII type 2 receptor (AT2R). We have solved the crystal structure of human AT2R binding the peptide ligand [Sar1, Ile8]AngII and its specific antibody at 3.2-Å resolution. [Sar1, Ile8]AngII interacts with both the 'core' binding domain, where the small-molecule ligands of AT1R and AT2R bind, and the 'extended' binding domain, which is equivalent to the allosteric modulator binding site of Muscarinic Acetylcholine Receptor. We generated an antibody fragment to stabilize the extended binding domain that functions as a positive allosteric modulator. We also identified a signature positively charged cluster, which is conserved among peptide-binding receptors, to locate C termini at the bottom of the binding pocket. The reported results should help with designing ligands for angiotensin receptors and possibly to Other peptide GPCRs.

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