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-Structure paper
タイトル | Molecular basis for the selective G protein signaling of somatostatin receptors. |
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ジャーナル・号・ページ | Nat Chem Biol, Vol. 19, Issue 2, Page 133-140, Year 2023 |
掲載日 | 2022年9月22日 |
著者 | Sijia Chen / Xiao Teng / Sanduo Zheng / |
PubMed 要旨 | G protein-coupled receptors (GPCRs) modulate every aspect of physiological functions mainly through activating heterotrimeric G proteins. A majority of GPCRs promiscuously couple to multiple G ...G protein-coupled receptors (GPCRs) modulate every aspect of physiological functions mainly through activating heterotrimeric G proteins. A majority of GPCRs promiscuously couple to multiple G protein subtypes. Here we validate that in addition to the well-known G pathway, somatostatin receptor 2 and 5 (SSTR2 and SSTR5) couple to the G pathway and show that smaller ligands preferentially activate the G pathway. We further determined cryo-electron microscopy structures of the SSTR2‒G and SSTR2‒G complexes bound to octreotide and SST-14. Structural and functional analysis revealed that G protein selectivity of SSTRs is not only determined by structural elements in the receptor-G protein interface, but also by the conformation of the agonist-binding pocket. Accordingly, smaller ligands fail to stabilize a broader agonist-binding pocket of SSTRs that is required for efficient G coupling but not G coupling. Our studies facilitate the design of drugs with selective G protein signaling to improve therapeutic efficacy. |
リンク | Nat Chem Biol / PubMed:36138141 |
手法 | EM (単粒子) |
解像度 | 3.25 - 3.48 Å |
構造データ | EMDB-33585, PDB-7y24: EMDB-33586, PDB-7y26: EMDB-33587, PDB-7y27: |
化合物 | ChemComp-CLR: |
由来 |
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キーワード | STRUCTURAL PROTEIN / GPCR / somatostatin receptor / G protein / biased ligand |