7XAT

Structure of somatostatin receptor 2 bound with SST14.

7XAT の概要

• エントリーDOI: 10.2210/pdb7xat/pdb
• EMDBエントリー: 33098
• 関連するBIRD辞書のPRD_ID: PRD_001216
• 分子名称: Somatostatin receptor type 2,LargeBit, Guanine nucleotide-binding protein G(i) subunit alpha-1, Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1, ... (6 entities in total)
• 機能のキーワード: g protein coupled receptor, cryo-em, sst analogues, polypeptide drugs, membrane protein
• 由来する生物種: Homo sapiens (human); 詳細
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 184993.59

構造登録者

Bo, Q.,Yang, F.,Li, Y.G.,Meng, X.Y.,Zhang, H.H.,Zhou, Y.X.,Ling, S.L.,Sun, D.M.,Lv, P.,Liu, L.,Shi, P.,Tian, C.L. (登録日: 2022-03-19, 公開日: 2022-08-31, 最終更新日: 2024-11-20)

主引用文献

Bo, Q.,Yang, F.,Li, Y.,Meng, X.,Zhang, H.,Zhou, Y.,Ling, S.,Sun, D.,Lv, P.,Liu, L.,Shi, P.,Tian, C.
Structural insights into the activation of somatostatin receptor 2 by cyclic SST analogues.
Cell Discov, 8:47-47, 2022

PubMed Abstract: The endogenous cyclic tetradecapeptide SST14 was reported to stimulate all five somatostatin receptors (SSTR1-5) for hormone release, neurotransmission, cell growth arrest and cancer suppression. Two SST14-derived short cyclic SST analogues (lanreotide or octreotide) with improved stability and longer lifetime were developed as drugs to preferentially activate SSTR2 and treat acromegalia and neuroendocrine tumors. Here, cryo-EM structures of the human SSTR2-Gi complex bound with SST14, octreotide or lanreotide were determined at resolutions of 2.85 Å, 2.97 Å, and 2.87 Å, respectively. Structural and functional analysis revealed that interactions between β-turn residues in SST analogues and transmembrane SSTR2 residues in the ligand-binding pocket are crucial for receptor binding and functional stimulation of the two SST14-derived cyclic octapeptides. Additionally, Q102, N276, and F294 could be responsible for the selectivity of lanreotide or octreotide for SSTR2 over SSTR1 or SSTR4. These results provide valuable insights into further rational development of SST analogue drugs targeting SSTR2.

PubMed: 35595746
DOI: 10.1038/s41421-022-00405-2

実験手法

ELECTRON MICROSCOPY (2.85 Å)