Crystal structure of somatostatin receptor 2 (SSTR2) with peptide antagonist CYN 154806

Experimental Data Snapshot

  • Resolution: 2.65 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.220 

Starting Models: experimental
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wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Structural insights into ligand recognition and selectivity of somatostatin receptors.

Zhao, W.Han, S.Qiu, N.Feng, W.Lu, M.Zhang, W.Wang, M.Zhou, Q.Chen, S.Xu, W.Du, J.Chu, X.Yi, C.Dai, A.Hu, L.Shen, M.Y.Sun, Y.Zhang, Q.Ma, Y.Zhong, W.Yang, D.Wang, M.W.Wu, B.Zhao, Q.

(2022) Cell Res 32: 761-772

  • DOI: https://doi.org/10.1038/s41422-022-00679-x
  • Primary Citation of Related Structures:  
    7XMR, 7XMS, 7XMT, 7XN9, 7XNA

  • PubMed Abstract: 

    Somatostatin receptors (SSTRs) play versatile roles in inhibiting the secretion of multiple hormones such as growth hormone and thyroid-stimulating hormone, and thus are considered as targets for treating multiple tumors. Despite great progress made in therapeutic development against this diverse receptor family, drugs that target SSTRs still show limited efficacy with preferential binding affinity and conspicuous side-effects. Here, we report five structures of SSTR2 and SSTR4 in different states, including two crystal structures of SSTR2 in complex with a selective peptide antagonist and a non-peptide agonist, respectively, a cryo-electron microscopy (cryo-EM) structure of G i1 -bound SSTR2 in the presence of the endogenous ligand SST-14, as well as two cryo-EM structures of G i1 -bound SSTR4 in complex with SST-14 and a small-molecule agonist J-2156, respectively. By comparison of the SSTR structures in different states, molecular mechanisms of agonism and antagonism were illustrated. Together with computational and functional analyses, the key determinants responsible for ligand recognition and selectivity of different SSTR subtypes and multiform binding modes of peptide and non-peptide ligands were identified. Insights gained in this study will help uncover ligand selectivity of various SSTRs and accelerate the development of new molecules with better efficacy by targeting SSTRs.

  • Organizational Affiliation

    State Key Laboratory of Drug Research and CAS Key Laboratory of Receptor Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Somatostatin receptor type 2,Endo-1,4-beta-xylanase583Homo sapiensNiallia circulansMutation(s): 0 
Gene Names: SSTR2xlnA
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P30874 (Homo sapiens)
Explore P30874 
Go to UniProtKB:  P30874
GTEx:  ENSG00000180616 
Find proteins for P09850 (Niallia circulans)
Explore P09850 
Go to UniProtKB:  P09850
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP30874P09850
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CYN 15480610synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on PPN
Experimental Data & Validation

Experimental Data

  • Resolution: 2.65 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.15α = 90
b = 85.21β = 90
c = 163.69γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China32161133011
National Science Foundation (NSF, China)China31825010
National Science Foundation (NSF, China)China82121005
National Science Foundation (NSF, China)China81872915
National Science Foundation (NSF, China)China82073904
National Science Foundation (NSF, China)China81773792
National Science Foundation (NSF, China)China81973373
National Science Foundation (NSF, China)China21704064

Revision History  (Full details and data files)

  • Version 1.0: 2022-08-03
    Type: Initial release
  • Version 1.1: 2022-08-17
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Data collection, Refinement description