Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 5-mer - A1B1C1D1E1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 159.74 kDa 
• Atom Count: 8137 
• Modelled Residue Count: 1068 
• Deposited Residue Count: 1443 
• Unique protein chains: 5

7XMT

CryoEM structure of somatostatin receptor 4 (SSTR4) with Gi1 and J-2156

• PDB DOI: 10.2210/pdb7XMT/pdb
• EM Map EMD-33304: EMDB EMDataResource

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens, Mus musculus
• Expression System: Insecta environmental sample
• Mutation(s): Yes 
• Membrane Protein: Yes  PDBTM


• Deposited: 2022-04-26 Released: 2022-08-03 
• Deposition Author(s): Wenli, Z., Shuo, H., Na, Q., Wenbo, Z., Mengjie, L., Dehua, Y., Ming-Wei, W., Wu, B., Zhao, Q.
• Funding Organization(s): National Science Foundation (NSF, China)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 2.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

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 

• PubMed: 35739238 
• DOI: 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.

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Organizational Affiliation: 

Zhongshan Institute of Drug Discovery, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Zhongshan, Guangdong, China. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Somatostatin receptor type 4	A [auth R]	375	Homo sapiens	Mutation(s): 0  Gene Names: SSTR4 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P31391 (Homo sapiens) Explore P31391  Go to UniProtKB:  P31391
PHAROS:  P31391

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(i) subunit alpha-1	B [auth A]	354	Homo sapiens	Mutation(s): 5  Gene Names: GNAI1 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P63096 (Homo sapiens) Explore P63096  Go to UniProtKB:  P63096
PHAROS:  P63096

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
single chain variable fragment of antibody	C [auth S]	292	Mus musculus	Mutation(s): 0

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	D [auth C]	71	Homo sapiens	Mutation(s): 0  Gene Names: GNG2 Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P59768 (Homo sapiens) Explore P59768  Go to UniProtKB:  P59768
PHAROS:  P59768

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	E [auth B]	351	Homo sapiens	Mutation(s): 0  Gene Names: GNB1
UniProt & NIH Common Fund Data Resources
Find proteins for P62873 (Homo sapiens) Explore P62873  Go to UniProtKB:  P62873
PHAROS:  P62873

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
I8B (Subject of Investigation/LOI)	F [auth R]	(2~{S})-2-[[(2~{S})-4-azanyl-2-[(4-methylnaphthalen-1-yl)sulfonylamino]butanoyl]amino]-3-phenyl-propanimidic acid C24 H28 N4 O4 S VTNCZBXJSGKDLS-SFTDATJTSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.80 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2022-04-26 
• Released Date: 2022-08-03 
Deposition Author(s): Wenli, Z., Shuo, H., Na, Q., Wenbo, Z., Mengjie, L., Dehua, Y., Ming-Wei, W., Wu, B., Zhao, Q.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, China)	China	32161133011
National Science Foundation (NSF, China)	China	31825010
National Science Foundation (NSF, China)	China	82121005
National Science Foundation (NSF, China)	China	81872915
National Science Foundation (NSF, China)	China	82073904
National Science Foundation (NSF, China)	China	81773792
National Science Foundation (NSF, China)	China	81973373
National Science Foundation (NSF, China)	China	21704064

Revision History  

• Version 1.0: 2022-08-03
  Type: Initial release