7T10

CryoEM structure of somatostatin receptor 2 in complex with somatostatin-14 and Gi3


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Plasticity in ligand recognition at somatostatin receptors.

Robertson, M.J.Meyerowitz, J.G.Panova, O.Borrelli, K.Skiniotis, G.

(2022) Nat Struct Mol Biol 29: 210-217

  • DOI: 10.1038/s41594-022-00727-5
  • Primary Citation of Related Structures:  
    7T10, 7T11

  • PubMed Abstract: 
  • Somatostatin is a signaling peptide that plays a pivotal role in physiologic processes relating to metabolism and growth through its actions at somatostatin receptors (SSTRs). Members of the SSTR subfamily, particularly SSTR2, are key drug targets for neuroendocrine neoplasms, with synthetic peptide agonists currently in clinical use ...

    Somatostatin is a signaling peptide that plays a pivotal role in physiologic processes relating to metabolism and growth through its actions at somatostatin receptors (SSTRs). Members of the SSTR subfamily, particularly SSTR2, are key drug targets for neuroendocrine neoplasms, with synthetic peptide agonists currently in clinical use. Here, we show the cryogenic-electron microscopy structures of active-state SSTR2 in complex with heterotrimeric G i3 and either the endogenous ligand SST14 or the FDA-approved drug octreotide. Complemented by biochemical assays and molecular dynamics simulations, these structures reveal key details of ligand recognition and receptor activation at SSTRs. We find that SSTR ligand recognition is highly diverse, as demonstrated by ligand-induced conformational changes in ECL2 and substantial sequence divergence across subtypes in extracellular regions. Despite this complexity, we rationalize several known sources of SSTR subtype selectivity and identify an additional interaction for specific binding. These results provide valuable insights for structure-based drug discovery at SSTRs.


    Organizational Affiliation

    Department of Structural Biology, Stanford University School of Medicine, Stanford, CA, USA. yiorgo@stanford.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Somatostatin receptor type 2,Kappa-type opioid receptorA [auth R]408Homo sapiensMutation(s): 0 
Gene Names: SSTR2OPRK1OPRK
Membrane Entity: Yes 
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UniProt GroupsP30874P41145
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(i) subunit alpha-3B [auth A]354Homo sapiensMutation(s): 4 
Gene Names: GNAI3
Membrane Entity: Yes 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1C [auth B]344Homo sapiensMutation(s): 0 
Gene Names: GNB1
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2D [auth C]71Homo sapiensMutation(s): 0 
Gene Names: GNG2
Membrane Entity: Yes 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
Somatostatin-14E [auth P]14Homo sapiensMutation(s): 0 
Gene Names: SST
Membrane Entity: Yes 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
scFv16F [auth S]259Mus musculusMutation(s): 0 
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.50 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-09
    Type: Initial release
  • Version 1.1: 2022-03-30
    Changes: Database references