+Open data
-Basic information
Entry | Database: PDB / ID: 7xn9 | |||||||||||||||||||||||||||
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Title | Crystal structure of SSTR2 and L-054,522 complex | |||||||||||||||||||||||||||
Components | Somatostatin receptor type 2,Endo-1,4-beta-xylanase | |||||||||||||||||||||||||||
Keywords | SIGNARING PROTEIN/INHIBITOR / G protein-coupled receptor / somatostatin receptor 2 / STRUCTURAL PROTEIN / SIGNALING PROTEIN / SIGNARING PROTEIN-INHIBITOR complex | |||||||||||||||||||||||||||
Function / homology | Function and homology information somatostatin receptor activity / peristalsis / neuropeptide binding / cellular response to glucocorticoid stimulus / endo-1,4-beta-xylanase activity / endo-1,4-beta-xylanase / response to starvation / xylan catabolic process / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway ...somatostatin receptor activity / peristalsis / neuropeptide binding / cellular response to glucocorticoid stimulus / endo-1,4-beta-xylanase activity / endo-1,4-beta-xylanase / response to starvation / xylan catabolic process / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / forebrain development / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / cerebellum development / Peptide ligand-binding receptors / cellular response to estradiol stimulus / PDZ domain binding / G alpha (i) signalling events / spermatogenesis / neuron projection / negative regulation of cell population proliferation / plasma membrane / cytosol Similarity search - Function | |||||||||||||||||||||||||||
Biological species | Homo sapiens (human) Niallia circulans (bacteria) | |||||||||||||||||||||||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.6 Å | |||||||||||||||||||||||||||
Authors | Zhao, W. / Han, S. / Qiu, N. / Feng, W. / Lu, M. / Yang, D. / Wang, M.-W. / Wu, B. / Zhao, Q. | |||||||||||||||||||||||||||
Funding support | China, 8items
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Citation | Journal: Cell Res / Year: 2022 Title: Structural insights into ligand recognition and selectivity of somatostatin receptors. Authors: Wenli Zhao / Shuo Han / Na Qiu / Wenbo Feng / Mengjie Lu / Wenru Zhang / Mu Wang / Qingtong Zhou / Shutian Chen / Wei Xu / Juan Du / Xiaojing Chu / Cuiying Yi / Antao Dai / Liaoyuan Hu / ...Authors: Wenli Zhao / Shuo Han / Na Qiu / Wenbo Feng / Mengjie Lu / Wenru Zhang / Mu Wang / Qingtong Zhou / Shutian Chen / Wei Xu / Juan Du / Xiaojing Chu / Cuiying Yi / Antao Dai / Liaoyuan Hu / Michelle Y Shen / Yaping Sun / Qing Zhang / Yingli Ma / Wenge Zhong / Dehua Yang / Ming-Wei Wang / Beili Wu / Qiang Zhao / 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 ...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-bound SSTR2 in the presence of the endogenous ligand SST-14, as well as two cryo-EM structures of G-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. | |||||||||||||||||||||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 7xn9.cif.gz | 232 KB | Display | PDBx/mmCIF format |
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PDB format | pdb7xn9.ent.gz | 162 KB | Display | PDB format |
PDBx/mmJSON format | 7xn9.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/xn/7xn9 ftp://data.pdbj.org/pub/pdb/validation_reports/xn/7xn9 | HTTPS FTP |
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-Related structure data
Related structure data | 7xmrC 7xmsC 7xmtC 7xnaC 4n6hS S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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Unit cell |
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-Components
#1: Protein | Mass: 66058.125 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: fusion protein of SSTR2 and Endo-1,4-beta-xylanase Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Niallia circulans (bacteria) Gene: SSTR2, xlnA / Production host: Insecta environmental sample (insect) References: UniProt: P30874, UniProt: P09850, endo-1,4-beta-xylanase |
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#2: Chemical | ChemComp-EPE / |
#3: Chemical | ChemComp-GI9 / |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 2.36 Å3/Da / Density % sol: 47.77 % |
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Crystal grow | Temperature: 293 K / Method: lipidic cubic phase / pH: 7 Details: 100-400 mM lithium nitrate, 6-10% PEG2000, 100 mM L-054,522, and 0.1 M HEPES, pH 7.0 |
-Data collection
Diffraction | Mean temperature: 80 K / Serial crystal experiment: N |
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Diffraction source | Source: SYNCHROTRON / Site: SPring-8 / Beamline: BL41XU / Wavelength: 1 Å |
Detector | Type: DECTRIS PILATUS3 6M / Detector: PIXEL / Date: Apr 15, 2017 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 1 Å / Relative weight: 1 |
Reflection | Resolution: 2.6→37.26 Å / Num. obs: 19455 / % possible obs: 99.2 % / Redundancy: 7.5 % / Biso Wilson estimate: 64 Å2 / CC1/2: 0.996 / Net I/σ(I): 10.91 |
Reflection shell | Resolution: 2.6→2.693 Å / Num. unique obs: 1875 / CC1/2: 0.755 |
-Processing
Software |
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 4N6H Resolution: 2.6→37.26 Å / SU ML: 0.3506 / Cross valid method: NONE / σ(F): 1.37 / Phase error: 26.2249 Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
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Solvent computation | Shrinkage radii: 0.9 Å / VDW probe radii: 1.11 Å / Solvent model: FLAT BULK SOLVENT MODEL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 64.25 Å2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: LAST / Resolution: 2.6→37.26 Å
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Refine LS restraints |
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LS refinement shell |
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Refinement TLS params. | Method: refined / Origin x: 10.2653442 Å / Origin y: 35.3038965762 Å / Origin z: 25.1864363393 Å
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Refinement TLS group | Selection details: all |