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- EMDB-33302: CryoEM structure of the somatostatin receptor 2 (SSTR2) in comple... -
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Open data
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Basic information
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Title | CryoEM structure of the somatostatin receptor 2 (SSTR2) in complex with Gi1 and its endogeneous peptide ligand SST-14 | |||||||||||||||||||||||||||
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Function / homology | ![]() somatostatin signaling pathway / MECP2 regulates transcription of neuronal ligands / somatostatin receptor activity / hormone-mediated apoptotic signaling pathway / peristalsis / neuropeptide binding / response to acidic pH / hyperosmotic response / cellular response to glucocorticoid stimulus / response to steroid hormone ...somatostatin signaling pathway / MECP2 regulates transcription of neuronal ligands / somatostatin receptor activity / hormone-mediated apoptotic signaling pathway / peristalsis / neuropeptide binding / response to acidic pH / hyperosmotic response / cellular response to glucocorticoid stimulus / response to steroid hormone / neuronal dense core vesicle / regulation of postsynaptic membrane neurotransmitter receptor levels / response to starvation / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / GABA-ergic synapse / Adenylate cyclase inhibitory pathway / neuropeptide signaling pathway / positive regulation of protein localization to cell cortex / response to amino acid / regulation of cAMP-mediated signaling / D2 dopamine receptor binding / G protein-coupled serotonin receptor binding / regulation of mitotic spindle organization / cellular response to forskolin / forebrain development / regulation of cell migration / digestion / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Peptide ligand-binding receptors / cerebellum development / response to nutrient / cellular response to estradiol stimulus / Regulation of insulin secretion / PDZ domain binding / G protein-coupled receptor binding / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G-protein activation / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / hormone activity / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / Sensory perception of sweet, bitter, and umami (glutamate) taste / response to peptide hormone / photoreceptor disc membrane / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / adenylate cyclase-activating dopamine receptor signaling pathway / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / GDP binding / G-protein beta-subunit binding / Inactivation, recovery and regulation of the phototransduction cascade / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / cell-cell signaling / retina development in camera-type eye / phospholipase C-activating G protein-coupled receptor signaling pathway / Ca2+ pathway / cell cortex / midbody / G alpha (i) signalling events / fibroblast proliferation / G alpha (s) signalling events / spermatogenesis / G alpha (q) signalling events / chemical synaptic transmission / cell population proliferation / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell surface receptor signaling pathway / response to xenobiotic stimulus / neuron projection / cell cycle / G protein-coupled receptor signaling pathway / negative regulation of cell population proliferation Similarity search - Function | |||||||||||||||||||||||||||
Biological species | ![]() | |||||||||||||||||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.1 Å | |||||||||||||||||||||||||||
![]() | Wenli Z / Shuo H / Na Q / Wenbo Z / Mengjie L / Dehua Y / Ming-Wei W / Wu B / Zhao Q | |||||||||||||||||||||||||||
Funding support | ![]()
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![]() | ![]() 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
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21 KB 21 KB | Display Display | ![]() |
Images | ![]() | 82.7 KB | ||
Others | ![]() ![]() | 49.5 MB 49.5 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 669.5 KB | Display | ![]() |
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Full document | ![]() | 669 KB | Display | |
Data in XML | ![]() | 12.1 KB | Display | |
Data in CIF | ![]() | 14.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7xmrMC ![]() 7xmsC ![]() 7xmtC ![]() 7xn9C ![]() 7xnaC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.045 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #1
File | emd_33302_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #2
File | emd_33302_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Complex structure of the somatostatin receptor 2 (SSTR2) in compl...
Entire | Name: Complex structure of the somatostatin receptor 2 (SSTR2) in complex with Gi1 and its endogeneous peptide ligand SST-14 |
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Components |
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-Supramolecule #1: Complex structure of the somatostatin receptor 2 (SSTR2) in compl...
Supramolecule | Name: Complex structure of the somatostatin receptor 2 (SSTR2) in complex with Gi1 and its endogeneous peptide ligand SST-14 type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
Recombinant expression | Organism: ![]() |
-Macromolecule #1: Somatostatin receptor type 2
Macromolecule | Name: Somatostatin receptor type 2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 45.308605 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: DYKDDDDGAP DMADEPLNGS HTWLSIPFDL NGSVVSTNTS NQTEPYYDLT SNAVLTFIYF VVCIIGLCGN TLVIYVILRY AKMKTITNI YILNLAIADE LFMLGLPFLA MQVALVHWPF GKAICRVVMT VDGINQFTSI FCLTVMSIDR YLAVVHPIKS A KWRRPRTA ...String: DYKDDDDGAP DMADEPLNGS HTWLSIPFDL NGSVVSTNTS NQTEPYYDLT SNAVLTFIYF VVCIIGLCGN TLVIYVILRY AKMKTITNI YILNLAIADE LFMLGLPFLA MQVALVHWPF GKAICRVVMT VDGINQFTSI FCLTVMSIDR YLAVVHPIKS A KWRRPRTA KMITMAVWGV SLLVILPIMI YAGLRSNQWG RSSCTINWPG ESGAWYTGFI IYTFILGFLV PLTIICLCYL FI IIKVKSS GIRVGSSKRK KSEKKVTRMV SIVVAVFIFC WLPFYIFNVS SVSMAISPTP ALKGMFDFVV VLTYANSCAN PIL YAFLSD NFKKSFQNVL CLVKVSGTDD GERSDSKQDK SRLNETTETQ RTEFLEVLFQ GPWSHPQFEK GGGSGGGSGG SAWS HPQFE K |
-Macromolecule #2: Guanine nucleotide-binding protein G(i) subunit alpha-1
Macromolecule | Name: Guanine nucleotide-binding protein G(i) subunit alpha-1 type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 40.435086 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKCTIV KQMKTIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKCTIV KQMKTIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVTAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKDCGLF |
-Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
Macromolecule | Name: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 38.744371 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI ...String: MHHHHHHGSL LQSELDQLRQ EAEQLKNQIR DARKACADAT LSQITNNIDP VGRIQMRTRR TLRGHLAKIY AMHWGTDSRL LVSASQDGK LIIWDSYTTN KVHAIPLRSS WVMTCAYAPS GNYVACGGLD NICSIYNLKT REGNVRVSRE LAGHTGYLSC C RFLDDNQI VTSSGDTTCA LWDIETGQQT TTFTGHTGDV MSLSLAPDTR LFVSGACDAS AKLWDVREGM CRQTFTGHES DI NAICFFP NGNAFATGSD DATCRLFDLR ADQELMTYSH DNIICGITSV SFSKSGRLLL AGYDDFNCNV WDALKADRAG VLA GHDNRV SCLGVTDDGM AVATGSWDSF LKIWN |
-Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Macromolecule | Name: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 7.861143 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L |
-Macromolecule #5: Somatostatin-14
Macromolecule | Name: Somatostatin-14 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 1.641909 KDa |
Sequence | String: AGCKNFFWKT FTSC |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Concentration | 1.0 mg/mL |
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Buffer | pH: 7.5 |
Grid | Material: NICKEL/TITANIUM |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 70.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 1.3 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 696255 |
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Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |