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- EMDB-25587: CryoEM structure of somatostatin receptor 2 in complex with Octre... -
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Basic information
Entry | Database: EMDB / ID: EMD-25587 | |||||||||
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Title | CryoEM structure of somatostatin receptor 2 in complex with Octreotide and Gi3. | |||||||||
![]() | CryoEM single particle reconstruction of SSTR2/Gi3 complex with octreotide. | |||||||||
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Function / homology | ![]() dynorphin receptor activity / response to acrylamide / regulation of saliva secretion / sensory perception of temperature stimulus / positive regulation of eating behavior / somatostatin receptor activity / adenylate cyclase-inhibiting opioid receptor signaling pathway / G protein-coupled opioid receptor activity / negative regulation of luteinizing hormone secretion / G protein-coupled opioid receptor signaling pathway ...dynorphin receptor activity / response to acrylamide / regulation of saliva secretion / sensory perception of temperature stimulus / positive regulation of eating behavior / somatostatin receptor activity / adenylate cyclase-inhibiting opioid receptor signaling pathway / G protein-coupled opioid receptor activity / negative regulation of luteinizing hormone secretion / G protein-coupled opioid receptor signaling pathway / peristalsis / positive regulation of dopamine secretion / sensory perception / positive regulation of potassium ion transmembrane transport / conditioned place preference / negative regulation of adenylate cyclase activity / maternal behavior / receptor serine/threonine kinase binding / neuropeptide binding / GTP metabolic process / cellular response to glucocorticoid stimulus / positive regulation of p38MAPK cascade / G protein-coupled dopamine receptor signaling pathway / eating behavior / response to starvation / behavioral response to cocaine / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / positive regulation of macroautophagy / estrous cycle / Adenylate cyclase inhibitory pathway / neuropeptide signaling pathway / MECP2 regulates neuronal receptors and channels / axon terminus / forebrain development / sensory perception of pain / T-tubule / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Peptide ligand-binding receptors / cerebellum development / sarcoplasmic reticulum / locomotory behavior / cellular response to estradiol stimulus / PDZ domain binding / G protein-coupled receptor binding / cellular response to glucose stimulus / response to nicotine / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / response to insulin / 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 / 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 / synaptic vesicle membrane / 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 / response to estrogen / 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 / retina development in camera-type eye / presynaptic membrane / phospholipase C-activating G protein-coupled receptor signaling pathway / Ca2+ pathway / midbody / G alpha (i) signalling events / fibroblast proliferation / G alpha (s) signalling events / spermatogenesis Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.7 Å | |||||||||
![]() | Robertson MJ / Skinotis G | |||||||||
Funding support | 1 items
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![]() | ![]() Title: Plasticity in ligand recognition at somatostatin receptors. Authors: Michael J Robertson / Justin G Meyerowitz / Ouliana Panova / Kenneth Borrelli / Georgios Skiniotis / ![]() 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 ...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 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. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 167.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 17.1 KB 17.1 KB | Display Display | ![]() |
Images | ![]() | 79.6 KB | ||
Others | ![]() | 168 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 439.6 KB | Display | ![]() |
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Full document | ![]() | 439.2 KB | Display | |
Data in XML | ![]() | 7 KB | Display | |
Data in CIF | ![]() | 8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7t11MC ![]() 7t10C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | |
EM raw data | ![]() Data size: 4.2 TB Data #1: Raw movies of SSTR2/Octreotide/Gi3 complex collected on a K3 [micrographs - multiframe]) |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Annotation | CryoEM single particle reconstruction of SSTR2/Gi3 complex with octreotide. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.8521 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: Focused refinement on receptor and G alpha I...
File | emd_25587_additional_1.map | ||||||||||||
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Annotation | Focused refinement on receptor and G alpha I CryoEM single particle reconstruction of SSTR2/Gi3 complex with octreotide. | ||||||||||||
Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Somatostatin receptor 2 in complex with Octreotide and Gi3.
Entire | Name: Somatostatin receptor 2 in complex with Octreotide and Gi3. |
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Components |
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-Supramolecule #1: Somatostatin receptor 2 in complex with Octreotide and Gi3.
Supramolecule | Name: Somatostatin receptor 2 in complex with Octreotide and Gi3. type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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-Macromolecule #1: Guanine nucleotide-binding protein G(i) subunit alpha-3
Macromolecule | Name: Guanine nucleotide-binding protein G(i) subunit alpha-3 type: protein_or_peptide / ID: 1 / Details: dominant negative / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 40.584156 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AKEVKLLLLG AGESGKNTIV KQMKIIHEDG YSEDECKQYK VVVYSNTIQS IIAIIRAMG RLKIDFGEAA RADDARQLFV LAGSAEEGVM TPELAGVIKR LWRDGGVQAC FSRSREYQLN DSASYYLNDL D RISQSNYI ...String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AKEVKLLLLG AGESGKNTIV KQMKIIHEDG YSEDECKQYK VVVYSNTIQS IIAIIRAMG RLKIDFGEAA RADDARQLFV LAGSAEEGVM TPELAGVIKR LWRDGGVQAC FSRSREYQLN DSASYYLNDL D RISQSNYI PTQQDVLRTR VKTTGIVETH FTFKDLYFKM FDVGAQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHASM KLFDSICNNK WFTETSIILF LNKKDLFEEK IKRSPLTICY PEYTGSNTYE EAAAYIQCQF EDLNRRKDTK EIY THFTCS TDTKNVQFVF DAVTDVIIKN NLKECGLY |
-Macromolecule #2: 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: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 37.671102 KDa |
Recombinant expression | Organism: ![]() |
Sequence | String: PGSSGSELDQ LRQEAEQLKN QIRDARKACA DATLSQITNN IDPVGRIQMR TRRTLRGHLA KIYAMHWGTD SRLLVSASQD GKLIIWDSY TTNKVHAIPL RSSWVMTCAY APSGNYVACG GLDNICSIYN LKTREGNVRV SRELAGHTGY LSCCRFLDDN Q IVTSSGDT ...String: PGSSGSELDQ LRQEAEQLKN QIRDARKACA DATLSQITNN IDPVGRIQMR TRRTLRGHLA KIYAMHWGTD SRLLVSASQD GKLIIWDSY TTNKVHAIPL RSSWVMTCAY APSGNYVACG GLDNICSIYN LKTREGNVRV SRELAGHTGY LSCCRFLDDN Q IVTSSGDT TCALWDIETG QQTTTFTGHT GDVMSLSLAP DTRLFVSGAC DASAKLWDVR EGMCRQTFTG HESDINAICF FP NGNAFAT GSDDATCRLF DLRADQELMT YSHDNIICGI TSVSFSKSGR LLLAGYDDFN CNVWDALKAD RAGVLAGHDN RVS CLGVTD DGMAVATGSW DSFLKIWN |
-Macromolecule #3: 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: 3 / 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 #4: scFv16
Macromolecule | Name: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 27.784896 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL KAAAHHHHHH HH |
-Macromolecule #5: Octreotide
Macromolecule | Name: Octreotide / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: synthetic construct (others) |
Molecular weight | Theoretical: 1.022263 KDa |
Sequence | String: (DPN)CF(DTR)KTC(THO) |
-Macromolecule #6: Somatostatin receptor type 2,Kappa-type opioid receptor
Macromolecule | Name: Somatostatin receptor type 2,Kappa-type opioid receptor type: protein_or_peptide / ID: 6 Details: Somatostatin receptor type 2 with intracellular loop 3 (ICL3) replaced with the ICL3 from the Kappa-type opioid receptor Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 45.784211 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: DYKDDDDAMG QPGNGSAFLL APNRSHAPDH DVENLYFQGM DMADEPLNGS HTWLSIPFDL NGSVVSTNTS NQTEPYYDLT SNAVLTFIY FVVCIIGLCG NTLVIYVILR YAKMKTITNI YILNLAIADE LFMLGLPFLA MQVALVHWPF GKAICRVVMT V DGINQFTS ...String: DYKDDDDAMG QPGNGSAFLL APNRSHAPDH DVENLYFQGM DMADEPLNGS HTWLSIPFDL NGSVVSTNTS NQTEPYYDLT SNAVLTFIY FVVCIIGLCG NTLVIYVILR YAKMKTITNI YILNLAIADE LFMLGLPFLA MQVALVHWPF GKAICRVVMT V DGINQFTS IFCLTVMSID RYLAVVHPIK SAKWRRPRTA KMITMAVWGV SLLVILPIMI YAGLRSNQWG RSSCTINWPG ES GAWYTGF IIYTFILGFL VPLTIICLCY LFIIIKVKSV RLLSGSREKD RNLRKVTRMV SIVVAVFIFC WLPFYIFNVS SVS MAISPT PALKGMFDFV VVLTYANSCA NPILYAFLSD NFKKSFQNVL CLVKVSGTDD GERSDSKQDK SRLNETTETQ RTLL NGDLQ TSI |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Grid | Material: GOLD |
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 (6k x 4k) / Average electron dose: 1.22 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: OTHER / Details: ab initio |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 281479 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |