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- EMDB-32543: Cryo-EM structure of human somatostatin receptor 2 complex with i... -
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Open data
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Basic information
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Title | Cryo-EM structure of human somatostatin receptor 2 complex with its agonist somatostatin delineates the ligand binding specificity | |||||||||
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![]() | GPCR / agonist / heterotrimeric G-protein / cAMP / MEMBRANE PROTEIN / MEMBRANE PROTEIN-IMMUNE SYSTEM complex | |||||||||
Function / homology | ![]() somatostatin receptor activity / peristalsis / neuropeptide binding / cellular response to glucocorticoid stimulus / response to starvation / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / positive regulation of protein localization to cell cortex / Adenylate cyclase inhibitory pathway / T cell migration ...somatostatin receptor activity / peristalsis / neuropeptide binding / cellular response to glucocorticoid stimulus / response to starvation / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / positive regulation of protein localization to cell cortex / Adenylate cyclase inhibitory pathway / T cell migration / forebrain development / D2 dopamine receptor binding / response to prostaglandin E / G protein-coupled serotonin receptor binding / adenylate cyclase regulator activity / adenylate cyclase-inhibiting serotonin receptor signaling pathway / cellular response to forskolin / cerebellum development / regulation of mitotic spindle organization / Peptide ligand-binding receptors / PDZ domain binding / Regulation of insulin secretion / cellular response to estradiol stimulus / positive regulation of cholesterol biosynthetic process / G protein-coupled receptor binding / electron transport chain / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / response to peptide hormone / G-protein beta/gamma-subunit complex binding / centriolar satellite / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / photoreceptor disc membrane / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / GDP binding / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / G protein activity / GTPase binding / Ca2+ pathway / retina development in camera-type eye / midbody / cell cortex / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / fibroblast proliferation / G alpha (i) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / spermatogenesis / G alpha (q) signalling events / Ras protein signal transduction / periplasmic space / electron transfer activity / Extra-nuclear estrogen signaling / cell population proliferation / neuron projection / ciliary basal body / G protein-coupled receptor signaling pathway / iron ion binding / lysosomal membrane / negative regulation of cell population proliferation / cell division / GTPase activity / synapse / heme binding / centrosome Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.72 Å | |||||||||
![]() | Heo YS / Yoon EJ / Jeon YE / Yun J-H / Ishimoto N / Woo H / Park SY / Song J / Lee WT | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Cryo-EM structure of the human somatostatin receptor 2 complex with its agonist somatostatin delineates the ligand-binding specificity. Authors: Yunseok Heo / Eojin Yoon / Ye-Eun Jeon / Ji-Hye Yun / Naito Ishimoto / Hyeonuk Woo / Sam-Yong Park / Ji-Joon Song / Weontae Lee / ![]() ![]() Abstract: Somatostatin is a peptide hormone that regulates endocrine systems by binding to G-protein-coupled somatostatin receptors. Somatostatin receptor 2 (SSTR2) is a human somatostatin receptor and is ...Somatostatin is a peptide hormone that regulates endocrine systems by binding to G-protein-coupled somatostatin receptors. Somatostatin receptor 2 (SSTR2) is a human somatostatin receptor and is highly implicated in hormone disorders, cancers, and neurological diseases. Here, we report the high-resolution cryo-EM structure of full-length human SSTR2 bound to the agonist somatostatin (SST-14) in complex with inhibitory G (G) proteins. Our structural and mutagenesis analyses show that seven transmembrane helices form a deep pocket for ligand binding and that SSTR2 recognizes the highly conserved Trp-Lys motif of SST-14 at the bottom of the pocket. Furthermore, our sequence analysis combined with AlphaFold modeled structures of other SSTR isoforms provide a structural basis for the mechanism by which SSTR family proteins specifically interact with their cognate ligands. This work provides the first glimpse into the molecular recognition mechanism of somatostatin receptors and a crucial resource to develop therapeutics targeting somatostatin receptors. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 59.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 21.4 KB 21.4 KB | Display Display | ![]() |
Images | ![]() | 92.9 KB | ||
Filedesc metadata | ![]() | 7.3 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7wj5MC 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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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.829 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
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Sample components
-Entire : human SSTR2 and SST-14 complex
Entire | Name: human SSTR2 and SST-14 complex |
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Components |
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-Supramolecule #1: human SSTR2 and SST-14 complex
Supramolecule | Name: human SSTR2 and SST-14 complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: 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: 1 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 40.415031 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI ...String: MGCTLSAEDK AAVERSKMID RNLREDGEKA AREVKLLLLG AGESGKSTIV KQMKIIHEAG YSEEECKQYK AVVYSNTIQS IIAIIRAMG RLKIDFGDSA RADDARQLFV LAGAAEEGFM TAELAGVIKR LWKDSGVQAC FNRSREYQLN DSAAYYLNDL D RIAQPNYI PTQQDVLRTR VKTTGIVETH FTFKDLHFKM FDVGGQRSER KKWIHCFEGV TAIIFCVALS DYDLVLAEDE EM NRMHESM KLFDSICNNK WFTDTSIILF LNKKDLFEEK IKKSPLTICY PEYAGSNTYE EAAAYIQCQF EDLNKRKDTK EIY THFTCA TDTKNVQFVF DAVTDVIIKN NLKDCGLF UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-1 |
-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: 39.418086 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MHHHHHHLEV LFQGPGSSGS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLV SASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG H TGYLSCCR ...String: MHHHHHHLEV LFQGPGSSGS ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLV SASQDGKLII WDSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG H TGYLSCCR FLDDNQIVTS SGDTTCALWD IETGQQTTTF TGHTGDVMSL SLAPDTRLFV SGACDASAKL WDVREGMCRQ TF TGHESDI NAICFFPNGN AFATGSDDAT CRLFDLRADQ ELMTYSHDNI ICGITSVSFS KSGRLLLAGY DDFNCNVWDA LKA DRAGVL AGHDNRVSCL GVTDDGMAVA TGSWDSFLKI WN UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 |
-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 UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 |
-Macromolecule #4: Gai1 antibody (scfv16)
Macromolecule | Name: Gai1 antibody (scfv16) / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 28.636793 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 KAAAENLYFQ GHHHHHHHH |
-Macromolecule #5: Soluble cytochrome b562,Somatostatin receptor type 2
Macromolecule | Name: Soluble cytochrome b562,Somatostatin receptor type 2 / type: protein_or_peptide / ID: 5 Details: The fusion protein of expression tags, Soluble cytochrome b562, linker and Somatostatin receptor type 2. Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 58.163469 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MKTIIALSYI FCLVFADYKD DDDKHHHHHH HHLEVLFQGP GAPADLEDNW ETLNDNLKVI EKADNAAQVK DALTKMRAAA LDAQKATPP KLEDKSPDSP EMKDFRHGFD ILVGQIDDAL KLANEGKVKE AQAAAEQLKT TRNAYIQKYL MDMADEPLNG S HTWLSIPF ...String: MKTIIALSYI FCLVFADYKD DDDKHHHHHH HHLEVLFQGP GAPADLEDNW ETLNDNLKVI EKADNAAQVK DALTKMRAAA LDAQKATPP KLEDKSPDSP EMKDFRHGFD ILVGQIDDAL KLANEGKVKE AQAAAEQLKT TRNAYIQKYL MDMADEPLNG S HTWLSIPF DLNGSVVSTN TSNQTEPYYD LTSNAVLTFI YFVVCIIGLC GNTLVIYVIL RYAKMKTITN IYILNLAIAD EL FMLGLPF LAMQVALVHW PFGKAICRVV MTVDGINQFT SIFCLTVMSI DRYLAVVHPI KSAKWRRPRT AKMITMAVWG VSL LVILPI MIYAGLRSNQ WGRSSCTINW PGESGAWYTG FIIYTFILGF LVPLTIICLC YLFIIIKVKS SGIRVGSSKR KKSE KKVTR MVSIVVAVFI FCWLPFYIFN VSSVSMAISP TPALKGMFDF VVVLTYANSC ANPILYAFLS DNFKKSFQNV LCLVK VSGT DDGERSDSKQ DKSRLNETTE TQRTLLNGDL QTSI UniProtKB: Soluble cytochrome b562, Somatostatin receptor type 2 |
-Macromolecule #6: Somatostatin-14 (SST-14)
Macromolecule | Name: Somatostatin-14 (SST-14) / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 1.641909 KDa |
Recombinant expression | Organism: ![]() ![]() |
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 | 4 mg/mL | |||||||||||||||||||||
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Buffer | pH: 7.5 Component:
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Grid | Model: Quantifoil R2/1 / Material: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE | |||||||||||||||||||||
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 298 K / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Frames/image: 2-35 / Number grids imaged: 1 / Number real images: 5523 / Average electron dose: 55.04 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | C2 aperture diameter: 100.0 µm / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.4 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 75000 |
Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Protocol: RIGID BODY FIT |
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Output model | ![]() PDB-7wj5: |