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- EMDB-39903: Cryo-EM structure of Somatostatin receptor 5 (SSTR5) with Gi1 complex -

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Basic information

Entry
Database: EMDB / ID: EMD-39903
TitleCryo-EM structure of Somatostatin receptor 5 (SSTR5) with Gi1 complex
Map data
Sample
  • Complex: Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex
    • Protein or peptide: Somatostatin-14
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: scFv16
    • Protein or peptide: Soluble cytochrome b562,Somatostatin receptor type 5
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1
KeywordsGPCR / ScFv16 / seven transmembrane / MEMBRANE PROTEIN
Function / homology
Function and homology information


somatostatin signaling pathway / MECP2 regulates transcription of neuronal ligands / somatostatin receptor activity / hormone-mediated apoptotic signaling pathway / hyperosmotic response / neuropeptide binding / response to acidic pH / response to steroid hormone / cellular response to glucocorticoid stimulus / neuronal dense core vesicle ...somatostatin signaling pathway / MECP2 regulates transcription of neuronal ligands / somatostatin receptor activity / hormone-mediated apoptotic signaling pathway / hyperosmotic response / neuropeptide binding / response to acidic pH / response to steroid hormone / cellular response to glucocorticoid stimulus / neuronal dense core vesicle / positive regulation of cytokinesis / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / response to amino acid / neuropeptide signaling pathway / regulation of postsynaptic membrane neurotransmitter receptor levels / positive regulation of protein localization to cell cortex / Adenylate cyclase inhibitory pathway / T cell migration / D2 dopamine receptor binding / digestion / response to prostaglandin E / G protein-coupled serotonin receptor binding / adenylate cyclase regulator activity / adenylate cyclase-inhibiting serotonin receptor signaling pathway / response to nutrient / cellular response to forskolin / regulation of insulin secretion / regulation of mitotic spindle organization / regulation of cell migration / Peptide ligand-binding receptors / GABA-ergic synapse / Regulation of insulin secretion / positive regulation of cholesterol biosynthetic process / G protein-coupled receptor binding / electron transport chain / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / hormone activity / 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 / cell-cell signaling / 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 / chemical synaptic transmission / G alpha (q) signalling events / Ras protein signal transduction / periplasmic space / electron transfer activity / Extra-nuclear estrogen signaling / cell population proliferation
Similarity search - Function
Somatostatin receptor 5 / Somatostatin / Somatostatin/Cortistatin, C-terminal / Somatostatin/Cortistatin family / Somatostatin receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx ...Somatostatin receptor 5 / Somatostatin / Somatostatin/Cortistatin, C-terminal / Somatostatin/Cortistatin family / Somatostatin receptor family / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / WD domain, G-beta repeat / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Soluble cytochrome b562 / Somatostatin receptor type 5 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Somatostatin / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.94 Å
AuthorsKim Y / Yun JH
Funding support Korea, Republic Of, 1 items
OrganizationGrant numberCountry
Institute for Basic ScienceIBS-R021-D1-2024-a00 Korea, Republic Of
CitationJournal: To Be Published
Title: The structure of SSTR3 and SSTR5 provide insights into the specificity among somatostatin receptos.
Authors: Heo Y / Kim Y / Cho M / Kim C / Ryu B / Kang HJ / Lee W / Yun JH
History
DepositionApr 26, 2024-
Header (metadata) releaseApr 30, 2025-
Map releaseApr 30, 2025-
UpdateApr 30, 2025-
Current statusApr 30, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

Downloads & links

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Map

FileDownload / File: emd_39903.map.gz / Format: CCP4 / Size: 59.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 250 pix.
= 212. Å
0.85 Å/pix.
x 250 pix.
= 212. Å
0.85 Å/pix.
x 250 pix.
= 212. Å

Surface

Projections

Slices (1/3)

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Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.848 Å
Density
Contour LevelBy AUTHOR: 0.118
Minimum - Maximum-0.98968035 - 1.5060115
Average (Standard dev.)0.0007632707 (±0.03171827)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions250250250
Spacing250250250
CellA=B=C: 212.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_39903_msk_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

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Half map: #1

Fileemd_39903_half_map_1.map
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_39903_half_map_2.map
Projections & Slices
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Sample components

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Entire : Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex

EntireName: Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex
Components
  • Complex: Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex
    • Protein or peptide: Somatostatin-14
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Protein or peptide: scFv16
    • Protein or peptide: Soluble cytochrome b562,Somatostatin receptor type 5
    • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-1

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Supramolecule #1: Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex

SupramoleculeName: Cryo-EM structure of Human Somatostatin 5 receptor-Gialpha1 complex
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 150 KDa

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Macromolecule #1: Somatostatin-14

MacromoleculeName: Somatostatin-14 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 1.641909 KDa
Recombinant expressionOrganism: synthetic construct (others)
SequenceString:
AGCKNFFWKT FTSC

UniProtKB: Somatostatin

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Macromolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: 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
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.728152 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: GPGSSGSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD ...String:
GPGSSGSELD QLRQEAEQLK NQIRDARKAC ADATLSQITN NIDPVGRIQM RTRRTLRGHL AKIYAMHWGT DSRLLVSASQ DGKLIIWDS YTTNKVHAIP LRSSWVMTCA YAPSGNYVAC GGLDNICSIY NLKTREGNVR VSRELAGHTG YLSCCRFLDD N QIVTSSGD TTCALWDIET GQQTTTFTGH TGDVMSLSLA PDTRLFVSGA CDASAKLWDV REGMCRQTFT GHESDINAIC FF PNGNAFA TGSDDATCRL FDLRADQELM TYSHDNIICG ITSVSFSKSG RLLLAGYDDF NCNVWDALKA DRAGVLAGHD NRV SCLGVT DDGMAVATGS WDSFLKIWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: 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
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #4: scFv16

MacromoleculeName: scFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 31.617367 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MLLVNQSHQG FNKEHTSKMV SAIVLYVLLA AAAHSAFADV QLVESGGGLV QPGGSRKLSC SASGFAFSSF GMHWVRQAPE KGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSEDT AMYYCVRSIY YYGSSPFDFW GQGTTLTVSS G GGGSGGGG ...String:
MLLVNQSHQG FNKEHTSKMV SAIVLYVLLA AAAHSAFADV QLVESGGGLV QPGGSRKLSC SASGFAFSSF GMHWVRQAPE KGLEWVAYI SSGSGTIYYA DTVKGRFTIS RDDPKNTLFL QMTSLRSEDT AMYYCVRSIY YYGSSPFDFW GQGTTLTVSS G GGGSGGGG SGGGGSDIVM TQATSSVPVT PGESVSISCR SSKSLLHSNG NTYLYWFLQR PGQSPQLLIY RMSNLASGVP DR FSGSGSG TAFTLTISRL EAEDVGVYYC MQHLEYPLTF GAGTKLELKA AAENLYFQG

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Macromolecule #5: Soluble cytochrome b562,Somatostatin receptor type 5

MacromoleculeName: Soluble cytochrome b562,Somatostatin receptor type 5 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 51.002328 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: ADLEDNWETL NDNLKVIEKA DNAAQVKDAL TKMRAAALDA QKATPPKLED KSPDSPEMKD FRHGFDILVG QIDDALKLAN EGKVKEAQA AAEQLKTTRN AYIQKYLMEP LFPASTPSWN ASSPGAASGG GDNRTLVGPA PSAGARAVLV PVLYLLVCAA G LGGNTLVI ...String:
ADLEDNWETL NDNLKVIEKA DNAAQVKDAL TKMRAAALDA QKATPPKLED KSPDSPEMKD FRHGFDILVG QIDDALKLAN EGKVKEAQA AAEQLKTTRN AYIQKYLMEP LFPASTPSWN ASSPGAASGG GDNRTLVGPA PSAGARAVLV PVLYLLVCAA G LGGNTLVI YVVLRFAKMK TVTNIYILNL AVADVLYMLG LPFLATQNAA SFWPFGPVLC RLVMTLDGVN QFTSVFCLTV MS VDRYLAV VHPLSSARWR RPRVAKLASA AAWVLSLCMS LPLLVFADVQ EGGTCNASWP EPVGLWGAVF IIYTAVLGFF APL LVICLC YLLIVVKVRA AGVRVGCVRR RSERKVTRMV LVVVLVFAGC WLPFFTVNIV NLAVALPQEP ASAGLYFFVV ILSY ANSCA NPVLYGFLSD NFRQSFQKVL CLRKGSGAKD ADATEPRPDR IRQQQEATPP AHRAAANGLM QTSKL

UniProtKB: Soluble cytochrome b562, Somatostatin receptor type 5

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Macromolecule #6: Guanine nucleotide-binding protein G(i) subunit alpha-1

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-1
type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.415031 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: 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

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration3.0 mg/mL
BufferpH: 7.5
Component:
ConcentrationFormulaName
20.0 mMHEPES2-[4-(2-Hydroxyethyl)-1-piperazinyl]ethanesulfonic acid
100.0 mMNaClsodium chloride
1.0 mMMgCl2magnesium chloride
0.5 mMTCEPTris(2-carboxyethyl)phosphine
0.001 %(w/v)LMNGLauryl Maltose Neopentyl Glycol
0.0001 %(w/v)CHSCholesteryl Hemisuccinate Tris Salt
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Number real images: 10000 / Average electron dose: 67.7 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 1.7 µm / Nominal defocus min: 0.7000000000000001 µm / Nominal magnification: 130000
Sample stageSpecimen 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

Particle selectionNumber selected: 4656722
Startup modelType of model: NONE
Final reconstructionNumber classes used: 1 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 2.94 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 247223
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 3.3.2)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

chain_id: A, source_name: PDB, initial_model_type: experimental model

chain_id: C, source_name: PDB, initial_model_type: experimental model

chain_id: E, source_name: PDB, initial_model_type: experimental model

chain_id: F, source_name: PDB, initial_model_type: experimental model
Output model

PDB-8zbj:
Cryo-EM structure of Somatostatin receptor 5 (SSTR5) with Gi1 complex

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