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- PDB-8zcj: Cryo-EM structure of the pasireotide-bound SSTR5-Gi complex -

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Basic information

Entry
Database: PDB / ID: 8zcj
TitleCryo-EM structure of the pasireotide-bound SSTR5-Gi complex
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • 004-DTR-LYS-TYR-PHA-HYP
  • Beta-2 adrenergic receptor,Somatostatin receptor type 5,lgbit (fusion protein)
  • ScFv16
KeywordsMEMBRANE PROTEIN/IMMUNE SYSTEM / pasireotide / SSTR5 / Cryo-EM / MEMBRANE PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


somatostatin receptor activity / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma / G beta:gamma signalling through CDC42 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / positive regulation of mini excitatory postsynaptic potential ...somatostatin receptor activity / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma / G beta:gamma signalling through CDC42 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / positive regulation of mini excitatory postsynaptic potential / beta2-adrenergic receptor activity / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Ca2+ pathway / negative regulation of smooth muscle contraction / G alpha (z) signalling events / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / AMPA selective glutamate receptor signaling pathway / norepinephrine-epinephrine-mediated vasodilation involved in regulation of systemic arterial blood pressure / positive regulation of autophagosome maturation / heat generation / norepinephrine binding / neuropeptide binding / Adrenaline,noradrenaline inhibits insulin secretion / ADP signalling through P2Y purinoceptor 12 / Adrenoceptors / G alpha (q) signalling events / G alpha (i) signalling events / positive regulation of lipophagy / Thrombin signalling through proteinase activated receptors (PARs) / Activation of G protein gated Potassium channels / G-protein activation / G beta:gamma signalling through PI3Kgamma / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through PLC beta / ADP signalling through P2Y purinoceptor 1 / Thromboxane signalling through TP receptor / Presynaptic function of Kainate receptors / G beta:gamma signalling through CDC42 / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G alpha (12/13) signalling events / Glucagon-type ligand receptors / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Adrenaline,noradrenaline inhibits insulin secretion / negative regulation of G protein-coupled receptor signaling pathway / negative regulation of multicellular organism growth / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Ca2+ pathway / cellular response to glucocorticoid stimulus / G alpha (z) signalling events / Thrombin signalling through proteinase activated receptors (PARs) / Extra-nuclear estrogen signaling / G alpha (s) signalling events / photoreceptor outer segment membrane / G alpha (q) signalling events / response to psychosocial stress / endosome to lysosome transport / adrenergic receptor signaling pathway / spectrin binding / G alpha (i) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / diet induced thermogenesis / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Vasopressin regulates renal water homeostasis via Aquaporins / positive regulation of cytokinesis / alkylglycerophosphoethanolamine phosphodiesterase activity / positive regulation of cAMP/PKA signal transduction / adenylate cyclase binding / smooth muscle contraction / photoreceptor outer segment / potassium channel regulator activity / positive regulation of bone mineralization / bone resorption / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuronal dense core vesicle / intercellular bridge / adenylate cyclase inhibitor activity / regulation of sodium ion transport / adenylate cyclase-activating adrenergic receptor signaling pathway / positive regulation of protein localization to cell cortex / T cell migration / positive regulation of relaxation of smooth muscle / Adenylate cyclase inhibitory pathway / cardiac muscle cell apoptotic process / response to prostaglandin E / D2 dopamine receptor binding / photoreceptor inner segment / G protein-coupled serotonin receptor binding / regulation of insulin secretion / adenylate cyclase-inhibiting serotonin receptor signaling pathway / brown fat cell differentiation / cellular response to forskolin / receptor-mediated endocytosis / response to cold / chemokine-mediated signaling pathway / Peptide ligand-binding receptors / regulation of mitotic spindle organization
Similarity search - Function
Somatostatin receptor 5 / Somatostatin receptor family / Beta 2 adrenoceptor / Adrenoceptor family / 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. ...Somatostatin receptor 5 / Somatostatin receptor family / Beta 2 adrenoceptor / Adrenoceptor family / 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 / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein coupled receptors family 1 signature. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / 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
Beta-2 adrenergic receptor / Somatostatin receptor type 5 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Similarity search - Component
Biological speciesHomo sapiens (human)
Rattus norvegicus (Norway rat)
Bos taurus (domestic cattle)
Oplophorus gracilirostris (crustacean)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.09 Å
AuthorsLi, Y.G. / Meng, X.Y. / Yang, X.R. / Ling, S.L. / Shi, P. / Tian, C.L. / Yang, F.
Funding support1items
OrganizationGrant numberCountry
Other government
CitationJournal: Acta Pharmacol Sin / Year: 2024
Title: Structural insights into somatostatin receptor 5 bound with cyclic peptides.
Authors: Ying-Ge Li / Xian-Yu Meng / Xiru Yang / Sheng-Long Ling / Pan Shi / Chang-Lin Tian / Fan Yang /
Abstract: Somatostatin receptor 5 (SSTR5) is highly expressed in ACTH-secreting pituitary adenomas and is an important drug target for the treatment of Cushing's disease. Two cyclic SST analog peptides ...Somatostatin receptor 5 (SSTR5) is highly expressed in ACTH-secreting pituitary adenomas and is an important drug target for the treatment of Cushing's disease. Two cyclic SST analog peptides (pasireotide and octreotide) both can activate SSTR5 and SSTR2. Pasireotide is preferential binding to SSTR5 than octreotide, while octreotide is biased to SSTR2 than SSTR5. The lack of selectivity of both pasireotide and octreotide causes side effects, such as hyperglycemia, gastrointestinal disturbance, and abnormal glucose homeostasis. However, little is known about the binding and selectivity mechanisms of pasireotide and octreotide with SSTR5, limiting the development of subtype-selective SST analog drugs specifically targeting SSTR5. Here, we report two cryo-electron microscopy (cryo-EM) structures of SSTR5-Gi complexes activated by pasireotide and octreoitde at resolutions of 3.09 Å and 3.24 Å, respectively. In combination with structural analysis and functional experiments, our results reveal the molecular mechanisms of ligand recognition and receptor activation. We also demonstrate that pasireotide preferentially binds to SSTR5 through the interactions between Tyr(Bzl)/Trp of pasireotide and SSTR5. Moreover, we find that the Q, N, F and ECL2 of SSTR2 play a crucial role in octreotide biased binding of SSTR2. Our results will provide structural insights and offer new opportunities for the drug discovery of better selective pharmaceuticals targeting specific SSTR subtypes.
History
DepositionApr 29, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Jul 10, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 30, 2024Group: Data collection / Database references / Structure summary
Category: citation / em_admin ...citation / em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
B: Guanine nucleotide-binding protein G(i) subunit alpha-1
C: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
D: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
E: ScFv16
G: Beta-2 adrenergic receptor,Somatostatin receptor type 5,lgbit (fusion protein)
A: 004-DTR-LYS-TYR-PHA-HYP


Theoretical massNumber of molelcules
Total (without water)184,9766
Polymers184,9766
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Guanine nucleotide-binding protein ... , 3 types, 3 molecules BCD

#1: Protein Guanine nucleotide-binding protein G(i) subunit alpha-1 / Adenylate cyclase-inhibiting G alpha protein


Mass: 40445.059 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAI1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P63096
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 41055.867 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Gnb1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P54311
#3: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7861.143 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P63212

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Antibody / Protein / Protein/peptide , 3 types, 3 molecules EGA

#4: Antibody ScFv16


Mass: 32724.473 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Spodoptera frugiperda (fall armyworm)
#5: Protein Beta-2 adrenergic receptor,Somatostatin receptor type 5,lgbit (fusion protein) / Beta-2 adrenoreceptor / Beta-2 adrenoceptor / SS-5-R / SS5-R / SS5R / SST5


Mass: 62015.930 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Oplophorus gracilirostris (crustacean)
Gene: ADRB2, ADRB2R, B2AR, SSTR5 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P07550, UniProt: P35346
#6: Protein/peptide 004-DTR-LYS-TYR-PHA-HYP


Mass: 874.016 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: pasireotide-SSTR5-Gi complex / Type: COMPLEX / Entity ID: #1-#5 / Source: RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Homo sapiens (human)9606
31Bos taurus (domestic cattle)9913
41Rattus norvegicus (Norway rat)10116
51Oplophorus gracilirostris (crustacean)727944
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: DIFFRACTION / Nominal defocus max: 2000 nm / Nominal defocus min: 1400 nm
Image recordingElectron dose: 55 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.20.1_4487: / Category: model refinement
CTF correctionType: NONE
3D reconstructionResolution: 3.09 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 1227503 / Symmetry type: POINT
RefinementCross valid method: NONE

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