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- EMDB-26592: CryoEM Structure of Inactive SSTR2 bound to Nb6 -

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Basic information

Entry
Database: EMDB / ID: EMD-26592
TitleCryoEM Structure of Inactive SSTR2 bound to Nb6
Map data
Sample
  • Complex: Complex of SSTR2 and Nb6
    • Complex: SSTR2
      • Protein or peptide: Somatostatin receptor type 2
    • Complex: Nb6
      • Protein or peptide: Nanobody 6
KeywordsAntagonist / Complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


response to acrylamide / regulation of saliva secretion / dynorphin receptor activity / 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 ...response to acrylamide / regulation of saliva secretion / dynorphin receptor activity / 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 / maternal behavior / conditioned place preference / receptor serine/threonine kinase binding / neuropeptide binding / cellular response to glucocorticoid stimulus / positive regulation of p38MAPK cascade / eating behavior / response to starvation / behavioral response to cocaine / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / estrous cycle / 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 / cerebellum development / Peptide ligand-binding receptors / sarcoplasmic reticulum / cellular response to estradiol stimulus / locomotory behavior / PDZ domain binding / cellular response to glucose stimulus / response to nicotine / response to insulin / synaptic vesicle membrane / response to estrogen / presynaptic membrane / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (i) signalling events / cellular response to lipopolysaccharide / spermatogenesis / chemical synaptic transmission / perikaryon / defense response to virus / postsynaptic membrane / response to ethanol / neuron projection / immune response / negative regulation of cell population proliferation / dendrite / mitochondrion / nucleoplasm / membrane / plasma membrane / cytosol
Similarity search - Function
Kappa opioid receptor / Somatostatin receptor 2 / Somatostatin receptor family / Opioid receptor / Serpentine type 7TM GPCR chemoreceptor Srsx / 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)
Similarity search - Domain/homology
Somatostatin receptor type 2 / Kappa-type opioid receptor
Similarity search - Component
Biological speciesHomo sapiens (human) / Lama glama (llama)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsRobertson MJ / Skiniotis G
Funding support United States, 1 items
OrganizationGrant numberCountry
The G. Harold and Leila Y. Mathers Foundation United States
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Structure determination of inactive-state GPCRs with a universal nanobody.
Authors: Michael J Robertson / Makaía M Papasergi-Scott / Feng He / Alpay B Seven / Justin G Meyerowitz / Ouliana Panova / Maria Claudia Peroto / Tao Che / Georgios Skiniotis /
Abstract: Cryogenic electron microscopy (cryo-EM) has widened the field of structure-based drug discovery by allowing for routine determination of membrane protein structures previously intractable. Despite ...Cryogenic electron microscopy (cryo-EM) has widened the field of structure-based drug discovery by allowing for routine determination of membrane protein structures previously intractable. Despite representing one of the largest classes of therapeutic targets, most inactive-state G protein-coupled receptors (GPCRs) have remained inaccessible for cryo-EM because their small size and membrane-embedded nature impedes projection alignment for high-resolution map reconstructions. Here we demonstrate that the same single-chain camelid antibody (nanobody) recognizing a grafted intracellular loop can be used to obtain cryo-EM structures of inactive-state GPCRs at resolutions comparable or better than those obtained by X-ray crystallography. Using this approach, we obtained structures of neurotensin 1 receptor bound to antagonist SR48692, μ-opioid receptor bound to alvimopan, apo somatostatin receptor 2 and histamine receptor 2 bound to famotidine. We expect this rapid, straightforward approach to facilitate the broad exploration of GPCR inactive states without the need for extensive engineering and crystallization.
History
DepositionApr 3, 2022-
Header (metadata) releaseJun 29, 2022-
Map releaseJun 29, 2022-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26592.png

Downloads & links

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Map

FileDownload / File: emd_26592.map.gz / Format: CCP4 / Size: 125 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 320 pix.
= 272.672 Å		0.85 Å/pix.
x 320 pix.
= 272.672 Å		0.85 Å/pix.
x 320 pix.
= 272.672 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8521 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 1.43
Minimum - Maximum-3.5043747 - 5.6657085
Average (Standard dev.)-0.0009608886 (±0.087801054)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 272.672 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_26592_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_26592_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Complex of SSTR2 and Nb6

EntireName: Complex of SSTR2 and Nb6
Components
  • Complex: Complex of SSTR2 and Nb6
    • Complex: SSTR2
      • Protein or peptide: Somatostatin receptor type 2
    • Complex: Nb6
      • Protein or peptide: Nanobody 6

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Supramolecule #1: Complex of SSTR2 and Nb6

SupramoleculeName: Complex of SSTR2 and Nb6 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #2: SSTR2

SupramoleculeName: SSTR2 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Nb6

SupramoleculeName: Nb6 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Lama glama (llama)

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Macromolecule #1: Somatostatin receptor type 2

MacromoleculeName: Somatostatin receptor type 2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.542086 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: 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 RNLRRVTRMV SIVVAVFIFC WLPFYIFNVS SVS MAISPT PALKGMFDFV VVLTYANSCA NPILYAFLSD NFKKSFQNVL CLVKVSGTDD GERSDSKQDK SRLNETTETQ RTLL NGDLQ TSILEVLFQ

UniProtKB: Somatostatin receptor type 2, Kappa-type opioid receptor, Somatostatin receptor type 2

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Macromolecule #2: Nanobody 6

MacromoleculeName: Nanobody 6 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Lama glama (llama)
Molecular weightTheoretical: 14.730255 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MAQVQLQESG GGLVQAGESL RLSCAASGTI FRLYDMGWYR RVSGNQRELV ASITSGGSTK YGDSVKGRFT ISRDNAKNTV YLQMSSLKP EDTAVYYCNA EYRTGIWEEL LDGWGQGTQV TVSSHHHHHH EPEA

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 68.93 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 263630
Initial angle assignmentType: OTHER
Final angle assignmentType: ANGULAR RECONSTITUTION

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