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- EMDB-33360: Structural insights into human brain gut peptide cholecystokinin ... -

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Basic information

Entry
Database: EMDB / ID: EMD-33360
TitleStructural insights into human brain gut peptide cholecystokinin receptors
Map data
Sample
  • Complex: cholecystokinin receptor1
    • Complex: cholecystokinin receptor1
      • Protein or peptide: Cholecystokinin receptor type A
    • Complex: Gs protein
      • Protein or peptide: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
      • 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
    • Complex: Nanobody35
      • Protein or peptide: Nanobody 35
  • Ligand: 2-[2-[[4-(4-chloranyl-2,5-dimethoxy-phenyl)-5-(2-cyclohexylethyl)-1,3-thiazol-2-yl]carbamoyl]-5,7-dimethyl-indol-1-yl]ethanoic acid
  • Ligand: water
Keywordsbrain gut peptide receptor Class A G-protein-coupled receptor / NEUROPEPTIDE
Function / homology
Function and homology information


cholecystokinin receptor activity / cholecystokinin signaling pathway / regulation of hormone secretion / forebrain development / peptide hormone binding / cellular response to hormone stimulus / axonogenesis / Peptide ligand-binding receptors / Olfactory Signaling Pathway / Activation of the phototransduction cascade ...cholecystokinin receptor activity / cholecystokinin signaling pathway / regulation of hormone secretion / forebrain development / peptide hormone binding / cellular response to hormone stimulus / axonogenesis / Peptide ligand-binding receptors / 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 / neuron migration / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / 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 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / 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) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / extracellular exosome / nucleoplasm / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
Cholecystokinin receptor type A / Cholecystokinin A receptor, N-terminal / Cholecystokinin A receptor, N-terminal domain superfamily / Cholecystokinin A receptor, N-terminal / Cholecystokinin receptor / Serpentine type 7TM GPCR chemoreceptor Srsx / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily ...Cholecystokinin receptor type A / Cholecystokinin A receptor, N-terminal / Cholecystokinin A receptor, N-terminal domain superfamily / Cholecystokinin A receptor, N-terminal / Cholecystokinin receptor / Serpentine type 7TM GPCR chemoreceptor Srsx / 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. / 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. / 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
Similarity search - Domain/homology
Cholecystokinin receptor type A / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsDing Y / Zhang H / Liao Y / Chen L / Ji S
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Cell Discov / Year: 2022
Title: Structural insights into human brain-gut peptide cholecystokinin receptors.
Authors: Yu Ding / Huibing Zhang / Yu-Ying Liao / Li-Nan Chen / Su-Yu Ji / Jiao Qin / Chunyou Mao / Dan-Dan Shen / Lin Lin / Hao Wang / Yan Zhang / Xiao-Ming Li /
Abstract: The intestinal hormone and neuromodulator cholecystokinin (CCK) receptors CCK1R and CCK2R act as a signaling hub in brain-gut axis, mediating digestion, emotion, and memory regulation. CCK receptors ...The intestinal hormone and neuromodulator cholecystokinin (CCK) receptors CCK1R and CCK2R act as a signaling hub in brain-gut axis, mediating digestion, emotion, and memory regulation. CCK receptors exhibit distinct preferences for ligands in different posttranslational modification (PTM) states. CCK1R couples to G and G, whereas CCK2R primarily couples to G. Here we report the cryo-electron microscopy (cryo-EM) structures of CCK1R-G signaling complexes liganded either by sulfated cholecystokinin octapeptide (CCK-8) or a CCK1R-selective small-molecule SR146131, and CCK2R-G complexes stabilized by either sulfated CCK-8 or a CCK2R-selective ligand gastrin-17. Our structures reveal a location-conserved yet charge-distinct pocket discriminating the effects of ligand PTM states on receptor subtype preference, the unique pocket topology underlying selectivity of SR146131 and gastrin-17, the conformational changes in receptor activation, and key residues contributing to G protein subtype specificity, providing multiple structural templates for drug design targeting the brain-gut axis.
History
DepositionMay 1, 2022-
Header (metadata) releaseJul 20, 2022-
Map releaseJul 20, 2022-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_33360.png

Downloads & links

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Map

FileDownload / File: emd_33360.map.gz / Format: CCP4 / Size: 27 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.01 Å/pix.
x 192 pix.
= 194.688 Å		1.01 Å/pix.
x 192 pix.
= 194.688 Å		1.01 Å/pix.
x 192 pix.
= 194.688 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.014 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.15920049 - 0.23423597
Average (Standard dev.)-0.00006114863 (±0.0066583306)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions192192192
Spacing192192192
CellA=B=C: 194.68802 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_33360_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_33360_half_map_2.map
Projections & Slices
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Sample components

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Entire : cholecystokinin receptor1

EntireName: cholecystokinin receptor1
Components
  • Complex: cholecystokinin receptor1
    • Complex: cholecystokinin receptor1
      • Protein or peptide: Cholecystokinin receptor type A
    • Complex: Gs protein
      • Protein or peptide: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
      • 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
    • Complex: Nanobody35
      • Protein or peptide: Nanobody 35
  • Ligand: 2-[2-[[4-(4-chloranyl-2,5-dimethoxy-phenyl)-5-(2-cyclohexylethyl)-1,3-thiazol-2-yl]carbamoyl]-5,7-dimethyl-indol-1-yl]ethanoic acid
  • Ligand: water

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Supramolecule #1: cholecystokinin receptor1

SupramoleculeName: cholecystokinin receptor1 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5 / Details: cholecystokinin receptor1, Gs protein, Nanobody35

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Supramolecule #2: cholecystokinin receptor1

SupramoleculeName: cholecystokinin receptor1 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #5
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Gs protein

SupramoleculeName: Gs protein / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #4: Nanobody35

SupramoleculeName: Nanobody35 / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #4

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Macromolecule #1: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit...

MacromoleculeName: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 44.284074 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGCLGNSKTE DQRNEEKAQR EANKKIEKQL QKDKQVYRAT HRLLLLGAGE SGKNTIVKQM RILHVNGFNG DSEKATKVQD IKNNLKEAI ETIVAAMSNL VPPVELANPE NQFRVDYILS VMNVPDFDFP PEFYEHAKAL WEDEGVRACY ERSNEYQLID C AQYFLDKI ...String:
MGCLGNSKTE DQRNEEKAQR EANKKIEKQL QKDKQVYRAT HRLLLLGAGE SGKNTIVKQM RILHVNGFNG DSEKATKVQD IKNNLKEAI ETIVAAMSNL VPPVELANPE NQFRVDYILS VMNVPDFDFP PEFYEHAKAL WEDEGVRACY ERSNEYQLID C AQYFLDKI DVIKQADYVP SDQDLLRCRV LTSGIFETKF QVDKVNFHMF DVGAQRDERR KWIQCFNDVT AIIFVVASSS YN MVIREDN QTNRLQAALK LFDSIWNNKW LRDTSVILFL NKQDLLAEKV LAGKSKIEDY FPEFARYTTP EDATPEPGED PRV TRAKYF IRDEFLRIST ASGDGRHYCY PHFTCAVDTE NIRRVFNDCR DIIQRMHLRQ YELL

UniProtKB: Isoform Gnas-2 of Guanine nucleotide-binding protein G(s) subunit alpha isoforms short

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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: 37.198656 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLVS ASQDGKLIIW DSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG HTGYLSCCRF LDDNQIVTSS G DTTCALWD ...String:
ELDQLRQEAE QLKNQIRDAR KACADATLSQ ITNNIDPVGR IQMRTRRTLR GHLAKIYAMH WGTDSRLLVS ASQDGKLIIW DSYTTNKVH AIPLRSSWVM TCAYAPSGNY VACGGLDNIC SIYNLKTREG NVRVSRELAG HTGYLSCCRF LDDNQIVTSS G DTTCALWD IETGQQTTTF TGHTGDVMSL SLAPDTRLFV SGACDASAKL WDVREGMCRQ TFTGHESDIN AICFFPNGNA FA TGSDDAT CRLFDLRADQ ELMTYSHDNI ICGITSVSFS KSGRLLLAGY DDFNCNVWDA LKADRAGVLA GHDNRVSCLG VTD DGMAVA TGSWDSFLKI WN

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: Nanobody 35

MacromoleculeName: Nanobody 35 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 13.711284 KDa
SequenceString:
QVQLQESGGG LVQPGGSLRL SCAASGFTFS NYKMNWVRQA PGKGLEWVSD ISQSGASISY TGSVKGRFTI SRDNAKNTLY LQMNSLKPE DTAVYYCARC PAPFTRDCFD VTSTTYAYRG QGTQVTV

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Macromolecule #5: Cholecystokinin receptor type A

MacromoleculeName: Cholecystokinin receptor type A / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 47.886062 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDVVDSLLVN GSNITPPCEL GLENETLFCL DQPRPSKEWQ PAVQILLYSL IFLLSVLGNT LVITVLIRNK RMRTVTNIFL LSLAVSDLM LCLFCMPFNL IPNLLKDFIF GSAVCKTTTY FMGTSVSVST FNLVAISLER YGAICKPLQS RVWQTKSHAL K VIAATWCL ...String:
MDVVDSLLVN GSNITPPCEL GLENETLFCL DQPRPSKEWQ PAVQILLYSL IFLLSVLGNT LVITVLIRNK RMRTVTNIFL LSLAVSDLM LCLFCMPFNL IPNLLKDFIF GSAVCKTTTY FMGTSVSVST FNLVAISLER YGAICKPLQS RVWQTKSHAL K VIAATWCL SFTIMTPYPI YSNLVPFTKN NNQTANMCRF LLPNDVMQQS WHTFLLLILF LIPGIVMMVA YGLISLELYQ GI KFEASQK KSAKERKPST TSSGKYEDSD GCYLQKTRPP RKLELRQLST GSSSRANRIR SNSSAANLMA KKRVIRMLIV IVV LFFLCW MPIFSANAWR AYDTASAERR LSGTPISFIL LLSYTSSCVN PIIYCFMNKR FRLGFMATFP CCPNPGPPGA RGEV GEEEE GGTTGASLSR FSYSHMSASV PPQ

UniProtKB: Cholecystokinin receptor type A

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Macromolecule #6: 2-[2-[[4-(4-chloranyl-2,5-dimethoxy-phenyl)-5-(2-cyclohexylethyl)...

MacromoleculeName: 2-[2-[[4-(4-chloranyl-2,5-dimethoxy-phenyl)-5-(2-cyclohexylethyl)-1,3-thiazol-2-yl]carbamoyl]-5,7-dimethyl-indol-1-yl]ethanoic acid
type: ligand / ID: 6 / Number of copies: 1 / Formula: IA1
Molecular weightTheoretical: 610.163 Da
Chemical component information

ChemComp-IA1:
2-[2-[[4-(4-chloranyl-2,5-dimethoxy-phenyl)-5-(2-cyclohexylethyl)-1,3-thiazol-2-yl]carbamoyl]-5,7-dimethyl-indol-1-yl]ethanoic acid

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Macromolecule #7: water

MacromoleculeName: water / type: ligand / ID: 7 / Number of copies: 1 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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 K2 QUANTUM (4k x 4k) / Average electron dose: 62.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 5.0 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

31456

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 606654
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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