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- EMDB-24334: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bou... -

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Basic information

Entry
Database: EMDB / ID: EMD-24334
Titlecryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP
Map data
Sample
  • Complex: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP, trimeric G protein complex and stabilizing antibodies
    • Complex: Gastric inhibitory polypeptide GIP bound to GIP receptor GIPR
      • Protein or peptide: Gastric inhibitory polypeptide
      • Protein or peptide: Gastric inhibitory polypeptide receptor
    • Complex: Trimeric stimulatory G protein
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-3,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
    • Protein or peptide: Single-chain variable fragment 16
    • Protein or peptide: Nanobody 35
KeywordsClass B GPCR / glucagon-like peptide-1 receptor / G protein nucleotide exchange factor. / MEMBRANE PROTEIN
Function / homology
Function and homology information


gastric inhibitory polypeptide receptor binding / gastric inhibitory peptide receptor activity / glucagon family peptide binding / gastric inhibitory peptide signaling pathway / glucagon receptor binding / regulation of fatty acid biosynthetic process / desensitization of G protein-coupled receptor signaling pathway / endocrine pancreas development / Synthesis, secretion, and inactivation of Glucose-dependent Insulinotropic Polypeptide (GIP) / response to fatty acid ...gastric inhibitory polypeptide receptor binding / gastric inhibitory peptide receptor activity / glucagon family peptide binding / gastric inhibitory peptide signaling pathway / glucagon receptor binding / regulation of fatty acid biosynthetic process / desensitization of G protein-coupled receptor signaling pathway / endocrine pancreas development / Synthesis, secretion, and inactivation of Glucose-dependent Insulinotropic Polypeptide (GIP) / response to fatty acid / negative regulation of adenylate cyclase activity / G protein-coupled peptide receptor activity / GTP metabolic process / response to starvation / exploration behavior / peptide hormone binding / positive regulation of macroautophagy / PKA activation in glucagon signalling / developmental growth / hair follicle placode formation / D1 dopamine receptor binding / response to glucose / intracellular transport / vascular endothelial cell response to laminar fluid shear stress / response to axon injury / renal water homeostasis / activation of adenylate cyclase activity / Hedgehog 'off' state / Adenylate cyclase inhibitory pathway / adenylate cyclase-activating adrenergic receptor signaling pathway / sensory perception of pain / response to nutrient / cellular response to glucagon stimulus / regulation of insulin secretion / adenylate cyclase activator activity / trans-Golgi network membrane / adult locomotory behavior / generation of precursor metabolites and energy / negative regulation of inflammatory response to antigenic stimulus / G protein-coupled receptor binding / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / response to calcium ion / hormone activity / bone development / positive regulation of insulin secretion / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / platelet aggregation / G-protein beta/gamma-subunit complex binding / centriolar satellite / cognition / memory / 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 / adenylate cyclase-activating G protein-coupled 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 / GDP binding / 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 / sensory perception of smell / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / transmembrane signaling receptor activity / 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) / positive regulation of cold-induced thermogenesis / retina development in camera-type eye / G protein activity / positive regulation of cytosolic calcium ion concentration / GTPase binding / Ca2+ pathway / fibroblast proliferation
Similarity search - Function
Gastric inhibitory polypeptide / GPCR, family 2, gastric inhibitory polypeptide receptor / Glucagon/GIP/secretin/VIP / Peptide hormone / Glucagon / GIP / secretin / VIP family signature. / Glucagon like hormones / G-protein coupled receptors family 2 signature 1. / : / GPCR, family 2, extracellular hormone receptor domain / G-protein coupled receptors family 2 profile 1. ...Gastric inhibitory polypeptide / GPCR, family 2, gastric inhibitory polypeptide receptor / Glucagon/GIP/secretin/VIP / Peptide hormone / Glucagon / GIP / secretin / VIP family signature. / Glucagon like hormones / G-protein coupled receptors family 2 signature 1. / : / GPCR, family 2, extracellular hormone receptor domain / G-protein coupled receptors family 2 profile 1. / Domain present in hormone receptors / Hormone receptor domain / GPCR family 2, extracellular hormone receptor domain superfamily / G-protein coupled receptors family 2 signature 2. / GPCR, family 2, secretin-like, conserved site / GPCR, family 2, secretin-like / 7 transmembrane receptor (Secretin family) / GPCR, family 2-like / G-protein coupled receptors family 2 profile 2. / G-protein alpha subunit, group S / G-protein alpha subunit, group I / 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 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
Guanine nucleotide-binding protein G(i) subunit alpha-3 / Gastric inhibitory polypeptide / Gastric inhibitory polypeptide receptor / 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 / Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse) / Lama glama (llama)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.24 Å
AuthorsSun B / Kobilka BK
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Structural determinants of dual incretin receptor agonism by tirzepatide.
Authors: Bingfa Sun / Francis S Willard / Dan Feng / Jorge Alsina-Fernandez / Qi Chen / Michal Vieth / Joseph D Ho / Aaron D Showalter / Cynthia Stutsman / Liyun Ding / Todd M Suter / James D Dunbar ...Authors: Bingfa Sun / Francis S Willard / Dan Feng / Jorge Alsina-Fernandez / Qi Chen / Michal Vieth / Joseph D Ho / Aaron D Showalter / Cynthia Stutsman / Liyun Ding / Todd M Suter / James D Dunbar / John W Carpenter / Faiz Ahmad Mohammed / Eitaro Aihara / Robert A Brown / Ana B Bueno / Paul J Emmerson / Julie S Moyers / Tong Sun Kobilka / Matthew P Coghlan / Brian K Kobilka / Kyle W Sloop /
Abstract: SignificanceTirzepatide is a dual agonist of the glucose-dependent insulinotropic polypeptide receptor (GIPR) and the glucagon-like peptide-1 receptor (GLP-1R), which are incretin receptors that ...SignificanceTirzepatide is a dual agonist of the glucose-dependent insulinotropic polypeptide receptor (GIPR) and the glucagon-like peptide-1 receptor (GLP-1R), which are incretin receptors that regulate carbohydrate metabolism. This investigational agent has proven superior to selective GLP-1R agonists in clinical trials in subjects with type 2 diabetes mellitus. Intriguingly, although tirzepatide closely resembles native GIP in how it activates the GIPR, it differs markedly from GLP-1 in its activation of the GLP-1R, resulting in less agonist-induced receptor desensitization. We report how cryogenic electron microscopy and molecular dynamics simulations inform the structural basis for the unique pharmacology of tirzepatide. These studies reveal the extent to which fatty acid modification, combined with amino acid sequence, determines the mode of action of a multireceptor agonist.
History
DepositionJun 29, 2021-
Header (metadata) releaseApr 13, 2022-
Map releaseApr 13, 2022-
UpdateOct 30, 2024-
Current statusOct 30, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_24334.png

Downloads & links

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Map

FileDownload / File: emd_24334.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.65 Å/pix.
x 400 pix.
= 259.2 Å		0.65 Å/pix.
x 400 pix.
= 259.2 Å		0.65 Å/pix.
x 400 pix.
= 259.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.648 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.007
Minimum - Maximum-0.013229543 - 0.02729491
Average (Standard dev.)-0.0000045505462 (±0.0009829912)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 259.2 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bou...

EntireName: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP, trimeric G protein complex and stabilizing antibodies
Components
  • Complex: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP, trimeric G protein complex and stabilizing antibodies
    • Complex: Gastric inhibitory polypeptide GIP bound to GIP receptor GIPR
      • Protein or peptide: Gastric inhibitory polypeptide
      • Protein or peptide: Gastric inhibitory polypeptide receptor
    • Complex: Trimeric stimulatory G protein
      • Protein or peptide: Guanine nucleotide-binding protein G(i) subunit alpha-3,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
    • Protein or peptide: Single-chain variable fragment 16
    • Protein or peptide: Nanobody 35

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Supramolecule #1: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bou...

SupramoleculeName: cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP, trimeric G protein complex and stabilizing antibodies
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Molecular weightTheoretical: 150 KDa

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Supramolecule #2: Gastric inhibitory polypeptide GIP bound to GIP receptor GIPR

SupramoleculeName: Gastric inhibitory polypeptide GIP bound to GIP receptor GIPR
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #6-#7
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Trimeric stimulatory G protein

SupramoleculeName: Trimeric stimulatory G protein / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #1-#2, #4
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Guanine nucleotide-binding protein G(i) subunit alpha-3,Isoform G...

MacromoleculeName: Guanine nucleotide-binding protein G(i) subunit alpha-3,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: 43.385246 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG AGESGKSTIV KQMRILHVNG FNGDSEKATK VQDIKNNLKE AIETIVAAM SNLVPPVELA NPENQFRVDY ILSVMNVPDF DFPPEFYEHA KALWEDEGVR ACYERSNEYQ LIDCAQYFLD K IDVIKQAD ...String:
MGCTLSAEDK AAVERSKMIE KQLQKDKQVY RATHRLLLLG AGESGKSTIV KQMRILHVNG FNGDSEKATK VQDIKNNLKE AIETIVAAM SNLVPPVELA NPENQFRVDY ILSVMNVPDF DFPPEFYEHA KALWEDEGVR ACYERSNEYQ LIDCAQYFLD K IDVIKQAD YVPSDQDLLR CRVLTSGIFE TKFQVDKVNF HMFDVGGQRD ERRKWIQCFN DVTAIIFVVA SSSYNMVIRE DN QTNRLQE ALNLFKSIWN NRWLRTISVI LFLNKQDLLA EKVLAGKSKI EDYFPEFARY TTPEDATPEP GEDPRVTRAK YFI RDEFLR ISTASGDGRH YCYPHFTCAV DTENIRRVFN DCRDIIQRMH LRQYELL

UniProtKB: Guanine nucleotide-binding protein G(i) subunit alpha-3, 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: 38.534062 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
SequenceString: MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV ...String:
MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV TSSGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD IN AICFFPN GNAFATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAG HDNRVS CLGVTDDGMA VATGSWDSFL KIWN

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

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Macromolecule #3: Single-chain variable fragment 16

MacromoleculeName: Single-chain variable fragment 16 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 31.870629 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 AAHHHHHHHH

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Macromolecule #4: 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: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Trichoplusia ni (cabbage looper)
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 #5: Nanobody 35

MacromoleculeName: Nanobody 35 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Lama glama (llama)
Molecular weightTheoretical: 17.352498 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MKYLLPTAAA GLLLLAAQPA MAQVQLQESG GGLVQPGGSL RLSCAASGFT FSNYKMNWVR QAPGKGLEWV SDISQSGASI SYTGSVKGR FTISRDNAKN TLYLQMNSLK PEDTAVYYCA RCPAPFTRDC FDVTSTTYAY RGQGTQVTVS SHHHHHHEPE A

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Macromolecule #6: Gastric inhibitory polypeptide

MacromoleculeName: Gastric inhibitory polypeptide / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 4.990586 KDa
SequenceString:
YAEGTFISDY SIAMDKIHQQ DFVNWLLAQK GKKNDWKHNI TQ

UniProtKB: Gastric inhibitory polypeptide

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Macromolecule #7: Gastric inhibitory polypeptide receptor

MacromoleculeName: Gastric inhibitory polypeptide receptor / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 52.871801 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: DYKDDDDAAA LEVLFQGPRA ETGSKGQTAG ELYQRWERYR RECQETLAAA EPPSGLACNG SFDMYVCWDY AAPNATARAS CPWYLPWHH HVAAGFVLRQ CGSDGQWGLW RDHTQCENPE KNEAFLDQRL ILERLQVMYT VGYSLSLATL LLALLILSLF R RLHCTRNY ...String:
DYKDDDDAAA LEVLFQGPRA ETGSKGQTAG ELYQRWERYR RECQETLAAA EPPSGLACNG SFDMYVCWDY AAPNATARAS CPWYLPWHH HVAAGFVLRQ CGSDGQWGLW RDHTQCENPE KNEAFLDQRL ILERLQVMYT VGYSLSLATL LLALLILSLF R RLHCTRNY IHINLFTSFM LRAAAILSRD RLLPRPGPYL GDQALALWNQ ALAACRTAQI VTQYCVGANY TWLLVEGVYL HS LLVLVGG SEEGHFRYYL LLGWGAPALF VIPWVIVRYL YENTQCWERN EVKAIWWIIR TPILMTILIN FLIFIRILGI LLS KLRTRQ MRCRDYRLRL ARSTLTLVPL LGVHEVVFAP VTEEQARGAL RFAKLGFEIF LSSFQGFLVS VLYCFINKEV QSEI RRGWH HCRLRRSLGE EQRQLPERAF RALPSGSGPG EVPTSRGLSS GTLPGPGNEA SRELESYC

UniProtKB: Gastric inhibitory polypeptide receptor

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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

Concentration10 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Name: GIF Quantum LS / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Detector mode: COUNTING / Average exposure time: 1.5 sec. / Average electron dose: 53.6 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
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: EMDB MAP
EMDB ID:

8653

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0) / Number images used: 145195
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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Atomic model buiding 1

Initial modelPDB ID:

6vcb


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementProtocol: FLEXIBLE FIT
Output model

PDB-7ra3:
cryo-EM of human Gastric inhibitory polypeptide receptor GIPR bound to GIP

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