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- PDB-8jgg: CryoEM structure of Gi-coupled MRGPRX1 with peptide agonist BAM8-22 -

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Entry
Database: PDB / ID: 8jgg
TitleCryoEM structure of Gi-coupled MRGPRX1 with peptide agonist BAM8-22
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • BAM8-22
  • Mas-related G-protein coupled receptor member X1
  • Single-Chain Fragment Variable 16
KeywordsSTRUCTURAL PROTEIN / itch receptor / Mas-related GPCRs / MRGPRX1
Function / homology
Function and homology information


synaptic vesicle lumen / response to chloroquine / chromaffin granule lumen / opioid peptide activity / aggressive behavior / general adaptation syndrome, behavioral process / positive regulation of behavioral fear response / symmetric synapse / synaptic signaling via neuropeptide / neuronal dense core vesicle lumen ...synaptic vesicle lumen / response to chloroquine / chromaffin granule lumen / opioid peptide activity / aggressive behavior / general adaptation syndrome, behavioral process / positive regulation of behavioral fear response / symmetric synapse / synaptic signaling via neuropeptide / neuronal dense core vesicle lumen / response to epinephrine / G protein-coupled opioid receptor signaling pathway / cell body fiber / cellular response to vitamin D / sensory perception / neuropeptide hormone activity / startle response / transmission of nerve impulse / locomotory exploration behavior / response to immobilization stress / neuropeptide signaling pathway / behavioral fear response / cellular response to transforming growth factor beta stimulus / glial cell proliferation / adenylate cyclase inhibitor activity / positive regulation of protein localization to cell cortex / T cell migration / Adenylate cyclase inhibitory pathway / D2 dopamine receptor binding / response to prostaglandin E / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / axon terminus / sensory perception of pain / cellular response to forskolin / regulation of mitotic spindle organization / Peptide ligand-binding receptors / cellular response to cAMP / acute-phase response / response to nicotine / Regulation of insulin secretion / Post-translational protein phosphorylation / positive regulation of cholesterol biosynthetic process / negative regulation of insulin secretion / G protein-coupled receptor activity / G protein-coupled receptor binding / response to calcium ion / response to peptide hormone / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / cellular response to virus / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / response to toxic substance / centriolar satellite / G-protein beta/gamma-subunit complex binding / 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 / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / 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 / osteoblast differentiation / 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 / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / transmembrane signaling receptor activity / 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 / response to estradiol / 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 / G protein activity
Similarity search - Function
Proenkephalin A / Opioid neuropeptide precursor / Vertebrate endogenous opioids neuropeptide / Endogenous opioids neuropeptides precursors signature. / Mas-related G protein-coupled receptor family / 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. ...Proenkephalin A / Opioid neuropeptide precursor / Vertebrate endogenous opioids neuropeptide / Endogenous opioids neuropeptides precursors signature. / Mas-related G protein-coupled receptor family / 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 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Proenkephalin-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 / Guanine nucleotide-binding protein G(i) subunit alpha-1 / Mas-related G-protein coupled receptor member X1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsSun, J.P. / Xu, H.E. / Ynag, F. / Liu, Z.M. / Guo, L.L. / Zhang, Y.M. / Fang, G.X. / Tie, L. / Zhuang, Y.M. / Xue, C.Y.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)91939301 China
National Natural Science Foundation of China (NSFC)32130022 China
CitationJournal: Nat Commun / Year: 2023
Title: Ligand recognition and G protein coupling of the human itch receptor MRGPRX1.
Authors: Lulu Guo / Yumu Zhang / Guoxing Fang / Lu Tie / Yuming Zhuang / Chenyang Xue / Qi Liu / Minghui Zhang / Kongkai Zhu / Chongzhao You / Peiyu Xu / Qingning Yuan / Chao Zhang / Lei Liu / ...Authors: Lulu Guo / Yumu Zhang / Guoxing Fang / Lu Tie / Yuming Zhuang / Chenyang Xue / Qi Liu / Minghui Zhang / Kongkai Zhu / Chongzhao You / Peiyu Xu / Qingning Yuan / Chao Zhang / Lei Liu / Naikang Rong / Shengxuan Peng / Yuan Liu / Chuanzheng Wang / Xin Luo / Zongyao Lv / Dongwei Kang / Xiao Yu / Cheng Zhang / Yi Jiang / Xinzhong Dong / Jiuyao Zhou / Zhongmin Liu / Fan Yang / H Eric Xu / Jin-Peng Sun /
Abstract: MRGPRX1, a Mas-related GPCR (MRGPR), is a key receptor for itch perception and targeting MRGPRX1 may have potential to treat both chronic itch and pain. Here we report cryo-EM structures of the ...MRGPRX1, a Mas-related GPCR (MRGPR), is a key receptor for itch perception and targeting MRGPRX1 may have potential to treat both chronic itch and pain. Here we report cryo-EM structures of the MRGPRX1-Gi1 and MRGPRX1-Gq trimers in complex with two peptide ligands, BAM8-22 and CNF-Tx2. These structures reveal a shallow orthosteric pocket and its conformational plasticity for sensing multiple different peptidic itch allergens. Distinct from MRGPRX2, MRGPRX1 contains a unique pocket feature at the extracellular ends of TM3 and TM4 to accommodate the peptide C-terminal "RF/RY" motif, which could serve as key mechanisms for peptidic allergen recognition. Below the ligand binding pocket, the GXPFGXF/W motif is essential for the inward tilting of the upper end of TM6 to induce receptor activation. Moreover, structural features inside the ligand pocket and on the cytoplasmic side of MRGPRX1 are identified as key elements for both Gi and Gq signaling. Collectively, our studies provide structural insights into understanding itch sensation, MRGPRX1 activation, and downstream G protein signaling.
History
DepositionMay 20, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 10, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 9, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
L: BAM8-22
S: Single-Chain Fragment Variable 16
A: Guanine nucleotide-binding protein G(i) subunit alpha-1
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
R: Mas-related G-protein coupled receptor member X1


Theoretical massNumber of molelcules
Total (without water)153,8546
Polymers153,8546
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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

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


Mass: 6633.625 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59768
#4: Protein Guanine nucleotide-binding protein G(i) subunit alpha-1 / Adenylate cyclase-inhibiting G alpha protein


Mass: 40415.031 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
#5: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 38561.152 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNB1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P62873

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

#2: Protein/peptide BAM8-22 / Met-enkephalin / Opioid growth factor / OGF


Mass: 1603.797 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) Homo sapiens (human) / References: UniProt: P01210
#3: Antibody Single-Chain Fragment Variable 16


Mass: 30363.043 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)
#6: Protein Mas-related G-protein coupled receptor member X1 / Sensory neuron-specific G-protein coupled receptor 3/4


Mass: 36276.906 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: MRGPRX1, MRGX1, SNSR3, SNSR4 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q96LB2

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Details

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: CryoEM structure of Gi-coupled MRGPRX1 with peptide agonist BAM8-22
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
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: FLOOD BEAM
Electron lensMode: DIFFRACTION / Nominal defocus max: 1200 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 924644 / Symmetry type: POINT

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