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- EMDB-32137: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with... -

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Basic information

Entry
Database: EMDB / ID: EMD-32137
TitleCryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
Map dataCryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
Sample
  • Complex: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
    • Protein or peptide: Mas-related G-protein coupled receptor member X2
    • Protein or peptide: circular cortistatin-14
  • Ligand: CHOLESTEROL
KeywordsG Protein-Coupled Receptor / MEMBRANE PROTEIN
Function / homology
Function and homology information


mast cell secretagogue receptor activity / mast cell activation / neuropeptide hormone activity / sleep / neuropeptide binding / mast cell degranulation / positive regulation of cytokinesis / sensory perception of pain / regulation of cell migration / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway ...mast cell secretagogue receptor activity / mast cell activation / neuropeptide hormone activity / sleep / neuropeptide binding / mast cell degranulation / positive regulation of cytokinesis / sensory perception of pain / regulation of cell migration / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / Peptide ligand-binding receptors / G protein-coupled receptor binding / G protein-coupled receptor activity / G alpha (i) signalling events / chemical synaptic transmission / G protein-coupled receptor signaling pathway / synapse / extracellular space / extracellular region / membrane / plasma membrane
Similarity search - Function
Somatostatin / Somatostatin/Cortistatin, C-terminal / Somatostatin/Cortistatin family / Mas-related G protein-coupled receptor family / 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
Cortistatin / Mas-related G-protein coupled receptor member X2
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.97 Å
AuthorsLi Y / Yang F
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81773704, 92057121, 31900936, 31971195 China
CitationJournal: Nature / Year: 2021
Title: Structure, function and pharmacology of human itch receptor complexes.
Authors: Fan Yang / Lulu Guo / Yu Li / Guopeng Wang / Jia Wang / Chao Zhang / Guo-Xing Fang / Xu Chen / Lei Liu / Xu Yan / Qun Liu / Changxiu Qu / Yunfei Xu / Peng Xiao / Zhongliang Zhu / Zijian Li / ...Authors: Fan Yang / Lulu Guo / Yu Li / Guopeng Wang / Jia Wang / Chao Zhang / Guo-Xing Fang / Xu Chen / Lei Liu / Xu Yan / Qun Liu / Changxiu Qu / Yunfei Xu / Peng Xiao / Zhongliang Zhu / Zijian Li / Jiuyao Zhou / Xiao Yu / Ning Gao / Jin-Peng Sun /
Abstract: In the clades of animals that diverged from the bony fish, a group of Mas-related G-protein-coupled receptors (MRGPRs) evolved that have an active role in itch and allergic signals. As an MRGPR, ...In the clades of animals that diverged from the bony fish, a group of Mas-related G-protein-coupled receptors (MRGPRs) evolved that have an active role in itch and allergic signals. As an MRGPR, MRGPRX2 is known to sense basic secretagogues (agents that promote secretion) and is involved in itch signals and eliciting pseudoallergic reactions. MRGPRX2 has been targeted by drug development efforts to prevent the side effects induced by certain drugs or to treat allergic diseases. Here we report a set of cryo-electron microscopy structures of the MRGPRX2-G trimer in complex with polycationic compound 48/80 or with inflammatory peptides. The structures of the MRGPRX2-G complex exhibited shallow, solvent-exposed ligand-binding pockets. We identified key common structural features of MRGPRX2 and describe a consensus motif for peptidic allergens. Beneath the ligand-binding pocket, the unusual kink formation at transmembrane domain 6 (TM6) and the replacement of the general toggle switch from Trp to Gly (superscript annotations as per Ballesteros-Weinstein nomenclature) suggest a distinct activation process. We characterized the interfaces of MRGPRX2 and the G trimer, and mapped the residues associated with key single-nucleotide polymorphisms on both the ligand and G-protein interfaces of MRGPRX2. Collectively, our results provide a structural basis for the sensing of cationic allergens by MRGPRX2, potentially facilitating the rational design of therapies to prevent unwanted pseudoallergic reactions.
History
DepositionNov 4, 2021-
Header (metadata) releaseDec 1, 2021-
Map releaseDec 1, 2021-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.02
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.02
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  • Surface view with fitted model
  • Atomic models: PDB-7vv4
  • Surface level: 0.02
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_32137.png

Downloads & links

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Map

FileDownload / File: emd_32137.map.gz / Format: CCP4 / Size: 15.6 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 160 pix.
= 168.32 Å		1.05 Å/pix.
x 160 pix.
= 168.32 Å		1.05 Å/pix.
x 160 pix.
= 168.32 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.052 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.006 / Movie #1: 0.02
Minimum - Maximum-0.06582707 - 0.13587718
Average (Standard dev.)0.00013105282 (±0.002797562)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions160160160
Spacing160160160
CellA=B=C: 168.32 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.0521.0521.052
M x/y/z160160160
origin x/y/z0.0000.0000.000
length x/y/z168.320168.320168.320
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS160160160
D min/max/mean-0.0660.1360.000

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Supplemental data

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Sample components

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Entire : Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with...

EntireName: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
Components
  • Complex: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
    • Protein or peptide: Mas-related G-protein coupled receptor member X2
    • Protein or peptide: circular cortistatin-14
  • Ligand: CHOLESTEROL

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Supramolecule #1: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with...

SupramoleculeName: Cryo-EM structure of pseudoallergen receptor MRGPRX2 complex with linear cortistatin-14, local
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Mas-related G-protein coupled receptor member X2

MacromoleculeName: Mas-related G-protein coupled receptor member X2 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.123984 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MDPTTPAWGT ESTTVNGNDQ ALLLLCGKET LIPVFLILFI ALVGLVGNGF VLWLLGFRMR RNAFSVYVLS LAGADFLFLC FQIINCLVY LSNFFCSISI NFPSFFTTVM TCAYLAGLSM LSTVSTERCL SVLWPIWYRC RRPRHLSAVV CVLLWALSLL L SILEGKFC ...String:
MDPTTPAWGT ESTTVNGNDQ ALLLLCGKET LIPVFLILFI ALVGLVGNGF VLWLLGFRMR RNAFSVYVLS LAGADFLFLC FQIINCLVY LSNFFCSISI NFPSFFTTVM TCAYLAGLSM LSTVSTERCL SVLWPIWYRC RRPRHLSAVV CVLLWALSLL L SILEGKFC GFLFSDGDSG WCQTFDFITA AWLIFLFMVL CGSSLALLVR ILCGSRGLPL TRLYLTILLT VLVFLLCGLP FG IQWFLIL WIWKDSDVLF CHIHPVSVVL SSLNSSANPI IYFFVGSFRK QWRLQQPILK LALQRALQDI AEVDHSEGCF RQG TPEMSR SSLV

UniProtKB: Mas-related G-protein coupled receptor member X2

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Macromolecule #2: circular cortistatin-14

MacromoleculeName: circular cortistatin-14 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 1.726048 KDa
SequenceString:
PCKNFFWKTF SSCK

UniProtKB: Cortistatin

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Macromolecule #3: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 3 / Number of copies: 1 / Formula: CLR
Molecular weightTheoretical: 386.654 Da
Chemical component information

ChemComp-CLR:
CHOLESTEROL

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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 SUMMIT (4k x 4k) / Average electron dose: 58.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.97 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 303343
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION

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