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- EMDB-41892: Structure of REGN7663-Fab bound CXCR4 -

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Basic information

Entry
Database: EMDB / ID: EMD-41892
TitleStructure of REGN7663-Fab bound CXCR4
Map data
Sample
  • Complex: REGN7663 Fab-bound CXCR4
    • Protein or peptide: REGN7663 Fab light chain
    • Protein or peptide: REGN7663 Fab heavy chain
    • Protein or peptide: C-X-C chemokine receptor type 4
  • Ligand: CHOLESTEROL
KeywordsGPCR / chemokine receptor / antibody / fab / SIGNALING PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


C-X-C motif chemokine 12 receptor activity / regulation of viral process / positive regulation of vascular wound healing / positive regulation of macrophage migration inhibitory factor signaling pathway / neuron recognition / telencephalon cell migration / positive regulation of mesenchymal stem cell migration / response to tacrolimus / response to ultrasound / Specification of primordial germ cells ...C-X-C motif chemokine 12 receptor activity / regulation of viral process / positive regulation of vascular wound healing / positive regulation of macrophage migration inhibitory factor signaling pathway / neuron recognition / telencephalon cell migration / positive regulation of mesenchymal stem cell migration / response to tacrolimus / response to ultrasound / Specification of primordial germ cells / CXCL12-activated CXCR4 signaling pathway / myosin light chain binding / myelin maintenance / C-X-C chemokine receptor activity / regulation of programmed cell death / positive regulation of vasculature development / endothelial tube morphogenesis / endothelial cell differentiation / Signaling by ROBO receptors / regulation of chemotaxis / positive regulation of dendrite extension / Formation of definitive endoderm / positive regulation of chemotaxis / C-C chemokine receptor activity / C-C chemokine binding / Chemokine receptors bind chemokines / anchoring junction / dendritic cell chemotaxis / epithelial cell development / cellular response to cytokine stimulus / cell leading edge / small molecule binding / detection of temperature stimulus involved in sensory perception of pain / regulation of calcium ion transport / positive regulation of oligodendrocyte differentiation / Binding and entry of HIV virion / regulation of cell adhesion / detection of mechanical stimulus involved in sensory perception of pain / coreceptor activity / cardiac muscle contraction / ubiquitin binding / response to activity / neurogenesis / cell chemotaxis / calcium-mediated signaling / neuron migration / G protein-coupled receptor activity / brain development / response to virus / late endosome / cellular response to xenobiotic stimulus / actin binding / positive regulation of cold-induced thermogenesis / virus receptor activity / positive regulation of cytosolic calcium ion concentration / cytoplasmic vesicle / G alpha (i) signalling events / lysosome / early endosome / response to hypoxia / positive regulation of cell migration / immune response / G protein-coupled receptor signaling pathway / inflammatory response / external side of plasma membrane / apoptotic process / ubiquitin protein ligase binding / cell surface / protein-containing complex / extracellular exosome / plasma membrane / cytoplasm
Similarity search - Function
CXC chemokine receptor 4 N-terminal domain / CXCR4 Chemokine receptor N terminal / CXC chemokine receptor 4/atypical chemokine receptor 2 / Chemokine 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
C-X-C chemokine receptor type 4
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsSaotome K / McGoldrick LL / Franklin MC
Funding support United States, 1 items
OrganizationGrant numberCountry
Not funded United States
Citation
Journal: Nat Struct Mol Biol / Year: 2025
Title: Structural insights into CXCR4 modulation and oligomerization.
Authors: Kei Saotome / Luke L McGoldrick / Jo-Hao Ho / Trudy F Ramlall / Sweta Shah / Michael J Moore / Jee Hae Kim / Raymond Leidich / William C Olson / Matthew C Franklin /
Abstract: Activation of the chemokine receptor CXCR4 by its chemokine ligand CXCL12 regulates diverse cellular processes. Previously reported crystal structures of CXCR4 revealed the architecture of an ...Activation of the chemokine receptor CXCR4 by its chemokine ligand CXCL12 regulates diverse cellular processes. Previously reported crystal structures of CXCR4 revealed the architecture of an inactive, homodimeric receptor. However, many structural aspects of CXCR4 remain poorly understood. Here, we use cryo-electron microscopy to investigate various modes of human CXCR4 regulation. CXCL12 activates CXCR4 by inserting its N terminus deep into the CXCR4 orthosteric pocket. The binding of US Food and Drug Administration-approved antagonist AMD3100 is stabilized by electrostatic interactions with acidic residues in the seven-transmembrane-helix bundle. A potent antibody blocker, REGN7663, binds across the extracellular face of CXCR4 and inserts its complementarity-determining region H3 loop into the orthosteric pocket. Trimeric and tetrameric structures of CXCR4 reveal modes of G-protein-coupled receptor oligomerization. We show that CXCR4 adopts distinct subunit conformations in trimeric and tetrameric assemblies, highlighting how oligomerization could allosterically regulate chemokine receptor function.
#1: Journal: Biorxiv / Year: 2024
Title: Structural insights into CXCR4 modulation and oligomerization
Authors: Saotome K / McGoldrick LL / Ho J / Ramlall T / Shah S / Moore MJ / Kim JH / Leidich R / Olson WC / Franklin MC
History
DepositionSep 11, 2023-
Header (metadata) releaseMar 13, 2024-
Map releaseMar 13, 2024-
UpdateFeb 26, 2025-
Current statusFeb 26, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_41892.png

Downloads & links

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Map

FileDownload / File: emd_41892.map.gz / Format: CCP4 / Size: 103 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 300 pix.
= 255. Å		0.85 Å/pix.
x 300 pix.
= 255. Å		0.85 Å/pix.
x 300 pix.
= 255. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.28
Minimum - Maximum-1.7408674 - 2.5619907
Average (Standard dev.)-0.00044538904 (±0.048798796)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 255.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_41892_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: #2

Fileemd_41892_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : REGN7663 Fab-bound CXCR4

EntireName: REGN7663 Fab-bound CXCR4
Components
  • Complex: REGN7663 Fab-bound CXCR4
    • Protein or peptide: REGN7663 Fab light chain
    • Protein or peptide: REGN7663 Fab heavy chain
    • Protein or peptide: C-X-C chemokine receptor type 4
  • Ligand: CHOLESTEROL

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Supramolecule #1: REGN7663 Fab-bound CXCR4

SupramoleculeName: REGN7663 Fab-bound CXCR4 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: REGN7663 Fab light chain

MacromoleculeName: REGN7663 Fab light chain / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 24.185904 KDa
Recombinant expressionOrganism: Cricetulus griseus (Chinese hamster)
SequenceString: DVVMTQSPLS LPVTLGQPAS ISCRSSQSLV YTDGNTYLNW FQQRPGQSPR RLIYKVSNRD SGVPDRFSGS GSGTDFTLKI SRVEAEDVG FYYCMQNTHW PLTFGGGTKV EIKRTVAAPS VFIFPPSDEQ LKSGTASVVC LLNNFYPREA KVQWKVDNAL Q SGNSQESV ...String:
DVVMTQSPLS LPVTLGQPAS ISCRSSQSLV YTDGNTYLNW FQQRPGQSPR RLIYKVSNRD SGVPDRFSGS GSGTDFTLKI SRVEAEDVG FYYCMQNTHW PLTFGGGTKV EIKRTVAAPS VFIFPPSDEQ LKSGTASVVC LLNNFYPREA KVQWKVDNAL Q SGNSQESV TEQDSKDSTY SLSSTLTLSK ADYEKHKVYA CEVTHQGLSS PVTKSFNRGE C

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Macromolecule #2: REGN7663 Fab heavy chain

MacromoleculeName: REGN7663 Fab heavy chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 25.799934 KDa
Recombinant expressionOrganism: Cricetulus griseus (Chinese hamster)
SequenceString: QVQLVQSGAE VKKPGASVKV SCKASGYTFT SYGISWVRQA PGQGIEWMGW ISTYNGNRNY AQKVQGRVTM TTDRSTSTAY MDLRSLRSD DTAVYYCARH GITGARNYYY HYGMDVWGQG TTVTVSSAST KGPSVFPLAP CSRSTSESTA ALGCLVKDYF P EPVTVSWN ...String:
QVQLVQSGAE VKKPGASVKV SCKASGYTFT SYGISWVRQA PGQGIEWMGW ISTYNGNRNY AQKVQGRVTM TTDRSTSTAY MDLRSLRSD DTAVYYCARH GITGARNYYY HYGMDVWGQG TTVTVSSAST KGPSVFPLAP CSRSTSESTA ALGCLVKDYF P EPVTVSWN SGALTSGVHT FPAVLQSSGL YSLSSVVTVP SSSLGTKTYT CNVDHKPSNT KVDKRVESKY GPPCPPCPAP PV

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Macromolecule #3: C-X-C chemokine receptor type 4

MacromoleculeName: C-X-C chemokine receptor type 4 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 71.063609 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MKTIIALSYI FCLVFAGAPE GISIYTSDNY TEEMGSGDYD SMKEPCFREE NANFNKIFLP TIYSIIFLTG IVGNGLVILV MGYQKKLRS MTDKYRLHLS VADLLFVITL PFWAVDAVAN WYFGNFLCKA VHVIYTVSLY SSVLILAFIS LDRYLAIVHA T NSQRPRKL ...String:
MKTIIALSYI FCLVFAGAPE GISIYTSDNY TEEMGSGDYD SMKEPCFREE NANFNKIFLP TIYSIIFLTG IVGNGLVILV MGYQKKLRS MTDKYRLHLS VADLLFVITL PFWAVDAVAN WYFGNFLCKA VHVIYTVSLY SSVLILAFIS LDRYLAIVHA T NSQRPRKL LAEKVVYVGV WIPALLLTIP DFIFANVSEA DDRYICDRFY PNDLWVVVFQ FQHIMVGLIL PGIVILSCYC II ISKLSHS KGHQKRKALK TTVILILAFF ACWLPYYIGI SIDSFILLEI IKQGCEFENT VHKWISITEA LAFFHCCLNP ILY AFLGAK FKTSAQHALT SVSRGSSLKI LSKGKRGGHS SVSTESESSS FHSSGRPLEV LFQGPGGGGS VSKGEELFTG VVPI LVELD GDVNGHKFSV SGEGEGDATY GKLTLKFICT TGKLPVPWPT LVTTLTYGVQ CFSRYPDHMK QHDFFKSAMP EGYVQ ERTI FFKDDGNYKT RAEVKFEGDT LVNRIELKGI DFKEDGNILG HKLEYNYNSH NVYIMADKQK NGIKVNFKIR HNIEDG SVQ LADHYQQNTP IGDGPVLLPD NHYLSTQSKL SKDPNEKRDH MVLLEFVTAA GITLGMDELY KDYKDDDDK

UniProtKB: C-X-C chemokine receptor type 4

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Macromolecule #4: CHOLESTEROL

MacromoleculeName: CHOLESTEROL / type: ligand / ID: 4 / 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

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 40.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.2 µm / Nominal defocus min: 1.2 µm
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: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 102810
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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