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- EMDB-49564: cryoEM structure of human ACKR3 phosphorylated by GRK2 in complex... -

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Basic information

Entry
Database: EMDB / ID: EMD-49564
TitlecryoEM structure of human ACKR3 phosphorylated by GRK2 in complex with Arr2
Map data
Sample
  • Complex: Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3
Keywordscomplex / GPCR / arrestin / signaling / SIGNALING PROTEIN
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsChen Q / Tesmer JJG
Funding support United States, 10 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)CA254402 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM117372 United States
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI161880 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA221289 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA023168 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM137505 United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)HL071818 United States
National Institutes of Health/National Cancer Institute (NIH/NCI)CA023168 United States
Walther Cancer Foundation United States
Ralph W. and Grace M. Showalter Research Trust United States
CitationJournal: Nature / Year: 2025
Title: Effect of phosphorylation barcodes on arrestin binding to a chemokine receptor.
Authors: Qiuyan Chen / Christopher T Schafer / Somnath Mukherjee / Kai Wang / Martin Gustavsson / James R Fuller / Katelyn Tepper / Thomas D Lamme / Yasmin Aydin / Parth Agrawal / Genki Terashi / Xin- ...Authors: Qiuyan Chen / Christopher T Schafer / Somnath Mukherjee / Kai Wang / Martin Gustavsson / James R Fuller / Katelyn Tepper / Thomas D Lamme / Yasmin Aydin / Parth Agrawal / Genki Terashi / Xin-Qiu Yao / Daisuke Kihara / Anthony A Kossiakoff / Tracy M Handel / John J G Tesmer /
Abstract: Unique phosphorylation 'barcodes' installed in different regions of an active seven-transmembrane receptor by different G-protein-coupled receptor (GPCR) kinases (GRKs) have been proposed to promote ...Unique phosphorylation 'barcodes' installed in different regions of an active seven-transmembrane receptor by different G-protein-coupled receptor (GPCR) kinases (GRKs) have been proposed to promote distinct cellular outcomes, but it is unclear whether or how arrestins differentially engage these barcodes. Here, to address this, we developed an antigen-binding fragment (Fab7) that recognizes both active arrestin2 (β-arrestin1) and arrestin3 (β-arrestin2) without interacting with bound receptor polypeptides. We used Fab7 to determine the structures of both arrestins in complex with atypical chemokine receptor 3 (ACKR3) phosphorylated in different regions of its C-terminal tail by either GRK2 or GRK5 (ref. ). The GRK2-phosphorylated ACKR3 resulted in more heterogeneous 'tail-mode' assemblies, whereas phosphorylation by GRK5 resulted in more rigid 'ACKR3-adjacent' assemblies. Unexpectedly, the finger loops of both arrestins engaged the micelle surface rather than the receptor intracellular pocket, with arrestin3 being more dynamic, partly because of its lack of a membrane-anchoring motif. Thus, both the region of the barcode and the arrestin isoform involved can alter the structure and dynamics of GPCR-arrestin complexes, providing a possible mechanistic basis for unique downstream cellular effects, such as the efficiency of chemokine scavenging and the robustness of arrestin binding in ACKR3.
History
DepositionMar 4, 2025-
Header (metadata) releaseApr 2, 2025-
Map releaseApr 2, 2025-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_49564.png

Downloads & links

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Map

FileDownload / File: emd_49564.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
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AxesZ (Sec.)Y (Row.)X (Col.)
1.05 Å/pix.
x 360 pix.
= 379.44 Å		1.05 Å/pix.
x 360 pix.
= 379.44 Å		1.05 Å/pix.
x 360 pix.
= 379.44 Å

Surface

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Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.054 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.15
Minimum - Maximum-1.2557522 - 2.0952315
Average (Standard dev.)0.000004223693 (±0.016753724)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 379.44 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_49564_half_map_1.map
Projections & Slices
AxesZYX

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Density Histograms

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Histogram (log scale)

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Half map: #2

Fileemd_49564_half_map_2.map
Projections & Slices
AxesZYX

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Histogram

Histogram (log scale)

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Sample components

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Entire : Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3

EntireName: Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3
Components
  • Complex: Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3

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Supramolecule #1: Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3

SupramoleculeName: Human ACKR3 phosphorylated by GRK5 in complex with Arrestin3
type: complex / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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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

Concentration0.7 mg/mL
BufferpH: 8
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 56.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.6 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 398823
Initial angle assignmentType: COMMON LINE / Software - Name: cryoSPARC
Final angle assignmentType: COMMON LINE / Software - Name: cryoSPARC

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