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- EMDB-68520: C5a bound C5aR1(V2R C tail) in complex with beta-arrestin1 (Focus... -

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Basic information

Entry
Database: EMDB / ID: EMD-68520
TitleC5a bound C5aR1(V2R C tail) in complex with beta-arrestin1 (Focus on Receptor)
Map data
Sample
  • Complex: C5a anaphylatoxin chemotactic receptor 2
KeywordsC5aR2 / GPCR / membrane protein / active / arrestin / C5a
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsQin J / Cai C / Shan M / Zhang Y
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Cell Res / Year: 2026
Title: Atypical signaling, ligand recognition and selective agonist discovery of complement receptor C5aR2.
Authors: Jiao Qin / Chenxi Cai / Mayu Shan / Suqing Zhou / Qingya Shen / Tianyi Zhu / Mingming Zhao / Yang Mei / Fanghan Ji / Dan-Dan Shen / Shao-Kun Zang / Huibing Zhang / Haomang Xu / Ming Yang / ...Authors: Jiao Qin / Chenxi Cai / Mayu Shan / Suqing Zhou / Qingya Shen / Tianyi Zhu / Mingming Zhao / Yang Mei / Fanghan Ji / Dan-Dan Shen / Shao-Kun Zang / Huibing Zhang / Haomang Xu / Ming Yang / Wei-Wei Wang / Rong Xiao / Bing Yang / Chunyou Mao / Zhenhua Shao / Haijing Wu / Qianjin Lu / Yan Zhang /
Abstract: C5a, the most potent anaphylatoxin in the complement system, exerts its effects through the canonical G protein-coupled receptor C5aR1 and the arrestin-coupled receptor C5aR2. Despite the critical ...C5a, the most potent anaphylatoxin in the complement system, exerts its effects through the canonical G protein-coupled receptor C5aR1 and the arrestin-coupled receptor C5aR2. Despite the critical role of C5aR2 in immunomodulation, the molecular mechanisms underlying its biased signaling, ligand recognition, and associated pathophysiology remain poorly understood. Here, we report cryo-electron microscopy structures of β-arrestin 1-bound C5aR2 and C5aR1 stimulated by C5a or its metabolite C5a. By combining structural analysis with functional assays, we identified the key structural determinants that prevent G protein coupling and confer intrinsic bias toward β-arrestins. Comparative analysis elucidated the distinct ligand recognition mechanism of C5aR2 and explained the retained affinity of C5a for C5aR2. These findings guided the rational design of ZQ105, a highly selective C5aR2 agonist. Leveraging ZQ105 as a chemical probe, functional studies revealed that selective C5aR2 activation induces distinct pro-inflammatory responses and receptor internalization in neutrophils. This study provides novel structural insights into transducer engagement and ligand recognition by C5aR2, yielding a valuable pharmacological tool for exploring C5aR2-related pathophysiological processes.
History
DepositionJan 17, 2026-
Header (metadata) releaseJul 22, 2026-
Map releaseJul 22, 2026-
UpdateJul 22, 2026-
Current statusJul 22, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_68520.png

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Map

FileReleased
Projections & slices

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Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.93 Å/pix.
x 320 pix.
= 297.6 Å		0.93 Å/pix.
x 320 pix.
= 297.6 Å		0.93 Å/pix.
x 320 pix.
= 297.6 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.93 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.3
Minimum - Maximum-1.3151429 - 1.7239454
Average (Standard dev.)-0.0015711404 (±0.025768416)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 297.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_68520_half_map_1.map
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_68520_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 : C5a anaphylatoxin chemotactic receptor 2

EntireName: C5a anaphylatoxin chemotactic receptor 2
Components
  • Complex: C5a anaphylatoxin chemotactic receptor 2

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Supramolecule #1: C5a anaphylatoxin chemotactic receptor 2

SupramoleculeName: C5a anaphylatoxin chemotactic receptor 2 / 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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 52.0 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 / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.7000000000000001 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 129371
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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