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- EMDB-35294: C3a-C3aR-Go (C3a only, Original Map) -

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Basic information

Entry
Database: EMDB / ID: EMD-35294
TitleC3a-C3aR-Go (C3a only, Original Map)
Map dataFull map
Sample
  • Complex: C3a-C3aR-Go (C3a only, Original Map)
KeywordsGPCR / G protein / SIGNALING PROTEIN / SIGNALING PROTEIN-IMMUNE SYSTEM complex
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.55 Å
AuthorsYadav MK / Yadav R / Maharana J / Sarma P / Banerjee R / Shukla AK / Gati C
Funding support India, United Kingdom, 4 items
OrganizationGrant numberCountry
Department of Biotechnology (DBT, India)BT/PR29041/BRB/10/1697/2018 India
Wellcome TrustIA/S/20/1/504916 United Kingdom
Science and Engineering Research Board (SERB)SPR/2020/000408 India
Science and Engineering Research Board (SERB)IPA/2020/000405 India
CitationJournal: Cell / Year: 2023
Title: Molecular basis of anaphylatoxin binding, activation, and signaling bias at complement receptors.
Authors: Manish K Yadav / Jagannath Maharana / Ravi Yadav / Shirsha Saha / Parishmita Sarma / Chahat Soni / Vinay Singh / Sayantan Saha / Manisankar Ganguly / Xaria X Li / Samanwita Mohapatra / Sudha ...Authors: Manish K Yadav / Jagannath Maharana / Ravi Yadav / Shirsha Saha / Parishmita Sarma / Chahat Soni / Vinay Singh / Sayantan Saha / Manisankar Ganguly / Xaria X Li / Samanwita Mohapatra / Sudha Mishra / Htet A Khant / Mohamed Chami / Trent M Woodruff / Ramanuj Banerjee / Arun K Shukla / Cornelius Gati /
Abstract: The complement system is a critical part of our innate immune response, and the terminal products of this cascade, anaphylatoxins C3a and C5a, exert their physiological and pathophysiological ...The complement system is a critical part of our innate immune response, and the terminal products of this cascade, anaphylatoxins C3a and C5a, exert their physiological and pathophysiological responses primarily via two GPCRs, C3aR and C5aR1. However, the molecular mechanism of ligand recognition, activation, and signaling bias of these receptors remains mostly elusive. Here, we present nine cryo-EM structures of C3aR and C5aR1 activated by their natural and synthetic agonists, which reveal distinct binding pocket topologies of complement anaphylatoxins and provide key insights into receptor activation and transducer coupling. We also uncover the structural basis of a naturally occurring mechanism to dampen the inflammatory response of C5a via proteolytic cleavage of the terminal arginine and the G-protein signaling bias elicited by a peptide agonist of C3aR identified here. In summary, our study elucidates the innerworkings of the complement anaphylatoxin receptors and should facilitate structure-guided drug discovery to target these receptors in a spectrum of disorders.
History
DepositionFeb 7, 2023-
Header (metadata) releaseOct 18, 2023-
Map releaseOct 18, 2023-
UpdateNov 8, 2023-
Current statusNov 8, 2023Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_35294.png

Downloads & links

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Map

FileDownload / File: emd_35294.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFull map
Voxel sizeX=Y=Z: 1.0631 Å
Density
Contour LevelBy AUTHOR: 0.15
Minimum - Maximum-0.9515851 - 1.2850572
Average (Standard dev.)-0.000082336046 (±0.011180114)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 382.716 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half map B

Fileemd_35294_half_map_1.map
AnnotationHalf map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half map A

Fileemd_35294_half_map_2.map
AnnotationHalf map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : C3a-C3aR-Go (C3a only, Original Map)

EntireName: C3a-C3aR-Go (C3a only, Original Map)
Components
  • Complex: C3a-C3aR-Go (C3a only, Original Map)

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Supramolecule #1: C3a-C3aR-Go (C3a only, Original Map)

SupramoleculeName: C3a-C3aR-Go (C3a only, Original Map) / 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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS GLACIOS
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.8 µm
Image recordingFilm or detector model: FEI FALCON IV (4k x 4k) / Number real images: 20051 / Average electron dose: 50.0 e/Å2

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Image processing

Particle selectionNumber selected: 9449228
Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 4.55 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 418953
FSC plot (resolution estimation)

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