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- EMDB-35275: Structure of C3a-C3aR-Go complex (Composite map) -

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Entry
Database: EMDB / ID: EMD-35275
TitleStructure of C3a-C3aR-Go complex (Composite map)
Map data
Sample
  • Complex: Structure of C3a-C3aR-Go complex
    • Complex: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Complex: Guanine nucleotide-binding protein G(o) subunit alpha
      • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
    • Complex: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Complex: Antibody fragment - ScFv16
      • Protein or peptide: Antibody fragment - ScFv16
    • Complex: C3a anaphylatoxin chemotactic receptor
      • Protein or peptide: C3a anaphylatoxin chemotactic receptor
    • Complex: C3a Ligand
      • Protein or peptide: C3a anaphylatoxin
KeywordsGPCR / G protein / SIGNALING PROTEIN-IMMUNE SYSTEM complex
Function / homology
Function and homology information


complement component C3a receptor activity / complement component C5a receptor activity / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / positive regulation of activation of membrane attack complex / vertebrate eye-specific patterning / positive regulation of apoptotic cell clearance / complement-mediated synapse pruning / Alternative complement activation ...complement component C3a receptor activity / complement component C5a receptor activity / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / positive regulation of activation of membrane attack complex / vertebrate eye-specific patterning / positive regulation of apoptotic cell clearance / complement-mediated synapse pruning / Alternative complement activation / Activation of C3 and C5 / positive regulation of phagocytosis, engulfment / positive regulation of lipid storage / positive regulation of G protein-coupled receptor signaling pathway / mu-type opioid receptor binding / complement receptor mediated signaling pathway / positive regulation of type IIa hypersensitivity / corticotropin-releasing hormone receptor 1 binding / complement-dependent cytotoxicity / positive regulation of D-glucose transmembrane transport / complement activation / complement activation, alternative pathway / vesicle docking involved in exocytosis / positive regulation of neutrophil chemotaxis / blood circulation / azurophil granule membrane / G protein-coupled dopamine receptor signaling pathway / endopeptidase inhibitor activity / neuron remodeling / regulation of heart contraction / parallel fiber to Purkinje cell synapse / positive regulation of macrophage chemotaxis / amyloid-beta clearance / B cell activation / positive regulation of vascular endothelial growth factor production / complement activation, classical pathway / postsynaptic modulation of chemical synaptic transmission / negative regulation of insulin secretion / Purinergic signaling in leishmaniasis infection / specific granule membrane / G protein-coupled serotonin receptor binding / adenylate cyclase regulator activity / adenylate cyclase-inhibiting serotonin receptor signaling pathway / muscle contraction / Peptide ligand-binding receptors / Regulation of Complement cascade / fatty acid metabolic process / GABA-ergic synapse / locomotory behavior / Post-translational protein phosphorylation / response to bacterium / calcium-mediated signaling / G protein-coupled receptor activity / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / positive regulation of receptor-mediated endocytosis / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / positive regulation of angiogenesis / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / Sensory perception of sweet, bitter, and umami (glutamate) taste / photoreceptor disc membrane / chemotaxis / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / azurophil granule lumen / cellular response to catecholamine stimulus / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / presynaptic membrane
Similarity search - Function
C3a anaphylatoxin chemotactic receptor / Anaphylatoxin chemotactic receptor, C3a/C5a1/C5a2 / Complement C3-like, NTR domain / : / : / Complement component 3, CUB domain, second segment / Complement component 3, CUB domain, first segment / Formyl peptide receptor-related / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. ...C3a anaphylatoxin chemotactic receptor / Anaphylatoxin chemotactic receptor, C3a/C5a1/C5a2 / Complement C3-like, NTR domain / : / : / Complement component 3, CUB domain, second segment / Complement component 3, CUB domain, first segment / Formyl peptide receptor-related / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. / Complement C3/4/5, macroglobulin domain MG1 / Macroglobulin domain MG1 / Anaphylatoxin, complement system domain / : / Anaphylatoxin domain signature. / Alpha-macro-globulin thiol-ester bond-forming region / Anaphylatoxin, complement system / Anaphylatoxin/fibulin / Anaphylotoxin-like domain / Anaphylatoxin domain profile. / Anaphylatoxin homologous domain / Netrin C-terminal Domain / Netrin module, non-TIMP type / UNC-6/NTR/C345C module / Macroglobulin domain MG4 / Macroglobulin domain MG4 / Netrin domain / NTR domain profile. / Alpha-macroglobulin, receptor-binding / Alpha-macroglobulin, receptor-binding domain superfamily / Macroglobulin domain MG3 / : / A-macroglobulin receptor binding domain / Macroglobulin domain MG3 / A-macroglobulin receptor / Tissue inhibitor of metalloproteinases-like, OB-fold / Alpha-2-macroglobulin / Macroglobulin domain / Alpha-2-macroglobulin, bait region domain / Alpha-macroglobulin-like, TED domain / Alpha-2-macroglobulin family / MG2 domain / A-macroglobulin TED domain / Alpha-2-macroglobulin bait region domain / Alpha-2-Macroglobulin / Alpha-2-macroglobulin family / Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid / G-protein alpha subunit, group I / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / 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) / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / WD domain, G-beta repeat / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / Immunoglobulin-like fold / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Complement C3 / Guanine nucleotide-binding protein G(o) subunit alpha / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / C3a anaphylatoxin chemotactic receptor
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.18 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-
UpdateOct 23, 2024-
Current statusOct 23, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_35275.png

Downloads & links

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Map

FileDownload / File: emd_35275.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.)
1.06 Å/pix.
x 360 pix.
= 382.716 Å		1.06 Å/pix.
x 360 pix.
= 382.716 Å		1.06 Å/pix.
x 360 pix.
= 382.716 Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0631 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.22
Minimum - Maximum-0.37903067 - 2.8006372
Average (Standard dev.)0.0052768784 (±0.026161024)
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: #2

Fileemd_35275_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: #1

Fileemd_35275_half_map_2.map
Projections & Slices
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Histogram (log scale)

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Sample components

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Entire : Structure of C3a-C3aR-Go complex

EntireName: Structure of C3a-C3aR-Go complex
Components
  • Complex: Structure of C3a-C3aR-Go complex
    • Complex: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Complex: Guanine nucleotide-binding protein G(o) subunit alpha
      • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
    • Complex: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
      • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
    • Complex: Antibody fragment - ScFv16
      • Protein or peptide: Antibody fragment - ScFv16
    • Complex: C3a anaphylatoxin chemotactic receptor
      • Protein or peptide: C3a anaphylatoxin chemotactic receptor
    • Complex: C3a Ligand
      • Protein or peptide: C3a anaphylatoxin

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Supramolecule #1: Structure of C3a-C3aR-Go complex

SupramoleculeName: Structure of C3a-C3aR-Go complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

SupramoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Guanine nucleotide-binding protein G(o) subunit alpha

SupramoleculeName: Guanine nucleotide-binding protein G(o) subunit alpha / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

SupramoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: complex / ID: 4 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #5: Antibody fragment - ScFv16

SupramoleculeName: Antibody fragment - ScFv16 / type: complex / ID: 5 / Parent: 1 / Macromolecule list: #4
Source (natural)Organism: Mus musculus (house mouse)

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Supramolecule #6: C3a anaphylatoxin chemotactic receptor

SupramoleculeName: C3a anaphylatoxin chemotactic receptor / type: complex / ID: 6 / Parent: 1 / Macromolecule list: #5
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #7: C3a Ligand

SupramoleculeName: C3a Ligand / type: complex / ID: 7 / Parent: 1 / Macromolecule list: #6
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.534062 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV ...String:
MHHHHHHGSS GSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKL IIWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC R FLDDNQIV TSSGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD IN AICFFPN GNAFATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAG HDNRVS CLGVTDDGMA VATGSWDSFL KIWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #2: Guanine nucleotide-binding protein G(o) subunit alpha

MacromoleculeName: Guanine nucleotide-binding protein G(o) subunit alpha / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 28.193939 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MGHHHHHHEN LYFQGTLSAE ERAALERSKA IEKNLKEDGI SAAKDVKLLL LGADNSGKST IVKQMKIIHG GSGGSGGTTG IVETHFTFK NLHFRLFDVG GQRSERKKWI HCFEDVTAII FCVDLSDYDQ VLHEDETTNR MHESLMLFDS ICNNKFFIDT S IILFLNKK ...String:
MGHHHHHHEN LYFQGTLSAE ERAALERSKA IEKNLKEDGI SAAKDVKLLL LGADNSGKST IVKQMKIIHG GSGGSGGTTG IVETHFTFK NLHFRLFDVG GQRSERKKWI HCFEDVTAII FCVDLSDYDQ VLHEDETTNR MHESLMLFDS ICNNKFFIDT S IILFLNKK DLFGEKIKKS PLTICFPEYT GPNTYEDAAA YIQAQFESKN RSPNKEIYCH MTCATDTNNA QVIFDAVTDI II ANNLRGC GLY

UniProtKB: Guanine nucleotide-binding protein G(o) subunit alpha, Guanine nucleotide-binding protein G(o) subunit alpha

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.861143 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString:
MASNNTASIA QARKLVEQLK MEANIDRIKV SKAAADLMAY CEAHAKEDPL LTPVPASENP FREKKFFCAI L

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #4: Antibody fragment - ScFv16

MacromoleculeName: Antibody fragment - ScFv16 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 26.466486 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS ...String:
DVQLVESGGG LVQPGGSRKL SCSASGFAFS SFGMHWVRQA PEKGLEWVAY ISSGSGTIYY ADTVKGRFTI SRDDPKNTLF LQMTSLRSE DTAMYYCVRS IYYYGSSPFD FWGQGTTLTV SSGGGGSGGG GSGGGGSDIV MTQATSSVPV TPGESVSISC R SSKSLLHS NGNTYLYWFL QRPGQSPQLL IYRMSNLASG VPDRFSGSGS GTAFTLTISR LEAEDVGVYY CMQHLEYPLT FG AGTKLEL K

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Macromolecule #5: C3a anaphylatoxin chemotactic receptor

MacromoleculeName: C3a anaphylatoxin chemotactic receptor / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 59.808422 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGKTIIALSY IFCLVFADYK DDDDAANFTP VNGSSGNQSV RLVTSSSLEV LFQGPGSASF SAETNSTDLL SQPWNEPPVI LSMVILSLT FLLGLPGNGL VLWVAGLKMQ RTVNTIWFLH LTLADLLCCL SLPFSLAHLA LQGQWPYGRF LCKLIPSIIV L NMFASVFL ...String:
MGKTIIALSY IFCLVFADYK DDDDAANFTP VNGSSGNQSV RLVTSSSLEV LFQGPGSASF SAETNSTDLL SQPWNEPPVI LSMVILSLT FLLGLPGNGL VLWVAGLKMQ RTVNTIWFLH LTLADLLCCL SLPFSLAHLA LQGQWPYGRF LCKLIPSIIV L NMFASVFL LTAISLDRCL VVFKPIWCQN HRNVGMACSI CGCIWVVAFV MCIPVFVYRE IFTTDNHNRC GYKFGLSSSL DY PDFYGDP LENRSLENIV QPPGEMNDRL DPSSFQTNDH PWTVPTVFQP QTFQRPSADS LPRGSARLTS QNLYSNVFKP ADV VSPKIP SGFPIEDHET SPLDNSDAFL STHLKLFPSA SSNSFYESEL PQGFQDYYNL GQFTDDDQVP TPLVAITITR LVVG FLLPS VIMIACYSFI VFRMQRGRFA KSQSKTFRVA VVVVAVFLVC WTPYHIFGVL SLLTDPETPL GKTLMSWDHV CIALA SANS CFNPFLYALL GKDFRKKARQ SIQGILEAAF SEELTRSTHC PSNNVISERN STTV

UniProtKB: C3a anaphylatoxin chemotactic receptor

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Macromolecule #6: C3a anaphylatoxin

MacromoleculeName: C3a anaphylatoxin / type: protein_or_peptide / ID: 6 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 9.114731 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
SVQLTEKRMD KVGKYPKELR KCCEDGMREN PMRFSCQRRT RFISLGEACK KVFLDCCNYI TELRRQHARA SHLGLAR

UniProtKB: Complement C3

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

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Image processing

Particle selectionNumber selected: 9449228
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

8i95

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4) / Number images used: 418953
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final 3D classificationSoftware - Name: cryoSPARC (ver. 4)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

8i95


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-8i9l:
Structure of C3a-C3aR-Go complex (Composite map)

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