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- EMDB-62586: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go -

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Entry
Database: EMDB / ID: EMD-62586
TitleStructure of mouse TLQP21 bound to mouse C3aR in complex with Go
Map data
Sample
  • Complex: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go
    • Protein or peptide: VGF-derived peptide TLQP-21
    • Protein or peptide: Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor
    • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
    • Protein or peptide: 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(O) subunit gamma-2
    • Protein or peptide: Antibody fragment - ScFv16
KeywordsG protein coupled receptor / G protein / Membrane protein / Immunite system / SIGNALING PROTEIN
Function / homology
Function and homology information


complement component C3a receptor activity / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / Post-translational protein phosphorylation / Regulation of Complement cascade / Peptide ligand-binding receptors / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / sexual reproduction / G alpha (i) signalling events / neuropeptide hormone activity ...complement component C3a receptor activity / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / Post-translational protein phosphorylation / Regulation of Complement cascade / Peptide ligand-binding receptors / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / sexual reproduction / G alpha (i) signalling events / neuropeptide hormone activity / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / mu-type opioid receptor binding / corticotropin-releasing hormone receptor 1 binding / vesicle docking involved in exocytosis / positive regulation of neutrophil chemotaxis / insulin secretion / G protein-coupled dopamine receptor signaling pathway / regulation of locomotion / positive regulation of macrophage chemotaxis / regulation of heart contraction / parallel fiber to Purkinje cell synapse / response to dietary excess / positive regulation of vascular endothelial growth factor production / response to cAMP / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / postsynaptic modulation of chemical synaptic transmission / ovarian follicle development / transport vesicle / Neutrophil degranulation / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / response to cold / muscle contraction / generation of precursor metabolites and energy / growth factor activity / locomotory behavior / calcium-mediated signaling / negative regulation of insulin secretion / response to insulin / G protein-coupled receptor activity / GABA-ergic synapse / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / Olfactory Signaling Pathway / Activation of the phototransduction cascade / chemotaxis / positive regulation of angiogenesis / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / G beta:gamma signalling through CDC42 / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / 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 / G-protein beta-subunit binding / glucose homeostasis / cellular response to prostaglandin E stimulus / heterotrimeric G-protein complex / Inactivation, recovery and regulation of the phototransduction cascade / G alpha (12/13) signalling events / extracellular vesicle / sensory perception of taste / Thrombin signalling through proteinase activated receptors (PARs) / signaling receptor complex adaptor activity / G protein activity / retina development in camera-type eye / presynaptic membrane / cell body / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / chemical synaptic transmission / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / postsynaptic membrane
Similarity search - Function
Neurosecretory protein VGF / C3a anaphylatoxin chemotactic receptor / Muscarinic acetylcholine receptor M4 / Anaphylatoxin chemotactic receptor, C3a/C5a1/C5a2 / Muscarinic acetylcholine receptor family / Formyl peptide receptor-related / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion ...Neurosecretory protein VGF / C3a anaphylatoxin chemotactic receptor / Muscarinic acetylcholine receptor M4 / Anaphylatoxin chemotactic receptor, C3a/C5a1/C5a2 / Muscarinic acetylcholine receptor family / Formyl peptide receptor-related / G-protein alpha subunit, group I / Serpentine type 7TM GPCR chemoreceptor Srsx / 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 / G protein beta WD-40 repeat protein / 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. / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
C3a anaphylatoxin chemotactic receptor / Muscarinic acetylcholine receptor M4 / 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 / Neurosecretory protein VGF
Similarity search - Component
Biological speciesHomo sapiens (human) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.88 Å
AuthorsBanerjee R / Yadav R / Yadav MK / Ganguly M / Mishra S / Dalal A / Gati C / Shukla AK
Funding support United Kingdom, India, 3 items
OrganizationGrant numberCountry
Wellcome TrustIA/S/20/1/504916 United Kingdom
Science and Engineering Research Board (SERB)IPA/2020/000405 India
Science and Engineering Research Board (SERB)CRG/2022/002646 India
CitationJournal: bioRxiv / Year: 2025
Title: Molecular fingerprints of a convergent mechanism orchestrating diverse ligand recognition and species-specific pharmacology at the complement anaphylatoxin receptors.
Authors: Sudha Mishra / Manish K Yadav / Annu Dalal / Manisankar Ganguly / Ravi Yadav / Kazuhiro Sawada / Divyanshu Tiwari / Nabarun Roy / Nilanjana Banerjee / Jenny N Fung / Jianina Marallag / ...Authors: Sudha Mishra / Manish K Yadav / Annu Dalal / Manisankar Ganguly / Ravi Yadav / Kazuhiro Sawada / Divyanshu Tiwari / Nabarun Roy / Nilanjana Banerjee / Jenny N Fung / Jianina Marallag / Cedric S Cui / Xaria X Li / John D Lee / Calvin Aaron Dsouza / Shirsha Saha / Parishmita Sarma / Ganita Rawat / Houming Zhu / Htet A Khant / Richard J Clark / Fumiya K Sano / Ramanuj Banerjee / Trent M Woodruff / Osamu Nureki / Cornelius Gati / Arun K Shukla /
Abstract: Complement anaphylatoxin receptors (C3aR and C5aR1) are prototypical G protein-coupled receptors (GPCRs) playing crucial physiological roles in innate immunity by combating pathogenic infections and ...Complement anaphylatoxin receptors (C3aR and C5aR1) are prototypical G protein-coupled receptors (GPCRs) playing crucial physiological roles in innate immunity by combating pathogenic infections and orchestrating inflammatory responses. They continue to be important therapeutic targets for multiple disorders including autoimmune diseases, acute and chronic inflammation, and allergy-related conditions. Recent structural coverage has provided important insights into their activation and signaling, however, confounding observations in the literature related to ligand efficacy and functional responses, especially in different model systems, present a major challenge for drug discovery efforts. Here, we systematically and comprehensively profile a broad set of natural and synthetic ligands at C3aR and C5aR1 and discover a previously unanticipated level of functional specialization in terms of species-specific pharmacology and receptor activation. Taking a lead from this, we determine seventeen cryo-EM structures of different ligand-receptor-G-protein complexes and uncover distinct orientation of agonists between the human and mouse receptors despite an overlapping positioning in the orthosteric binding pocket. Combined with extensive mutagenesis and functional assays, these structural snapshots allow us to decode and validate a convergent molecular mechanism involving a "Five-Point-Switch" in these receptors that orchestrates the recognition and efficacy of diverse agonists. We also identify species-specific differences at the level of phosphorylation patterns encoded in the carboxyl-terminus of these receptors and directly visualize their impact on βarr binding and activation using cryo-EM structures. Interestingly, we observe that βarrs engage with the mouse C5aR1 using a variation of previously discovered P-X-P-P phosphorylation motif via a "Sliding-Mechanism" and also exhibit distinct oligomeric state for the human vs. mouse receptors. Taken together, this study elucidates functional specialization at the complement anaphylatoxin receptors and underlying molecular mechanisms, offering a previously lacking framework with direct and immediate implications for the development of novel therapeutics.
History
DepositionDec 4, 2024-
Header (metadata) releaseNov 26, 2025-
Map releaseNov 26, 2025-
UpdateNov 26, 2025-
Current statusNov 26, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_62586.png

Downloads & links

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Map

FileDownload / File: emd_62586.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.29 Å/pix.
x 256 pix.
= 331.264 Å		1.29 Å/pix.
x 256 pix.
= 331.264 Å		1.29 Å/pix.
x 256 pix.
= 331.264 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.294 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0366
Minimum - Maximum-0.02790902 - 1.8841919
Average (Standard dev.)0.00049592514 (±0.01613494)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 331.264 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_62586_half_map_1.map
Projections & Slices
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Density Histograms

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Half map: #1

Fileemd_62586_half_map_2.map
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Sample components

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Entire : Structure of mouse TLQP21 bound to mouse C3aR in complex with Go

EntireName: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go
Components
  • Complex: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go
    • Protein or peptide: VGF-derived peptide TLQP-21
    • Protein or peptide: Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor
    • Protein or peptide: Guanine nucleotide-binding protein G(o) subunit alpha
    • Protein or peptide: 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(O) subunit gamma-2
    • Protein or peptide: Antibody fragment - ScFv16

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Supramolecule #1: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go

SupramoleculeName: Structure of mouse TLQP21 bound to mouse C3aR in complex with Go
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: VGF-derived peptide TLQP-21

MacromoleculeName: VGF-derived peptide TLQP-21 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 2.439801 KDa
SequenceString:
TLQPPASSRR RHFHHALPPA R

UniProtKB: Neurosecretory protein VGF

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Macromolecule #2: Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotacti...

MacromoleculeName: Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor
type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 59.526031 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGKTIIALSY IFCLVFADYK DDDDAANFTP VNGSSGNQSV RLVTSSSLEV LFQGPGSESF DADTNSTDLH SRPLFQPQDI ASMVILGLT CLLGLLGNGL VLWVAGVKMK TTVNTVWFLH LTLADFLCCL SLPFSLAHLI LQGHWPYGLF LCKLIPSIII L NMFASVFL ...String:
MGKTIIALSY IFCLVFADYK DDDDAANFTP VNGSSGNQSV RLVTSSSLEV LFQGPGSESF DADTNSTDLH SRPLFQPQDI ASMVILGLT CLLGLLGNGL VLWVAGVKMK TTVNTVWFLH LTLADFLCCL SLPFSLAHLI LQGHWPYGLF LCKLIPSIII L NMFASVFL LTAISLDRCL IVHKPIWCQN HRNVRTAFAI CGCVWVVAFV MCVPVFVYRD LFIMDNRSIC RYNFDSSRSY DY WDYVYKL SLPESNSTDN STAQLTGHMN DRSAPSSVQA RDYFWTVTTA LQSQPFLTSP EDSFSLDSAN QQPHYGGKPP NVL TAAVPS GFPVEDRKSN TLNADAFLSA HTELFPTASS GHLYPYDFQG DYVDQFTYDN HVPTPLMAIT ITRLVVGFLV PFFI MVICY SLIVFRMRKT NFTKSRNKTF RVAVAVVTVF FICWTPYHLV GVLLLITDPE SSLGEAVMSW DHMSIALASA NSCFN PFLY ALLGKDFRKK ARQSIKGILE AAFSEELTHS TNCTQDKASS KRNNMSTDV

UniProtKB: Muscarinic acetylcholine receptor M4, C3a anaphylatoxin chemotactic receptor

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

MacromoleculeName: Guanine nucleotide-binding protein G(o) subunit alpha / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
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 #4: 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: 4 / 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 #5: 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: 5 / 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 #6: Antibody fragment - ScFv16

MacromoleculeName: Antibody fragment - ScFv16 / type: protein_or_peptide / ID: 6 / 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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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 KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 46.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 0.8 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
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: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 2.88 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.6.2) / Number images used: 123131
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.6.2)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: cryoSPARC (ver. 4.6.2)
Final 3D classificationSoftware - Name: cryoSPARC (ver. 4.6.2)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelChain - Source name: SwissModel / Chain - Initial model type: in silico model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-9kv6:
Structure of mouse TLQP21 bound to mouse C3aR in complex with Go

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