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- PDB-9kzk: Structure of mouse C3a bound mouse C3aR in complex with Go -

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Entry
Database: PDB / ID: 9kzk
TitleStructure of mouse C3a bound mouse C3aR in complex with Go
Components
  • (Guanine nucleotide-binding protein ...) x 3
  • Antibody fragment - ScFv16
  • C3a anaphylatoxin
  • Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor
KeywordsSIGNALING PROTEIN / GPCR / G protein / beta-arrestin
Function / homology
Function and homology information


Alternative complement activation / Activation of C3 and C5 / 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 / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process ...Alternative complement activation / Activation of C3 and C5 / 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 / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / positive regulation of activation of membrane attack complex / Muscarinic acetylcholine receptors / G protein-coupled acetylcholine receptor activity / vertebrate eye-specific patterning / positive regulation of apoptotic cell clearance / complement-mediated synapse pruning / G alpha (i) signalling events / positive regulation of phagocytosis, engulfment / positive regulation of lipid storage / positive regulation of G protein-coupled receptor signaling pathway / positive regulation of type IIa hypersensitivity / adenylate cyclase-inhibiting G protein-coupled acetylcholine receptor signaling pathway / mu-type opioid receptor binding / complement receptor mediated signaling pathway / 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 / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / endopeptidase inhibitor activity / G protein-coupled dopamine receptor signaling pathway / neuron remodeling / regulation of locomotion / positive regulation of macrophage chemotaxis / regulation of heart contraction / parallel fiber to Purkinje cell synapse / amyloid-beta clearance / B cell activation / positive regulation of vascular endothelial growth factor production / complement activation, classical pathway / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / postsynaptic modulation of chemical synaptic transmission / Neutrophil degranulation / adenylate cyclase regulator activity / G protein-coupled serotonin receptor binding / adenylate cyclase-inhibiting serotonin receptor signaling pathway / positive regulation of phagocytosis / muscle contraction / response to bacterium / locomotory behavior / calcium-mediated signaling / fatty acid metabolic process / negative regulation of insulin secretion / G protein-coupled receptor activity / positive regulation of receptor-mediated endocytosis / 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 / positive regulation of protein phosphorylation / 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 / 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
Similarity search - Function
C3a anaphylatoxin chemotactic receptor / Muscarinic acetylcholine receptor M4 / 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 / Muscarinic acetylcholine receptor family / Formyl peptide receptor-related ...C3a anaphylatoxin chemotactic receptor / Muscarinic acetylcholine receptor M4 / 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 / Muscarinic acetylcholine receptor family / Formyl peptide receptor-related / Complement C3/4/5, macroglobulin domain MG1 / Macroglobulin domain MG1 / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. / Anaphylatoxin, complement system domain / : / Alpha-macro-globulin thiol-ester bond-forming region / Anaphylatoxin domain signature. / 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 / Alpha-macroglobulin, receptor-binding / Alpha-macroglobulin, receptor-binding domain superfamily / Macroglobulin domain MG3 / : / A-macroglobulin receptor binding domain / Macroglobulin domain MG3 / A-macroglobulin receptor / Netrin domain / NTR domain profile. / Alpha-2-macroglobulin / Macroglobulin domain / Tissue inhibitor of metalloproteinases-like, OB-fold / 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 / 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. / 7 transmembrane receptor (rhodopsin family) / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 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 / Immunoglobulin-like fold / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
C3a anaphylatoxin chemotactic receptor / Complement C3 / 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
Similarity search - Component
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.54 Å
AuthorsBanerjee, R. / Yadav, R. / Yadav, M.K. / Ganguly, M. / Mishra, S. / Dalal, A. / Gati, C. / Shukla, A.K.
Funding support India, United Kingdom, 3items
OrganizationGrant numberCountry
Science and Engineering Research Board (SERB)IPA/2020/000405 India
Wellcome TrustIA/S/20/1/504916 United Kingdom
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 10, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 26, 2025Provider: repository / Type: Initial release

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Structure visualization

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Assembly

Deposited unit
A: Guanine nucleotide-binding protein G(o) subunit alpha
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
D: C3a anaphylatoxin
E: Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
H: Antibody fragment - ScFv16


Theoretical massNumber of molelcules
Total (without water)170,0136
Polymers170,0136
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Guanine nucleotide-binding protein ... , 3 types, 3 molecules ABG

#1: Protein Guanine nucleotide-binding protein G(o) subunit alpha


Mass: 28193.939 Da / Num. of mol.: 1 / Mutation: G42D,E43N,A227D,G230D,I332A,V335I
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNAO1 / Production host: Escherichia coli (E. coli)
References: UniProt: P09471, Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement
#2: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transducin beta chain 1


Mass: 38534.062 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNB1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P62873
#5: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7861.143 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P59768

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Protein , 2 types, 2 molecules DE

#3: Protein C3a anaphylatoxin


Mass: 9431.053 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: C3 / Production host: Escherichia coli (E. coli) / References: UniProt: P01027
#4: Protein Muscarinic acetylcholine receptor M4,C3a anaphylatoxin chemotactic receptor / C3AR / C3a-R / Complement component 3a receptor 1


Mass: 59526.031 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) Mus musculus (house mouse)
Gene: CHRM4, C3ar1, C3r1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P08173, UniProt: O09047

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Antibody , 1 types, 1 molecules H

#6: Antibody Antibody fragment - ScFv16


Mass: 26466.486 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Escherichia coli (E. coli)

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Details

Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1mouse C3a bound mouse C3aR in complex with GoCOMPLEXall0RECOMBINANT
2mouse C3a anaphylatoxinCOMPLEX#31RECOMBINANT
3Guanine nucleotide-binding protein G(o) subunit alphaCOMPLEX#11RECOMBINANT
4Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2COMPLEX#51RECOMBINANT
5Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1COMPLEX#21RECOMBINANT
6Antibody fragment - ScFv16COMPLEX#61RECOMBINANT
7mouse C3a anaphylatoxin chemotactic receptorCOMPLEX#41RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
12Mus musculus (house mouse)10090
23Homo sapiens (human)9606
34Homo sapiens (human)9606
45Homo sapiens (human)9606
56Mus musculus (house mouse)10090
67Mus musculus (house mouse)10090
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
12Escherichia coli (E. coli)562
23Escherichia coli (E. coli)562
34Spodoptera frugiperda (fall armyworm)7108
45Spodoptera frugiperda (fall armyworm)7108
56Escherichia coli (E. coli)562
67Spodoptera frugiperda (fall armyworm)7108
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 50 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K3 (6k x 4k)
Image scansMovie frames/image: 40

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.6.2particle selection
2EPUimage acquisition
4cryoSPARC4.6.2CTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10cryoSPARC4.6.2initial Euler assignment
11cryoSPARC4.6.2final Euler assignment
12cryoSPARC4.6.2classification
13cryoSPARC4.6.23D reconstruction
CTF correctionType: NONE
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.54 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 175697 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 9KV6

9kv6


Accession code: 9KV6 / Source name: PDB / Type: experimental model

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