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- PDB-9u62: AP pathways C3 convertase C3bBbP and C3 complex -

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Basic information

Entry
Database: PDB / ID: 9u62
TitleAP pathways C3 convertase C3bBbP and C3 complex
Components
  • Complement C3
  • Complement factor B Bb
  • Properdin
KeywordsIMMUNE SYSTEM / AP pathways / C3 convertases and substrate / C3bBbP_C3 complex
Function / homology
Function and homology information


cytoplasmic side of Golgi membrane / alternative-complement-pathway C3/C5 convertase / positive regulation of opsonization / Defective B3GALTL causes PpS / O-glycosylation of TSR domain-containing proteins / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / complement binding / positive regulation of activation of membrane attack complex ...cytoplasmic side of Golgi membrane / alternative-complement-pathway C3/C5 convertase / positive regulation of opsonization / Defective B3GALTL causes PpS / O-glycosylation of TSR domain-containing proteins / C5L2 anaphylatoxin chemotactic receptor binding / oviduct epithelium development / regulation of triglyceride biosynthetic process / complement binding / 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 / positive regulation of phagocytosis, engulfment / Activation of C3 and C5 / positive regulation of lipid storage / positive regulation of G protein-coupled receptor signaling pathway / positive regulation of type IIa hypersensitivity / complement receptor mediated signaling pathway / complement-dependent cytotoxicity / positive regulation of D-glucose transmembrane transport / complement activation / complement activation, alternative pathway / endopeptidase inhibitor activity / neuron remodeling / amyloid-beta clearance / B cell activation / positive regulation of vascular endothelial growth factor production / complement activation, classical pathway / Purinergic signaling in leishmaniasis infection / Peptide ligand-binding receptors / Regulation of Complement cascade / Post-translational protein phosphorylation / response to bacterium / fatty acid metabolic process / positive regulation of immune response / positive regulation of receptor-mediated endocytosis / specific granule lumen / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / positive regulation of angiogenesis / Immunoregulatory interactions between a Lymphoid and a non-Lymphoid cell / positive regulation of protein phosphorylation / azurophil granule lumen / tertiary granule lumen / secretory granule lumen / blood microparticle / G alpha (i) signalling events / defense response to bacterium / immune response / receptor ligand activity / G protein-coupled receptor signaling pathway / endoplasmic reticulum lumen / inflammatory response / signaling receptor binding / serine-type endopeptidase activity / Neutrophil degranulation / cell surface / signal transduction / protein-containing complex / proteolysis / extracellular space / extracellular exosome / extracellular region / plasma membrane
Similarity search - Function
: / : / Thrombospondin type 1 repeat / CFP-like, C-terminal thrombospondin type 1 domain / : / Complement factor B / Complement B/C2 / Complement C3-like, NTR domain / : / : ...: / : / Thrombospondin type 1 repeat / CFP-like, C-terminal thrombospondin type 1 domain / : / Complement factor B / Complement B/C2 / Complement C3-like, NTR domain / : / : / Complement component 3, CUB domain, second segment / Complement component 3, CUB domain, first segment / 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 / Thrombospondin type 1 domain / Thrombospondin type-1 (TSP1) repeat superfamily / Thrombospondin type-1 (TSP1) repeat profile. / Thrombospondin type 1 repeats / Thrombospondin type-1 (TSP1) repeat / Sushi repeat (SCR repeat) / Domain abundant in complement control proteins; SUSHI repeat; short complement-like repeat (SCR) / von Willebrand factor type A domain / Sushi/SCR/CCP domain / Sushi/CCP/SCR domain profile. / Sushi/SCR/CCP superfamily / Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid / VWFA domain profile. / von Willebrand factor (vWF) type A domain / von Willebrand factor, type A / von Willebrand factor A-like domain superfamily / Serine proteases, trypsin family, histidine active site / Serine proteases, trypsin family, serine active site / Serine proteases, trypsin family, histidine active site. / Peptidase S1A, chymotrypsin family / Serine proteases, trypsin family, serine active site. / Serine proteases, trypsin domain profile. / Trypsin-like serine protease / Serine proteases, trypsin domain / Trypsin / Immunoglobulin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
NICKEL (II) ION / Complement factor B / Complement C3 / Properdin
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.7 Å
AuthorsYang, X.K. / Xiao, J.Y.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Sci Adv / Year: 2026
Title: Complement C3 Recognition by C3 Convertases
Authors: Yang, X.K. / Xiao, J.Y.
History
DepositionMar 22, 2025Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Jan 14, 2026Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Jan 14, 2026Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
D: Complement C3
B: Complement factor B Bb
P: Properdin
E: Complement C3
C: Complement C3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)670,36312
Polymers668,7735
Non-polymers1,5897
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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Protein , 3 types, 5 molecules DECBP

#1: Protein Complement C3 / C3 and PZP-like alpha-2-macroglobulin domain-containing protein 1


Mass: 187370.969 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: C3, CPAMD1 / Production host: Homo sapiens (human) / References: UniProt: P01024
#2: Protein Complement factor B Bb / Bb


Mass: 57116.121 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CFB, BF, BFD / Production host: Homo sapiens (human) / References: UniProt: P00751
#3: Protein Properdin / Complement factor P


Mass: 49544.359 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CFP, PFC / Production host: Homo sapiens (human) / References: UniProt: P27918

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Sugars , 2 types, 6 molecules

#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1 / Source method: obtained synthetically
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#5: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: C8H15NO6 / Feature type: SUBJECT OF INVESTIGATION
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Non-polymers , 1 types, 1 molecules

#6: Chemical ChemComp-NI / NICKEL (II) ION


Mass: 58.693 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Ni / Feature type: SUBJECT OF INVESTIGATION

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Details

Has ligand of interestY
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

ComponentName: AP pathways C3 convertases C3bBb and C3 complex / Type: COMPLEX / Entity ID: #1-#3 / Source: NATURAL
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: DIFFRACTION / Nominal defocus max: 1500 nm / Nominal defocus min: 1100 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARCparticle selection
2PHENIX1.20.1_4487model refinement
5cryosCTF correction
13cryoSPARC3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 2.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 389342 / Symmetry type: POINT
RefinementHighest resolution: 2.7 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00430099
ELECTRON MICROSCOPYf_angle_d0.74440764
ELECTRON MICROSCOPYf_dihedral_angle_d5.054042
ELECTRON MICROSCOPYf_chiral_restr0.0534613
ELECTRON MICROSCOPYf_plane_restr0.0075243

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