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- PDB-9qj4: Structure of the Complement classical and lectin pathway proconve... -

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Basic information

Entry
Database: PDB / ID: 9qj4
TitleStructure of the Complement classical and lectin pathway proconvertase, C4b2
Components
  • Complement C2
  • Complement C4-A
KeywordsIMMUNE SYSTEM / Proconvertase / Complement / classical pathway / C4b2
Function / homology
Function and homology information


classical-complement-pathway C3/C5 convertase / complement component C1q complex binding / response to thyroid hormone / positive regulation of apoptotic cell clearance / Activation of C3 and C5 / complement activation / endopeptidase inhibitor activity / Initial triggering of complement / complement activation, classical pathway / response to nutrient ...classical-complement-pathway C3/C5 convertase / complement component C1q complex binding / response to thyroid hormone / positive regulation of apoptotic cell clearance / Activation of C3 and C5 / complement activation / endopeptidase inhibitor activity / Initial triggering of complement / complement activation, classical pathway / response to nutrient / Regulation of Complement cascade / Post-translational protein phosphorylation / response to bacterium / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / blood microparticle / response to lipopolysaccharide / endoplasmic reticulum lumen / inflammatory response / axon / innate immune response / serine-type endopeptidase activity / neuronal cell body / synapse / dendrite / proteolysis / extracellular space / extracellular exosome / extracellular region / metal ion binding / plasma membrane
Similarity search - Function
: / : / Complement C4, MG1 domain / Complement C4A/B CUB C-terminal domain / Complement B/C2 / Alpha-2-macroglobulin, conserved site / Alpha-2-macroglobulin family thiolester region signature. / Anaphylatoxin, complement system domain / : / Alpha-macro-globulin thiol-ester bond-forming region ...: / : / Complement C4, MG1 domain / Complement C4A/B CUB C-terminal domain / Complement B/C2 / 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 / 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, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
Complement C2 / Complement C4-A
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsDe la O Becerra, K.I. / Brondijk, T.H.C. / Gros, P.
Funding support Mexico, Netherlands, European Union, 3items
OrganizationGrant numberCountry
Consejo Nacional de Ciencia y Tecnologia (CONACYT)CVU 604718 Mexico
Netherlands Organisation for Scientific Research (NWO)01.80.104.00 Netherlands
European Research Council (ERC)787241European Union
CitationJournal: To Be Published
Title: Mechanistic insights into complement classical pathway C3 convertase based on cryo-EM structures
Authors: De la O Becerra, K.I. / Brondijk, T.H.C. / Serna Martin, I. / Gros, P.
History
DepositionMar 18, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0Dec 24, 2025Provider: repository / Type: Initial release
Revision 1.0Dec 24, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Dec 24, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.0Dec 24, 2025Data 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
A: Complement C4-A
C: Complement C4-A
B: Complement C4-A
D: Complement C2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)663,0738
Polymers662,3854
Non-polymers6884
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein Complement C4-A / Acidic complement C4 / C3 and PZP-like alpha-2-macroglobulin domain-containing protein 2


Mass: 193007.234 Da / Num. of mol.: 3 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Organ: blood plasma / References: UniProt: P0C0L4
#2: Protein Complement C2 / C3/C5 convertase


Mass: 83363.766 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / Organ: blood plasma
References: UniProt: P06681, classical-complement-pathway C3/C5 convertase
#3: 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.: 3 / Source method: obtained synthetically / Formula: C8H15NO6
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
#4: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
Has ligand of interestN
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: Classical and lectin pathway C3 proconvertase / Type: COMPLEX / Entity ID: #1-#2 / Source: NATURAL
Molecular weightValue: 0.288 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human) / Tissue: blood plasma
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaCl1
220 mMHEPES1
32 mMMagnesium chlorideMgCl21
SpecimenConc.: 0.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: Complex was crosslinked with glutaraldehyde 0.2%
Specimen supportGrid material: GOLD / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2200 nm / Nominal defocus min: 1000 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 2.24 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4662

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Processing

EM software
IDNameVersionCategory
1cryoSPARCv3.2/3particle selection
2EPU2.10.0image acquisition
4cryoSPARCv3.2/3CTF correction
7UCSF ChimeraX1.7model fitting
9cryoSPARCv3.2/3initial Euler assignment
10cryoSPARCv3.2/3final Euler assignment
11cryoSPARCv3.2/3classification
12cryoSPARCv3.2/33D reconstruction
19PHENIX2.21.1model refinement
20Coot0.9.8.94model refinement
CTF correctionType: NONE
Particle selectionNum. of particles selected: 2647189
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 31895 / Num. of class averages: 3 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model building

3D fitting-ID: 1 / Source name: PDB / Type: experimental model

IDPDB-IDPdb chain-IDAccession codeChain-IDInitial refinement model-ID
15JTW

5jtw

A5JTWA1
25JTW

5jtw

B5JTWB1
35JTW

5jtw

C5JTWC1
43ERB

3erb

D3ERBD2
52I6Q

2i6q

D2I6QD
RefinementHighest resolution: 3.9 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00415613
ELECTRON MICROSCOPYf_angle_d0.82721182
ELECTRON MICROSCOPYf_dihedral_angle_d5.5482196
ELECTRON MICROSCOPYf_chiral_restr0.0472343
ELECTRON MICROSCOPYf_plane_restr0.0052763

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