8eok

Structure of the C3bB proconvertase in complex with lufaxin and factor Xa

Method: ELECTRON MICROSCOPY Dmax: 176.2 Å Quality: REASONABLE

1. Protein Identity and Related Structures Protein Identity & Related Structures

Complement C3 beta chain

OrganismNot specified

UniProt P01024

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Other combination Heteromer Protein × 6 其他Polymer 1 PDB declaration: hexameric(6) Consistent with protein copy count Chain G; UniProt 23–667 Chain H; UniProt 749–1663 Not recorded Complement factor B × 1 (P00751) Lufaxin × 1 (Q5WPU8) Factor X light chain × 1 (P00742) Activated factor Xa heavy chain × 1 (P00742) beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 MG MAGNESIUM ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.53 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

74 other PDB entries and 117 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CO3_HUMAN
Isoform
PDB entities 1, 2
Chains and sequence ranges Author chain G; PDBConstruct 1–645; UniProt 23–667 Author chain H; PDBConstruct 1–915; UniProt 749–1663

Complement factor B

OrganismNot specified

UniProt P00751

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Other combination Heteromer Protein × 6 其他Polymer 1 PDB declaration: hexameric(6) Consistent with protein copy count Chain D; UniProt 2–764 Not recorded Complement C3 beta chain × 1 (P01024) ;Complement C3b alpha' chain ; × 1 (P01024) Lufaxin × 1 (Q5WPU8) Factor X light chain × 1 (P00742) Activated factor Xa heavy chain × 1 (P00742) beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 MG MAGNESIUM ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.53 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

25 other PDB entries and 44 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CFAB_HUMAN
Isoform
PDB entities 3
Chains and sequence ranges Author chain D; PDBConstruct 1–763; UniProt 2–764

Lufaxin

Lutzomyia longipalpis

UniProt Q5WPU8

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Other combination Heteromer Protein × 6 其他Polymer 1 PDB declaration: hexameric(6) Consistent with protein copy count Chain A; UniProt 24–301 Not recorded Complement C3 beta chain × 1 (P01024) ;Complement C3b alpha' chain ; × 1 (P01024) Complement factor B × 1 (P00751) Factor X light chain × 1 (P00742) Activated factor Xa heavy chain × 1 (P00742) beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 MG MAGNESIUM ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.53 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

2 other PDB entries and 3 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name LUFX_LUTLO
Isoform
PDB entities 4
Chains and sequence ranges Author chain A; PDBConstruct 1–278; UniProt 24–301

Factor X light chain

OrganismNot specified

UniProt P00742

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Other combination Heteromer Protein × 6 其他Polymer 1 PDB declaration: hexameric(6) Consistent with protein copy count Chain C; UniProt 235–488 Chain L; UniProt 46–179 Not recorded Complement C3 beta chain × 1 (P01024) ;Complement C3b alpha' chain ; × 1 (P01024) Complement factor B × 1 (P00751) Lufaxin × 1 (Q5WPU8) beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose × 1 MG MAGNESIUM ION × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 ELECTRON MICROSCOPY cryo-EM buffer:pH 7.5 cryo-EM vitrification conditions:Cryogen ETHANE Resolution 3.53 Å

Other States of the Same Protein in the Database

Each row is a biological assembly of the same UniProt protein in another PDB entry. The “Difference from current entry” column identifies evidence-level differences; no tag means the currently parsed fields agree.

183 other PDB entries and 220 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name FA10_HUMAN
Isoform
PDB entities 5, 6
Chains and sequence ranges Author chain L; PDBConstruct 1–134; UniProt 46–179 Author chain C; PDBConstruct 1–254; UniProt 235–488

The page prioritizes protein identity, the current assembly, associated components, oligomeric state and cross-PDB links. Chain mapping and sequence ranges are retained as data evidence. Internal IDs, import timestamps and assembly operation expressions are maintenance fields and are not shown here.

SAXS scattering curve SAXS Profile

SAXS profile for 8eok

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 8eok
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2. Structure Basics 2. Structure Basics

Entry ID entry_id8eok
Deposition date deposition_date2022-10-03
Structure title titleStructure of the C3bB proconvertase in complex with lufaxin and factor Xa
Keywords keywordsComplement, Alternative pathway, inhibitor, sand fly, IMMUNE SYSTEM; IMMUNE SYSTEM
Experimental Method methodELECTRON MICROSCOPY

3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier53.82
Radius of gyration Rg (electron density) rg_electron53.42
Forward intensity I(0) i01436810000.00
Molecular weight molecular_weight316150.0 kDa
Excluded volume excluded_volume395630 ų
Envelope volume envelope_volume631350 ų
Hydration-shell volume shell_volume98121 ų
Envelope diameter envelope_diameter177.1
Shell Rg shell_rg57.38
Envelope Rg envelope_rg51.56
Shape Rg shape_rg53.41
Total Rg total_rg53.60
Total atoms total_atoms22233
Residues n_residues2785
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 −1
Data points n_points101
Shell type shell_typedirectional
Solvent electron density solvent_density0.3340 e/ų
Shell contrast contrast_shell0.0300 e/ų
CRYSOL version crysol_version4.1.3

4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax176.2
Rg (real space) rg_real53.65
Rg uncertainty (real space) rg_real_error1.19
I(0) (real space) i0_real1.4370e+09
I(0) uncertainty (real space) i0_real_error2.6120e+07
Rg (reciprocal space) rg_reciprocal53.94
I(0) (reciprocal space) i0_reciprocal1437000000.0000
Solution quality estimate total_estimate0.6639
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary66.8
Skewness Skewness skewness0.138
Kurtosis Kurtosis kurtosis-0.579
Angular range angular_range— – 0.1450 −1
Current regularization parameter α current_alpha0.0006
Highest regularization parameter α highest_alpha99730000.0000
Real-space data points n_real_points30
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.916; Stabil: 1.000; Sysdev: 0.001; Positv: 1.000; Valcen: 0.984; Smooth: 0.891

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (9)

7. Fold Classification (SCOP + CATH) 4 domains

CATH v4.4 (4 domains)

Domain ID domain_id8eokC01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id8eokH01
Class class2 — Mainly Beta
Architecture architecture60 — Sandwich
Topology topology40 — Immunoglobulin-like
Homologous superfamily homologous superfamily10 — Immunoglobulins
Domain ID domain_id8eokH02
Class class1 — Mainly Alpha
Architecture architecture50 — Alpha/alpha barrel
Topology topology10 — Glycosyltransferase
Homologous superfamily homologous superfamily20
Domain ID domain_id8eokH03
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology50 — OB fold (Dihydrolipoamide Acetyltransferase, E2P)
Homologous superfamily homologous superfamily120

8. Citations (1)

9. Files and Curves (10)