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1gpz

THE CRYSTAL STRUCTURE OF THE ZYMOGEN CATALYTIC DOMAIN OF COMPLEMENT PROTEASE C1R

Method: X-RAY DIFFRACTION Dmax: 122.6 Å Quality: GOOD
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1. Protein Identity and Related Structures Protein Identity & Related Structures

COMPLEMENT C1R COMPONENT

HOMO SAPIENS

UniProt P00736

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 Monomer Protein × 1 其他Polymer 1 PDB declaration: monomeric（1） Consistent with protein copy count Chain A； UniProt 307–705 Fragment：CATALYTIC DOMAIN OF HUMAN C1R, RESIDUES 307-705 Mutation：YES 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION X-ray crystallization conditions：pH 8.5；293 K；1.5 M AMMONIUM SULFATE, 0.1M TAPS, PH 8.5, AT 20 DEG C. Resolution 2.90 Å R-free 0.290
2 Other combination Monomer Protein × 1 其他Polymer 1 PDB declaration: monomeric（1） Consistent with protein copy count Chain B； UniProt 307–705 Fragment：CATALYTIC DOMAIN OF HUMAN C1R, RESIDUES 307-705 Mutation：YES ;alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose ; × 1 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION X-ray crystallization conditions：pH 8.5；293 K；1.5 M AMMONIUM SULFATE, 0.1M TAPS, PH 8.5, AT 20 DEG C. Resolution 2.90 Å R-free 0.290

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.

Other PDB Difference from Current Entry 1GPZ Assembly / Oligomeric State Construct Mutations and Modifications Ligands, Ions and Non-polymers Method and Experimental Conditions Structure Quality
1APQ STRUCTURE OF THE EGF-LIKE MODULE OF HUMAN C1R, NMR, 19 STRUCTURES Deposited 1997-07-22 Different construct Different mutation/modification Different oligomeric state Different experimental method Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 140–192（53 aa） Fragment：EGF-LIKE MODULE
Not recorded No recorded non-water small molecule SOLUTION NMR
NMR measurement conditions pH 6.7；288 K
Resolution not provided
1MD7 Monomeric structure of the zymogen of complement protease C1r Deposited 2002-08-07 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 375–702（328 aa） Fragment：C-terminal CCP-SP domain
Mutation：S637A NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.4；293 K；ammonium sulfate, TAPS, pH 8.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 3.20 Å R-free 0.285
1MD8 Monomeric structure of the active catalytic domain of complement protease C1r Deposited 2002-08-07 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 375–703（329 aa） Fragment：C-terminal CCP-SP domain
Not recorded No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 8.4；293 K；ammonium sulfate, TAPS, pH 8.4, VAPOR DIFFUSION, HANGING DROP, temperature 293K
Resolution 2.80 Å R-free 0.269
2QY0 Active dimeric structure of the catalytic domain of C1r reveals enzyme-product like contacts Deposited 2007-08-13 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein homooligomer Homooligomer；Protein × 4 PDB declaration: tetrameric
Chain A 309–463（155 aa） Fragment：Sushi-1 and Sushi-2 domains, CCP1-CCP2
Chain B 464–705（242 aa） Fragment：Peptidase S1 domain
Chain C 309–463（155 aa） Fragment：Sushi-1 and Sushi-2 domains, CCP1-CCP2
Chain D 464–705（242 aa） Fragment：Peptidase S1 domain
Not recorded GOL GLYCEROL × 7 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；pH 7.4；288 K；14% (w/v) PEG 6000, 0.2 M NaCl, 10% (v/v) glycerol, 0.1 M Tris HCl, pH 7.4, VAPOR DIFFUSION, HANGING DROP, temperature 288K
Resolution 2.60 Å R-free 0.259
6F1C C1rC1s complex Deposited 2017-11-21 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 4 PDB declaration: tetrameric
Chain A 18–308（291 aa）
Chain C 18–308（291 aa）
Not recorded CA CALCIUM ION × 12 NA SODIUM ION × 6 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 2 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；293 K；12-18% PEG 8000, 100 mM Imidazole at pH 8.0
Resolution 4.20 Å R-free 0.305
6F1D CUB2 domain of C1r Deposited 2017-11-21 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Protein monomer Monomer；Protein × 1 PDB declaration: monomeric
Chain A 191–307（117 aa）
Not recorded CA CALCIUM ION × 1 NA SODIUM ION × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8.5；298 K；50 mM Tris-HCl at pH 8.5 containing 25% PEG-8K, 2 mM CaCl2 and 3% 1,6-diaminohexane
Resolution 1.95 Å R-free 0.202
6F1H C1rC1s complex Deposited 2017-11-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Heteromer；Protein × 2 PDB declaration: dimeric
Chain A 18–308（291 aa）
Not recorded CA CALCIUM ION × 6 NA SODIUM ION × 3 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；12-18% PEG 8000, 100 mM Imidazole at pH 8.0
Resolution 4.50 Å R-free 0.340
6F1H C1rC1s complex Deposited 2017-11-22 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 2 Other combination Heteromer；Protein × 2 PDB declaration: dimeric
Chain C 18–308（291 aa）
Not recorded CA CALCIUM ION × 6 NA SODIUM ION × 3 LYS LYSINE × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；pH 8；298 K；12-18% PEG 8000, 100 mM Imidazole at pH 8.0
Resolution 4.50 Å R-free 0.340
6F39 C1r homodimer CUB1-EGF-CUB2 Deposited 2017-11-28 Different construct Different mutation/modification Different oligomeric state Different ligand/ion Different experimental conditions Different structure-quality metrics Assembly 1 Other combination Homooligomer；Protein × 2 PDB declaration: dimeric
Chain A 22–306（285 aa）
Chain B 22–306（285 aa）
Not recorded CA CALCIUM ION × 6 NA SODIUM ION × 2 NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；298 K；12-18% PEG 8000, 100 mM Imidazole at pH 8.0
Resolution 5.80 Å R-free 0.338
7MZT Borrelia burgdorferi BBK32-C in complex with an autolytic fragment of human C1r at 4.1A Deposited 2021-05-24 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 3 PDB declaration: trimeric
Chain A 300–463（164 aa）
Chain B 464–705（242 aa）
Not recorded NAG 2-acetamido-2-deoxy-beta-D-glucopyranose × 1 X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, SITTING DROP；293 K；0.2 M Sodium formate, 27.5% Polyethylene glycol 3,350
Resolution 4.07 Å R-free 0.372
9EKD Structure of a C1r Zymogen Fragment Bound to SALO Deposited 2024-12-02 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain C 308–705（398 aa） Fragment：residues 308-705
Mutation：S654A No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M BIS-TRIS (pH 5.6), 0.2 M ammonium sulfate, 20% (w/v) PEG-3350
Resolution 3.28 Å R-free 0.286
9EKD Structure of a C1r Zymogen Fragment Bound to SALO Deposited 2024-12-02 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain D 308–705（398 aa） Fragment：residues 308-705
Mutation：S654A No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.1 M BIS-TRIS (pH 5.6), 0.2 M ammonium sulfate, 20% (w/v) PEG-3350
Resolution 3.28 Å R-free 0.286
9EKE Structure of a C1r Zymogen Fragment Bound to SALO, Y51F Mutant Deposited 2024-12-02 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 1 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain C 308–705（398 aa）
Mutation：S654A No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium citrate tribasic (pH 7.0), 20% (w/v) PEG-3350
Resolution 3.10 Å R-free 0.278
9EKE Structure of a C1r Zymogen Fragment Bound to SALO, Y51F Mutant Deposited 2024-12-02 Different construct Different mutation/modification Different oligomeric state Different experimental conditions Different structure-quality metrics Assembly 2 Protein heterocomplex Heteromer；Protein × 2 PDB declaration: dimeric
Chain D 308–705（398 aa）
Mutation：S654A No recorded non-water small molecule X-RAY DIFFRACTION
X-ray crystallization conditions VAPOR DIFFUSION, HANGING DROP；293 K；0.2 M ammonium citrate tribasic (pH 7.0), 20% (w/v) PEG-3350
Resolution 3.10 Å R-free 0.278

11 other PDB entries and 14 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name C1R_HUMAN
Isoform —
PDB entities 1
Chains and sequence ranges Author chain A； PDBConstruct 1–399； UniProt 307–705 Author chain B； PDBConstruct 1–399； UniProt 307–705

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 1gpz

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1gpz
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1gpz
Deposition date deposition_date2001-11-15
Structure title titleTHE CRYSTAL STRUCTURE OF THE ZYMOGEN CATALYTIC DOMAIN OF COMPLEMENT PROTEASE C1R
Keywords keywordsHYDROLASE, ACTIVATION, COMPLEMENT, INNATE IMMUNITY, MODULAR STRUCTURE, SERINE PROTEASE; HYDROLASE
Experimental Method methodX-RAY DIFFRACTION
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3. SAXS Parameters (CRYSOL theoretical calculation) 3. SAXS Parameters (CRYSOL)

Radius of gyration Rg (Guinier) rg_guinier37.99 Å
Radius of gyration Rg (electron density) rg_electron37.78 Å
Forward intensity I(0) i0114263000.00
Molecular weight molecular_weight84727.0 kDa
Excluded volume excluded_volume105300 ų
Envelope volume envelope_volume148660 ų
Hydration-shell volume shell_volume34244 ų
Envelope diameter envelope_diameter125.4 Å
Shell Rg shell_rg42.22 Å
Envelope Rg envelope_rg36.39 Å
Shape Rg shape_rg37.78 Å
Total Rg total_rg38.05 Å
Total atoms total_atoms5956
Residues n_residues737
Spherical-harmonic order n_harmonics20
q range q_range— – 0.5000 Å−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
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4. P(r) Distance Distribution (GNOM inversion) 4. P(r) Analysis (GNOM)

Maximum dimension Dmax dmax122.6 Å
Rg (real space) rg_real38.23 Å
Rg uncertainty (real space) rg_real_error0.97 Å
I(0) (real space) i0_real1.1430e+08
I(0) uncertainty (real space) i0_real_error1.8470e+06
Rg (reciprocal space) rg_reciprocal38.09 Å
I(0) (reciprocal space) i0_reciprocal114200000.0000
Solution quality estimate total_estimate0.8556
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks1
Primary peak position r_peak_primary32.1 Å
Skewness Skewness skewness0.315
Kurtosis Kurtosis kurtosis-0.832
Angular range angular_range— – 0.2100 Å−1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha8091000.0000
Real-space data points n_real_points43
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.843; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.824; Smooth: 0.765
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5. Crystallography and Experiment 5. Crystallography & Experiment

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6. Entities and Polymers Entities & Polymers (5)

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7. Fold Classification (SCOP + CATH) 14 domains

SCOP 2.08 (6 domains)

Domain ID domain_idd1gpza1
Class classb — All beta proteins
Fold Fold foldb.47 — Trypsin-like serine proteases
Superfamily Superfamily superfamilyb.47.1 — Trypsin-like serine proteases
Family Family familyb.47.1.2 — Eukaryotic proteases
Domain ID domain_idd1gpza2
Class classg — Small proteins
Fold Fold foldg.18 — Complement control module/SCR domain
Superfamily Superfamily superfamilyg.18.1 — Complement control module/SCR domain
Family Family familyg.18.1.1 — Complement control module/SCR domain
Domain ID domain_idd1gpza3
Class classg — Small proteins
Fold Fold foldg.18 — Complement control module/SCR domain
Superfamily Superfamily superfamilyg.18.1 — Complement control module/SCR domain
Family Family familyg.18.1.1 — Complement control module/SCR domain
Domain ID domain_idd1gpzb1
Class classb — All beta proteins
Fold Fold foldb.47 — Trypsin-like serine proteases
Superfamily Superfamily superfamilyb.47.1 — Trypsin-like serine proteases
Family Family familyb.47.1.2 — Eukaryotic proteases
Domain ID domain_idd1gpzb2
Class classg — Small proteins
Fold Fold foldg.18 — Complement control module/SCR domain
Superfamily Superfamily superfamilyg.18.1 — Complement control module/SCR domain
Family Family familyg.18.1.1 — Complement control module/SCR domain
Domain ID domain_idd1gpzb3
Class classg — Small proteins
Fold Fold foldg.18 — Complement control module/SCR domain
Superfamily Superfamily superfamilyg.18.1 — Complement control module/SCR domain
Family Family familyg.18.1.1 — Complement control module/SCR domain

CATH v4.4 (8 domains)

Domain ID domain_id1gpzA01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzA02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzA03
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzA04
Class class2 — Mainly Beta
Architecture architecture10 — Ribbon
Topology topology70 — Complement Module; domain 1
Homologous superfamily homologous superfamily10 — Complement Module, domain 1
Domain ID domain_id1gpzB01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzB02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzB03
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id1gpzB04
Class class2 — Mainly Beta
Architecture architecture10 — Ribbon
Topology topology70 — Complement Module; domain 1
Homologous superfamily homologous superfamily10 — Complement Module, domain 1
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8. Citations (1)

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9. Files and Curves (10)