3ru4

Crystal structure of the Bowman-Birk serine protease inhibitor BTCI in complex with trypsin and chymotrypsin

Method: X-RAY DIFFRACTION Dmax: 89.7 Å Quality: GOOD

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

Cationic trypsin

OrganismNot specified

UniProt P00760

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain T; UniProt 24–246 Not recorded Bowman-Birk type seed trypsin and chymotrypsin inhibitor × 1 (P17734) Chymotrypsinogen A × 1 (P00766) Chymotrypsinogen A × 1 (P00766) Chymotrypsinogen A × 1 (P00766) CA CALCIUM ION × 1 GOL GLYCEROL × 6 SO4 SULFATE ION × 9 EDO 1,2-ETHANEDIOL × 6 MRD (4R)-2-METHYLPENTANE-2,4-DIOL × 2 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, SITTING DROP;pH 7.5;294 K;0.1 M HEPES pH 7.5, 10%(w/v) polyethylene glycol (PEG) 6000, 5%(v/v) 2-methyl-2,4-pentanediol (MPD), VAPOR DIFFUSION, SITTING DROP, temperature 294K Resolution 1.68 Å R-free 0.192

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.

608 other PDB entries and 770 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name TRY1_BOVIN
Isoform
PDB entities 1
Chains and sequence ranges Author chain T; PDBConstruct 1–223; UniProt 24–246

Bowman-Birk type seed trypsin and chymotrypsin inhibitor

OrganismNot specified

UniProt P17734

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain B; UniProt 14–74 Not recorded Cationic trypsin × 1 (P00760) Chymotrypsinogen A × 1 (P00766) Chymotrypsinogen A × 1 (P00766) Chymotrypsinogen A × 1 (P00766) CA CALCIUM ION × 1 GOL GLYCEROL × 6 SO4 SULFATE ION × 9 EDO 1,2-ETHANEDIOL × 6 MRD (4R)-2-METHYLPENTANE-2,4-DIOL × 2 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, SITTING DROP;pH 7.5;294 K;0.1 M HEPES pH 7.5, 10%(w/v) polyethylene glycol (PEG) 6000, 5%(v/v) 2-methyl-2,4-pentanediol (MPD), VAPOR DIFFUSION, SITTING DROP, temperature 294K Resolution 1.68 Å R-free 0.192

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.

1 other PDB entries and 1 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name IBB_VIGUN
Isoform
PDB entities 2
Chains and sequence ranges Author chain B; PDBConstruct 1–61; UniProt 14–74

Chymotrypsinogen A

OrganismNot specified

UniProt P00766

State in the Current Structure

Assembly Oligomeric State Construct Mutations and Modifications Ligands, Ions and Associated Components Method and Experimental Conditions Structure Quality
1 Protein heterocomplex Heteromer Protein × 5 PDB declaration: pentameric(5) Consistent with protein copy count Chain C; UniProt 1–11 Chain D; UniProt 16–146 Chain E; UniProt 150–245 Not recorded Cationic trypsin × 1 (P00760) Bowman-Birk type seed trypsin and chymotrypsin inhibitor × 1 (P17734) CA CALCIUM ION × 1 GOL GLYCEROL × 6 SO4 SULFATE ION × 9 EDO 1,2-ETHANEDIOL × 6 MRD (4R)-2-METHYLPENTANE-2,4-DIOL × 2 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, SITTING DROP;pH 7.5;294 K;0.1 M HEPES pH 7.5, 10%(w/v) polyethylene glycol (PEG) 6000, 5%(v/v) 2-methyl-2,4-pentanediol (MPD), VAPOR DIFFUSION, SITTING DROP, temperature 294K Resolution 1.68 Å R-free 0.192

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.

91 other PDB entries and 177 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name CTRA_BOVIN
Isoform
PDB entities 3, 4, 5
Chains and sequence ranges Author chain C; PDBConstruct 1–11; UniProt 1–11 Author chain D; PDBConstruct 1–131; UniProt 16–146 Author chain E; PDBConstruct 1–96; UniProt 150–245

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 3ru4

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 3ru4
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2. Structure Basics 2. Structure Basics

Entry ID entry_id3ru4
Deposition date deposition_date2011-05-04
Structure title titleCrystal structure of the Bowman-Birk serine protease inhibitor BTCI in complex with trypsin and chymotrypsin
Keywords keywordsserine protease and bowman-birk fold, digestion and inhibition, HYDROLASE-HYDROLASE INHIBITOR complex; HYDROLASE/HYDROLASE INHIBITOR
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier26.38
Radius of gyration Rg (electron density) rg_electron26.11
Forward intensity I(0) i058924200.00
Molecular weight molecular_weight57050.0 kDa
Excluded volume excluded_volume70113 ų
Envelope volume envelope_volume80094 ų
Hydration-shell volume shell_volume26306 ų
Envelope diameter envelope_diameter92.7
Shell Rg shell_rg32.45
Envelope Rg envelope_rg26.27
Shape Rg shape_rg26.14
Total Rg total_rg26.62
Total atoms total_atoms3956
Residues n_residues522
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 dmax89.7
Rg (real space) rg_real26.53
Rg uncertainty (real space) rg_real_error0.80
I(0) (real space) i0_real5.8920e+07
I(0) uncertainty (real space) i0_real_error8.3970e+05
Rg (reciprocal space) rg_reciprocal26.49
I(0) (reciprocal space) i0_reciprocal58920000.0000
Solution quality estimate total_estimate0.8502
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary25.4
Skewness Skewness skewness0.493
Kurtosis Kurtosis kurtosis-0.347
Angular range angular_range— – 0.3000 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha15300000.0000
Real-space data points n_real_points61
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.765; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.827; Smooth: 0.927

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (11)

7. Fold Classification (SCOP + CATH) 7 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd3ru4b_
Class classg — Small proteins
Fold Fold foldg.3 — Knottins (small inhibitors, toxins, lectins)
Superfamily Superfamily superfamilyg.3.13 — Bowman-Birk inhibitor, BBI
Family Family familyg.3.13.1 — Bowman-Birk inhibitor, BBI
Domain ID domain_idd3ru4t_
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

CATH v4.4 (5 domains)

Domain ID domain_id3ru4B00
Class class2 — Mainly Beta
Architecture architecture10 — Ribbon
Topology topology69 — Cysteine Protease (Bromelain) Inhibitor, subunit H
Homologous superfamily homologous superfamily10 — Cysteine Protease (Bromelain) Inhibitor, subunit H
Domain ID domain_id3ru4D00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id3ru4E00
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id3ru4T01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id3ru4T02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases

8. Citations (2)

9. Files and Curves (10)