2fi3

Crystal structure of a BPTI variant (Cys14->Ser, Cys38->Ser) in complex with trypsin

Method: X-RAY DIFFRACTION Dmax: 64.4 Å Quality: REASONABLE

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 × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 1 (P00974) NA SODIUM ION × 1 CA CALCIUM ION × 2 SO4 SULFATE ION × 8 EDO 1,2-ETHANEDIOL × 6 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
2 Protein heterocomplex Heteromer Protein × 8 PDB declaration: octameric(8) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 4 (P00974) NA SODIUM ION × 4 CA CALCIUM ION × 8 SO4 SULFATE ION × 32 EDO 1,2-ETHANEDIOL × 24 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
3 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 2 (P00974) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
4 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 2 (P00974) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
5 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 2 (P00974) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
6 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 2 (P00974) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
7 Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain E; UniProt 21–243 Not recorded Pancreatic trypsin inhibitor × 1 (P00974) NA SODIUM ION × 1 CA CALCIUM ION × 2 SO4 SULFATE ION × 8 EDO 1,2-ETHANEDIOL × 6 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218

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 764 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 E; PDBConstruct 1–216; UniProt 21–243

Pancreatic trypsin inhibitor

Bos taurus

UniProt P00974

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 × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 1 (P00760) NA SODIUM ION × 1 CA CALCIUM ION × 2 SO4 SULFATE ION × 8 EDO 1,2-ETHANEDIOL × 6 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
2 Protein heterocomplex Heteromer Protein × 8 PDB declaration: octameric(8) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 4 (P00760) NA SODIUM ION × 4 CA CALCIUM ION × 8 SO4 SULFATE ION × 32 EDO 1,2-ETHANEDIOL × 24 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
3 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 2 (P00760) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
4 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 2 (P00760) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
5 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 2 (P00760) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
6 Protein heterocomplex Heteromer Protein × 4 PDB declaration: tetrameric(4) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 2 (P00760) NA SODIUM ION × 2 CA CALCIUM ION × 4 SO4 SULFATE ION × 16 EDO 1,2-ETHANEDIOL × 12 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218
7 Protein heterocomplex Heteromer Protein × 2 PDB declaration: dimeric(2) Consistent with protein copy count Chain I; UniProt 36–93 Mutation:C14S, C38S Cationic trypsin × 1 (P00760) NA SODIUM ION × 1 CA CALCIUM ION × 2 SO4 SULFATE ION × 8 EDO 1,2-ETHANEDIOL × 6 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;296 K;1.75 M ammonium sulfate, 0.1 M HEPES, 0.02% sodium azide, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 296K Resolution 1.58 Å R-free 0.218

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.

123 other PDB entries and 259 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name BPT1_BOVIN
Isoform
PDB entities 2
Chains and sequence ranges Author chain I; PDBConstruct 1–58; UniProt 36–93

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 2fi3

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 2fi3
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2. Structure Basics 2. Structure Basics

Entry ID entry_id2fi3
Deposition date deposition_date2005-12-27
Structure title titleCrystal structure of a BPTI variant (Cys14->Ser, Cys38->Ser) in complex with trypsin
Keywords keywordsPROTEASE-INHIBITOR COMPLEX, 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_guinier19.85
Radius of gyration Rg (electron density) rg_electron18.66
Forward intensity I(0) i018991700.00
Molecular weight molecular_weight30943.0 kDa
Excluded volume excluded_volume37817 ų
Envelope volume envelope_volume43467 ų
Hydration-shell volume shell_volume19487 ų
Envelope diameter envelope_diameter66.1
Shell Rg shell_rg25.12
Envelope Rg envelope_rg19.17
Shape Rg shape_rg18.58
Total Rg total_rg19.74
Total atoms total_atoms2143
Residues n_residues278
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 dmax64.4
Rg (real space) rg_real19.78
Rg uncertainty (real space) rg_real_error0.41
I(0) (real space) i0_real1.8990e+07
I(0) uncertainty (real space) i0_real_error2.2320e+05
Rg (reciprocal space) rg_reciprocal19.79
I(0) (reciprocal space) i0_reciprocal18990000.0000
Solution quality estimate total_estimate0.6606
Solution quality rating solution_quality REASONABLE a REASONABLE solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary24.5
Skewness Skewness skewness0.298
Kurtosis Kurtosis kurtosis-0.277
Angular range angular_range— – 0.4000 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha4693000.0000
Real-space data points n_real_points72
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.858; Stabil: 0.999; Sysdev: 0.338; Positv: 1.000; Valcen: 0.996; Smooth: 0.000

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (7)

7. Fold Classification (SCOP + CATH) 5 domains

SCOP 2.08 (2 domains)

Domain ID domain_idd2fi3e_
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_idd2fi3i1
Class classg — Small proteins
Fold Fold foldg.8 — BPTI-like
Superfamily Superfamily superfamilyg.8.1 — BPTI-like
Family Family familyg.8.1.1 — Small Kunitz-type inhibitors & BPTI-like toxins

CATH v4.4 (3 domains)

Domain ID domain_id2fi3E01
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id2fi3E02
Class class2 — Mainly Beta
Architecture architecture40 — Beta Barrel
Topology topology10 — Thrombin, subunit H
Homologous superfamily homologous superfamily10 — Trypsin-like serine proteases
Domain ID domain_id2fi3I00
Class class4 — Few Secondary Structures
Architecture architecture10 — Irregular
Topology topology410 — Factor Xa Inhibitor
Homologous superfamily homologous superfamily10 — Pancreatic trypsin inhibitor Kunitz domain

8. Citations (1)

9. Files and Curves (10)