1k6u

Crystal Structure of Cyclic Bovine Pancreatic Trypsin Inhibitor

Method: X-RAY DIFFRACTION Dmax: 44.1 Å Quality: GOOD

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

PANCREATIC TRYPSIN INHIBITOR

OrganismNot specified

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 monomer Monomer Protein × 1 PDB declaration: monomeric(1) Consistent with protein copy count Chain A; UniProt 36–93 Not recorded SO4 SULFATE ION × 7 EDO 1,2-ETHANEDIOL × 2 X-RAY DIFFRACTION X-ray crystallization conditions:VAPOR DIFFUSION, HANGING DROP;pH 7.5;295 K;2M Ammonium sulfate, 2% PEG 400, 0.1M Hepes, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 295K Resolution 1.00 Å R-free 0.162

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 265 assemblies. Open the comparison page and filter oligomeric states

View Construct and Data Evidence
UniProt name BPT1_BOVIN
Isoform
PDB entities 1
Chains and sequence ranges Author chain A; 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 1k6u

P(r) Distance Distribution P(r) Distribution

P(r) distribution for 1k6u
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2. Structure Basics 2. Structure Basics

Entry ID entry_id1k6u
Deposition date deposition_date2001-10-17
Structure title titleCrystal Structure of Cyclic Bovine Pancreatic Trypsin Inhibitor
Keywords keywordsBPTI, cyclic protein, atomic resolution, hydrolase inhibitor; hydrolase inhibitor
Experimental Method methodX-RAY DIFFRACTION

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

Radius of gyration Rg (Guinier) rg_guinier12.79
Radius of gyration Rg (electron density) rg_electron11.41
Forward intensity I(0) i01528220.00
Molecular weight molecular_weight7193.0 kDa
Excluded volume excluded_volume8468 ų
Envelope volume envelope_volume9915 ų
Hydration-shell volume shell_volume7790 ų
Envelope diameter envelope_diameter42.3
Shell Rg shell_rg16.53
Envelope Rg envelope_rg11.95
Shape Rg shape_rg11.26
Total Rg total_rg12.91
Total atoms total_atoms490
Residues n_residues58
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 dmax44.1
Rg (real space) rg_real12.80
Rg uncertainty (real space) rg_real_error0.33
I(0) (real space) i0_real1.5280e+06
I(0) uncertainty (real space) i0_real_error1.8240e+04
Rg (reciprocal space) rg_reciprocal12.80
I(0) (reciprocal space) i0_reciprocal1528000.0000
Solution quality estimate total_estimate0.8672
Solution quality rating solution_quality GOOD a GOOD solution
P(r) peaks n_peaks2
Primary peak position r_peak_primary14.5
Skewness Skewness skewness0.377
Kurtosis Kurtosis kurtosis-0.211
Angular range angular_range— – 0.5000 −1
Current regularization parameter α current_alpha0.0000
Highest regularization parameter α highest_alpha331500.0000
Real-space data points n_real_points80
GNOM version gnom_version4.1.3
Quality Criteria quality_criteria AN1: 0.000; Oscil: 0.799; Stabil: 1.000; Sysdev: 1.000; Positv: 1.000; Valcen: 0.932; Smooth: 0.941

5. Crystallography and Experiment 5. Crystallography & Experiment

6. Entities and Polymers Entities & Polymers (4)

7. Fold Classification (SCOP + CATH) 2 domains

SCOP 2.08 (1 domains)

Domain ID domain_idd1k6ua_
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 (1 domains)

Domain ID domain_id1k6uA00
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)