PDBe 1sfi

X-ray diffraction
1.65Å resolution

High resolution structure of a potent, cyclic protease inhibitor from sunflower seeds


Function and Biology Details

Structure analysis Details

Assembly composition:
hetero dimer (preferred)
Entry contents:
2 distinct polypeptide molecules
Macromolecules (2 distinct):
Cationic trypsin Chain: A
Molecule details ›
Chain: A
Length: 223 amino acids
Theoretical weight: 23.32 KDa
Source organism: Bos taurus
  • Canonical: P00760 (Residues: 24-246; Coverage: 97%)
Sequence domains: Trypsin
Structure domains: Trypsin-like serine proteases
Trypsin inhibitor 1 Chain: I
Molecule details ›
Chain: I
Length: 14 amino acids
Theoretical weight: 1.54 KDa
Source organism: Helianthus annuus
  • Canonical: Q4GWU5 (Residues: 40-53; Coverage: 45%)
Gene name: sfti1

Ligands and Environments

2 bound ligands:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: SRS BEAMLINE PX7.2
Spacegroup: P212121
Unit cell:
a: 60.61Å b: 64.43Å c: 70.62Å
α: 90° β: 90° γ: 90°
R R work R free
0.175 0.175 0.204