PDBe 4bd9

X-ray diffraction
2.2Å resolution

Structure of the complex between SmCI and human carboxypeptidase A4


Function and Biology Details

Structure analysis Details

Assembly composition:
hetero dimer (preferred)
Entry contents:
2 distinct polypeptide molecules
Macromolecules (2 distinct):
Carboxypeptidase A4 Chain: A
Molecule details ›
Chain: A
Length: 310 amino acids
Theoretical weight: 34.85 KDa
Source organism: Homo sapiens
Expression system: Komagataella pastoris
  • Canonical: Q9UI42 (Residues: 112-421; Coverage: 77%)
Gene names: CPA3, CPA4, UNQ694/PRO1339
Sequence domains: Zinc carboxypeptidase
Structure domains: Zn peptidases
Carboxypeptidase inhibitor SmCI Chain: B
Molecule details ›
Chain: B
Length: 165 amino acids
Theoretical weight: 18.62 KDa
Source organism: Sabellastarte magnifica
Expression system: Komagataella pastoris
  • Canonical: P84875 (Residues: 1-165; Coverage: 100%)
Sequence domains: Kunitz/Bovine pancreatic trypsin inhibitor domain
Structure domains: Pancreatic trypsin inhibitor Kunitz domain

Ligands and Environments

1 bound ligand:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: ESRF BEAMLINE ID23-2
Spacegroup: P6522
Unit cell:
a: 138.67Å b: 138.67Å c: 161.56Å
α: 90° β: 90° γ: 120°
R R work R free
0.225 0.223 0.254
Expression system: Komagataella pastoris