PDBe 1np8

X-ray diffraction
2Å resolution

18-k C-terminally trunucated small subunit of calpain


Function and Biology Details

Biochemical function:
Biological process:
  • not assigned
Cellular component:
  • not assigned

Structure analysis Details

Assembly composition:
homo dimer (preferred)
Entry contents:
1 distinct polypeptide molecule
Calpain small subunit 1 Chains: A, B
Molecule details ›
Chains: A, B
Length: 159 amino acids
Theoretical weight: 18.35 KDa
Source organism: Rattus norvegicus
Expression system: Escherichia coli
  • Canonical: Q64537 (Residues: 91-249; Coverage: 59%)
Gene names: Capn4, Capns1, Css1
Sequence domains: EF-hand domain pair
Structure domains: EF-hand

Ligands and Environments

1 bound ligand:

No modified residues

Experiments and Validation Details

Entry percentile scores
X-ray source: RIGAKU
Spacegroup: P212121
Unit cell:
a: 58.04Å b: 67.57Å c: 75.07Å
α: 90° β: 90° γ: 90°
R R work R free
0.212 0.196 0.239
Expression system: Escherichia coli