CATH Classification

Domain Context

CATH Clusters

Superfamily 3.40.50.1460
Functional Family Caspase-3 preproprotein

Enzyme Information

3.4.22.56
Caspase-3.
based on mapping to UniProt P42574
Strict requirement for an Asp residue at positions P1 and P4. It has a preferred cleavage sequence of Asp-Xaa-Xaa-Asp-|- with a hydrophobic amino-acid residue at P2 and a hydrophilic amino-acid residue at P3, although Val or Ala are also accepted at this position.
-!- Caspase-3 is an effector/executioner caspase, as are caspase-6 (EC 3.4.22.59) and caspase-7 (EC 3.4.22.60). -!- These caspases are responsible for the proteolysis of the majority of cellular polypeptides, (e.g. poly(ADP-ribose) polymerase (PARP)), which leads to the apoptotic phenotype. -!- Procaspase-3 can be activated by caspase-1 (EC 3.4.22.36), caspase-8 (EC 3.4.22.61), caspase-9 (EC 3.4.22.62) and caspase-10 (EC 3.4.22.63) as well as by the serine protease granzyme B. -!- Caspase-3 can activate procaspase-2 (EC 3.4.22.55). -!- Activation occurs by inter-domain cleavage followed by removal of the N-terminal prodomain. -!- While Asp-Glu-(Val/Ile)-Asp is thought to be the preferred cleavage sequence, the enzyme can accommodate different residues at P2 and P3 of the substrate. -!- Like caspase-2, a hydrophobic residue at P5 of caspase-3 leads to more efficient hydrolysis, e.g. (Val/Leu)-Asp-Val-Ala-Asp-|- is a better substrate than Asp-Val-Ala-Asp-|-. -!- This is not the case for caspase-7. -!- Belongs to peptidase family C14.

UniProtKB Entries (1)

P42574
CASP3_HUMAN
Homo sapiens
Caspase-3

PDB Structure

PDB 1NMS
External Links
Method X-RAY DIFFRACTION
Organism Escherichia
Primary Citation
In situ assembly of enzyme inhibitors using extended tethering.
Erlanson, D.A., Lam, J.W., Wiesmann, C., Luong, T.N., Simmons, R.L., DeLano, W.L., Choong, I.C., Burdett, M.T., Flanagan, W.M., Lee, D., Gordon, E.M., O'Brien, T.
Nat.Biotechnol.