A 27-amino acid, cell-permeable peptide encoded by exon 1B of human calpastatin that acts as a potent inhibitor of calpain I and calpain II (IC₅₀ = 20 nM for purified rabbit calpain II). Does not inhibit either papain or trypsin. Blocks the down-regulation of protein kinase C_ε (PKC_ε) in rat pituitary GH₄C₁ cells stimulated by thyrotropin-releasing hormone (TRH).

A 27-amino acid, peptide encoded by exon 1B of human calpastatin that acts as a cell-permeable and potent inhibitor of calpain I and calpain II (IC₅₀ = 20 nM for purified rabbit calpain II). Does not inhibit either papain or trypsin. Blocks the down-regulation of protein kinase C_ε (PKC_ε) in rat pituitary GH4C1 cells stimulated by thyrotropin-releasing hormone (TRH).

Cell permeable: yes

Primary Target
calpain 2

Product does not compete with ATP.

Reversible: no

Target IC₅₀: 20 nM against calpain II

Toxicity: Standard Handling (A)

Ac-Asp-Pro-Met-Ser-Ser-Thr-Tyr-Ile-Glu-Glu-Leu-Gly-Lys-Arg-Glu-Val-Thr-Ile-Pro-Pro-Lys-Tyr-Arg-Glu-Leu-Leu-Ala-NH₂

Supplied as a trifluoroacetate salt.

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.

Eto, A., et al. 1995. J. Biol. Chem. 270, 25115.
Kawasaki, J., et al. 1989. J. Biochem. 106, 274.
Maki, M., et al. 1989. J. Biol. Chem. 264, 18866.

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany