A peptide that contains the N-terminal seven residues of Smac (Second Mitochondria-derived Activator of Caspases, also known as DIABLO) and promotes procaspase-3 activation at around 10 µM. Reported to bind to the BIR2 and BIR3 (baculovirus IAP repeat) domains of XIAP (X-linked inhibitor of apoptosis proteins) with a K_d ~800 nM. Promotes the catalytic activity of caspase-9 in the presence of XIAP, suggesting that Smac competes with caspase-9 for binding to the same pocket on the surface of XIAP.

Cell permeable: no

Kd ~800 nM in binding to the BIR2 and BIR3 (baculovirus IAP repeat) domains of XIAP (X-linked inhibitor of apoptosis proteins)

Primary Target
Promotes the catalytic activity of caspase-9 in the presence of XIAP

Product does not compete with ATP.

Reversible: no

Packaged under inert gas

Supplied as a trifluoroacetate salt.

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.

H-Ala-Val-Pro-Ile-Ala-Gln-Lys-OH

Srinivasula, S.M., et al. 2001. Nature410, 112.
Chai, J., et al. 2000. Nature406, 855.
Liu, Z., et al. 2000. Nature408, 1004.
Srinivasula, S.M., et al. 2000. J. Biol. Chem.275, 36152.

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

Toxicity: Standard Handling (A)