Unit Definition
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One unit of the recombinant human caspases is the enzyme activity that cleaves 1 nmol of the individual caspase substrate (YVAD-pNA for caspase-1, VDVAD-pNA for caspase-2, DEVD-pNA for caspase-3, WEHD-pNA for caspase-4 and -5, VEID-pNA for caspase-6, DEVD-pNA for caspase-7, IETD-pNA for caspase-8 and -10 and LEHD-pNA for caspase-9) per hour at 37°C in a reaction solution containing 50 mM Hepes, pH 7.2, 50 mM NaCl, 0.1% Chaps, 10 mM EDTA, 5% Glycerol, and 10 mM DTT.
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