Unit Definition
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One unit of the recombinant human caspase-3, -6, -7, and -8 is the enzyme activity that cleaves 1 nmol of the caspase substrate DEVD-pNA, VEID-pNA, DEVD-pNA, and IETD-pNA, respectively, 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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