The reaction mixture contained 1 mg/mL DMC, 15 mM MDC, 70 mM
Tris–Cl (pH 7.5), 5 mM CaCl2, 3 mM DTT and 100 mL of crude enzyme. The
reaction was performed at 37C for 10 min. EDTA was added to contain a final
concentration of 20 mM in order to stop the reaction.