Table 3. Yield of soluble protein, specific activity and kinetic parameters for the hydrolysis of methyl parathion by OpdA expressed in the presence (+) or absence (−) of CoCl₂.

Protein	Activity (μM/min per μl of culture)	Soluble protein (mg/l)	Specific activity (units/mg)	kcat (s−1)	Km (M)	kcat/Km (s−1·M−1)
OpdA+Co2+	1.94±0.12	4.9	168±3	1180±80	3.6×10−4±0.6×10−4	3.3×106±0.8×106
OpdA−Co2+	0.14±0.01	1.8	34±1	255±16	4.1×10−4±0.6×10−4	6.3×105±1.3×105