Table 3.

Apparent kinetic parameters of dihydropirimidinases from different organisms with the substrate 5,6-dihydrouracil.

Kmapp (mM)	apparent specific activity (µmol min-1 mg-1)	kcatapp (s-1)	kcatapp/Kmapp (s-1 M-1)	Organism
0.008	10.3	9.7	1.2 x 106	Bos taurus 1*
0.019	14.8	13.3	7.0 x105	Rattus norvegicus2**
0.30 ± 0.04	1.10 ± 0.05	1.07± 0.04	3.55 x 103	Oryza sativa3** (OsDHP-T1)

¹ Brooks et al. (1983). ² Kikugawa et al. (1994). ³This work. *Activity was measured at 30°C. **Activity was measured at 37°C.