TABLE 2.

Kinetic constants for the flavokinase activities of RibC from Streptomyces davawensis and Bacillus subtilis

RibC	Substrate	Km (μM)	Vmax (U mg−1)a	kcat (s−1)	kcat/Km (μM−1 s−1)
S. davawensis	Riboflavin	40	500	0.3	7.5 × 10−3
	Roseoflavin	30	900	0.5	1.7 × 10−2
B. subtilis	Riboflavin	55	1,200	0.7	1.3 × 10−2
	Roseoflavin	30	600	0.4	1.3 × 10−2

^aSpecific activities (U mg⁻¹) are in nmol min⁻¹ mg⁻¹ protein.