Table 1.

k_cat (min⁻¹) and K_m (μM) values for NTP-G6 and dNTP-G4 with GTP and dGTP

Species	kcat		Km		Selectivity
	dGTP	GTP	dGTP	GTP
NTP-G6	2.74  ×  10−5	1.46  ×  10−3	918	425	115
dNTP-G4	4.43  ×  10−4	1.90  ×  10−5	98	106	26

Values were calculated with the Michaelis-Menten equation by using the data presented in Fig. 3, and each is the average of two replicate experiments. Selectivity is the ratio of the k_cat/K_m values with GTP and dGTP.