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. 2010 Jun 25;192(17):4275–4280. doi: 10.1128/JB.00367-10

TABLE 1.

Kinetic parameters for the polymerization reactions in the presence or absence of ppGpp^a

ppGpp concn (mM)	Mean ± SEM						k_cat/K_m (l mol⁻¹ min^−l, 10³)
	K_m (mM)			k_cat (min⁻¹)			k_cat/K_m (l mol⁻¹ min^−l, 10³)
	S. antibioticus	S. coelicolor	E. coli	S. antibioticus	S. coelicolor	E. coli	S. antibioticus	S. coelicolor	E. coli
0	1.46 ± 0.12	6.14 ± 0.43	14.6 ± 1.2	80.5 ± 2.9	492 ± 43.4	731 ± 224	55.1	80.1	50.1
0.5	4.24 ± 0.77	4.68 ± 0.32	12.6 ± 2.0	59.1 ± 6.5	141 ± 14.1	672 ± 179	13.9	30.1	53.3
1.0	2.78 ± 0.26	3.96 ± 0.68	-	21.2 ± 4.2	59.3 ± 6.7	-	7.6	15.0

^a

The K_m and k_cat data are averages of two sets of duplicates.