Table 1. Steady-state kinetic constants for FPS1S and FPS2.

Variable substrate	Kinetic parameter	FPS1S	FPS2
IPP	K m (μM)	23.1±0.4	31.3±0.5
	kcat (min−1)	62.5	269.0
	kcat/K m (min−1μM−1)	2.7	8.6
DMAPP	K m (μM)	22.7±2.1	31.5±0.5
	kcat (min−1)	52.2	197.3
	kcat/K m (min−1μM−1)	2.3	6.2
GPP	K m (μM)	8.3±1.2	11.3±1.0
	kcat (min−1)	36.4	132.8
	kcat/K m (min−1μM−1)	4.4	11.7

The K _m mean values and SE were calculated from three independent experiments.

k_cat values were calculated for the dimeric form of the enzyme.