TABLE 1.

The kinetic rate constants

k₁ and k₋₁ describe a concentration-independent step of monomer activation when assembly is initiated by the addition of NTP. All subsequent rate constant pairs are equal to k_e and k_−e and describe the steps of elongation.

	ATP, 150 mm KCl	GTP, 150 mm KCl	ATP, 350 mm KCl	GTP, 350 mm KCl
k1 (s−1)	0.021	0.008	0.005	0.003
k−1 (s−1)	0.164	0.093	0.077	0.028
ke (μm−1s−1)	0.099	0.058	0.242	0.145
k−e (μm−1 s−1)	0.012	0.016	0.054	0.033