Table 1. Competition of Pol IIIcore and Pol IV.

	Concentration (nM)		Polymerase exchange (%)*			Lag time (s)†	Lifetime (s)‡
Competition	Pol IIIcore	Pol IV	III→IV	IV →III	III + IV	III→IV	Pol IIIcore
Pol IIIcore - Pol IV	30	6	81	12	7	32.5 ± 4.6	16.3 ± 1.0
	30	30	70	22	9	20.3 ± 3.5	15.7 ± 1.1
	30	150	63	20	15	5.9 ± 0.5	16.6 ± 1.7
	150	150	51	24	26	3.5 ± 0.2	16.0 ± 0.9
τ-complex§ - Pol IV	30#	30	95	0	5	11.3 ± 1.3	14.8 ± 0.9

*Polymerase exchange observed on clamp-DNA showing the exchange from Pol IIIcore to Pol IV (III→IV), Pol IV to Pol IIIcore (IV→III), or co-localization of Pol IIIcore and Pol IV (III + IV).

^†Time between Pol IIIcore release and Pol IV arrival.

^‡Lifetime on clamp-DNA.

^§τ-complex consists of τ clamp loader (τ₃δ₁δ'₁) and three Pol IIIcore complexes (α, ε, θ).

^#Concentration of Pol IIIcore.