TABLE 2.

Parameters for transcription and translation

	recA	lexA	umuD	umuC	uvrB
kSL1	1	1	1	1	1
kSL2*	33	470	27	27	175
ktc†	1.19	0.079	0.18	0.07	0.0593
kdm‡	0.0034	0.0021	0.0018	0.0014	0.0035
ktr§	0.9	0.03	0.18	0.038	0.13
kdp¶	0.001	0.000231	0.0023	0.0019	0.001
mRNA basal level‖	8	10	2	1	2
Protein basal level**	7200	1300	200	20	250

^*k_SL2 is determined by fitting mRNA microarray data in Courcelle et al. (5).

^†The transcription rates are determined by mRNA degradation rate k_dm and mRNA basal level.

^‡The half-lives of mRNAs in E. coli are derived from Bernstein et al. (56).

^§The translation rates are determined by the protein degradation rate k_dp and the protein basal level.

^¶The half-life of LexA is derived from Sassanfar and Roberts (10); the half-lives of UmuD and UmuC are derived from Frank et al. (40); the half-lives of RecA and UvrB are determined by fitting Fig. 4, e and f, respectively.

^‖The relative abundance of mRNA molecules is derived from Bernstein et al. (56).

^**The protein basal levels are derived from the following references: RecA and LexA (10); UmuD and UmuC (48); UvrB (31).