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. 2008 May 2;4(5):e1000038. doi: 10.1371/journal.pcbi.1000038

Table 2. CGGR variables, parameters and constants.

Genetic Parameters units
Inline graphic Maximum transcription initiation rate of the i-th gene class 1/min
Inline graphic Maximum translation initiation rate of the i-th gene class mRNA 1/min
Km,i Binding affinity of RNAp holoenzyme to the i-th gene class promoter 1/(µm)3
Lm,i Binding affinity of the 30S ribosome subunit to the i-th gene class mRNA RBS 1/(µm)3
tc,i Average time to transcribe the i-th gene class ( = Li/ci) min
tl,i Average time to translate the mRNA of the i-th gene class ( = Li/3cp) min
mi,j Map location of the j-th gene in the i-th gene class dimensionless
Inline graphic Functional half-life for the i-th gene class mRNA in the absence of ribosomes min
Vini Initiation volume (µm)3
Cell state variables
nRNAp Concentration of total RNAp 1/(µm)3
nRNAp,free Concentration of free functional RNAp 1/(µm)3
nribo Concentration of total ribosomes 1/(µm)3
nribo,free Concentration of free functional (30S) ribosomes 1/(µm)3
nbulk Concentration of bulk protein 1/(µm)3
α Specific growth rate (α = μ·ln(2), where μ is the doubling rate) 1/min
Parameters and constants for the unconstrained CGGR
cribo/load Production cost of one ribosome or load protein dimensionless
n0 Minimum cell density 1/(µm)3
Parameters and constants for the constrained CGGR
Mbulk Bulk protein cutoff 1/(µm)3
Inline graphic Maximal elongation rate aa/min
h Hill coefficient dimensionless
Other parameters, variables and constants
cp Peptide chain elongation rate aa/min
ci RNA chain elongation rate of the i-th gene class bp/min
C C period min
di Gene concentration of the i-th gene class 1/(µm)3
Li Length of the i-th gene class base pairs
vk Volume of a macromolecule belonging to the k-th species (µm)3
Φ Macromolecule volume fraction = Vmacro/Vcell dimensionless

Genetic parameters, cell state variables, and other variables and constants associated with the CGGR models. Gene classes labeled by index i include: rrn, r-protein, bulk protein and any load genes.