From: On the control mechanisms of the nitrite level in Escherichia coli cells: the mathematical model
Parameter | Parameter name | Parameter value | Sub system | Estimation source |
---|---|---|---|---|
k flow | the flow rate constant | 1.65 · 10−4 s−1 | (1) | [1] |
δ nrf, 1 | parameters of the m nrf generalized function that describes the nrf operon activity changes in relation to the nitrite concentration established in the chemostat | 60 | (6) | |
K nrf ,1 | 0.36 mM | |||
h nrf ,1 | 1.3 | |||
δ nrf, 2 | 0.16 | |||
K nrf ,2 | 1.7 mM | |||
h nrf ,2 | 3.0 | |||
ks Nrf | the maximum specific rate of the NrfA and NrfB proteins synthesis | 1.13 10−5 mM/s | (6) | [*]b |
ks NirC | the maximum specific rate of the NirC potein synthesis | 7.3 · 10−5 mM/s | (6) | |
| the maximum specific rate of the NirB and NirD proteins synthesis |
| (6) | |
k d , Nrf | the rate constant for the NrfA and NrfB monomers degradation in cytoplasm | 9.6 10−5 s−1 | (11) | [29] |
kt Nrf , cp | the rate constant for the NrfA and NrfB passage into the periplasm | 0.01 s –1 | (7) | [*]b |
kt Nrf , pc | the rate constant for the NrfA and NrfB transport into the cytoplasm | 10 s –1 | (7) | |
k dis , NrfAB | the rate constant for the NrfAB dimer dissociation into subunits | 10 s –1 | (9) | |
K dis , NrfAB | the equilibrium dissociation constant for the NrfAB dimer | 0.00004 mM | (9) | [18] |
| the rate constant for the Nrf(AB)2 dissociation into two NrfAB dimer proteins | 10 s –1 | (9) | |
| the equilibrium dissociation constant for the NrfA2B2 tetramer | 0.004 mM | (9) | |
δ peripl | the constant for the cytoplasmic volume to periplasmic volume ratio | 6 | (7) | [25] |
d U | parameters of the U generalized function that describes membrane potential relative value in relation to the added NO2 | 3 | (7) | [16] |
δ | 0.015 | |||
K pmf ,1 | 0.115 mM | |||
h pmf ,1 | 2 | |||
K pmf ,2 | 0.83 mM | |||
h pmf ,2 | 17 | |||
ω 1, ω 2 с | 0с | (7) | [*]b | |
K pmf ,3 с | 2.2 | |||
h pmf ,3 с | 15 | |||
k d , NrfA | the rate constant for the NrfA monomer degradation in cytoplasm | 9.6 10−6 sec –1 | (11) | [29] |
k d , NrfA | the rate constant for the NrfA monomer degradation in the periplasm | |||
k d , NrfAB | the rate constant for the NrfAB degradation | |||
| the rate constant for the NrfA2B2 degradation | |||
| the rate constant for the NrfA reductase turnover | 700 s –1 | (2) | [9] |
| the NrfA reductase Michaelis constant for nitrite | 0.03 mM | [10] | |
δ nir, 1 | parameters of the m nir generalized function that describes the nir operon activity changes in relation to the nitrite concentration established in the chemostat | 7.86 | (6) | |
K nir ,1 | 1.0 mM | |||
h nir ,1 | 2.0 | |||
δ nir, 2 | 5.76 | |||
K nir ,2 | 1.7 mM | |||
h nir ,2 | 8.3 | |||
| the equilibrium dissociation constant for the NirB2 association reaction | 0.002 mM | (10) | [*]b |
| the equilibrium dissociation constant for the NirB2D trimer association reaction | 0.002 mM | (10) | |
| the rate constant for the NirB enzyme catalytic turnover | 1100.0 s –1 | (5) | [*]b |
| assumed to be equal the NirB reductase Michaelis constant | 0.006 mM | [21] | |
| the rate constant for the NirC5 dissociation | 0.0475 mM | (8) | [*]b |
k cat , NirCin | the rate constant for nitrite import by the NirC protein | 100 s –1 | (3) | [*]b |
| assumed to be equal the Michaelis constant for nitrite import by the NirC protein | 1 mM | (3) | [31] |
k cat , NirCout | the rate constant for the nitrite export by the NirC protein | 1000 s−1 | (4) | [*]b |
| assumed to be equal the Michaelis constant for the nitrite export by the NirC protein | 1 mM | (4) | [31] |
k d,NirC | the rate constant for the NirC monomer degradation | 0.0011 s−1 | (11) | [*]b |
k d,NirC5 | the rate constant for the NirC5 pentamer degradation | 0.00011 s−1 | ||
k d,NirB | the rate constant for the NirВ monomer degradation | 0.00011 s−1 | ||
k d,NirD | the rate constant for the NirD monomer degradation | 0.00011 s−1 | ||
k d,NirB2 | the rate constant for the NirВ2 dimer degradation | 0.000011 s−1 | ||
k d,NirB2D | the rate constant for the NirВ2D dimer degradation | 0.000011 sec−1 | ||
C | cell volume relative fraction in chemostat | 0.0003 | (2, 3) |