Team:UANL Mty-Mexico/Modelling/Parameters

The OmpR phosphorylation is expressed through the following expressions adapted from Srividhya and Krishnaswamy, (2006), reference E:

IMAGEN

OmpR-P dephosphorylation rate (from Qin, L, et al., 2001, reference F): 17 min when red light is present / 56 min when far-red light is present.

For simplicity just the parameters of the LasI/LasR quorum sensing system are shown, because they are supposed to be equivalent according to the used general Quorum Sensing model.

Following the recommendations of team Peking 2009, we set all mRNAs half-lives to 4.4 min and, supposing that all regulatory and reporter gene would have an LVG tag attached, all protein half-lives were set to 40 min, with the exception of phosphorylated OmpR, whose case is exposed on the last sections.

Considering a cell division rate of 30 min, then, the degradation rates for mRNA are: 1/4.4 + 1/30 min, and the protein degradation rates are: 1/40 + 1/30 min.

1. https://2009.igem.org/Team:PKU_Beijing/Modeling/Parameters
2. Schuster, M, et al., (2004), Promoter specificity in Pseudomonas aeruginosa quorum sensing revealed by DNA binding of purified LasR, Proc. NatL Acad. Sci. USA, Vol. 101, pp. 15833–15839.
3. Goryachev, AB, et al., (2005), Systems analysis of a quorum sensing network: Design constraints imposed by the functional requirements, network topology and kinetic constants. Biosystems, pp. 178-87.
4. Ackers, GK, et al., (1982), Quantitative model for gene regulation by A phage repressor, Proc. NatL Acad. Sci. USA, Vol. 79, pp. 1129-1133.
5. Srividhya and Krishnaswamy, (2004), A simulation model of Escherichia coli osmoregulatory switch using E-CELL system, BMC Microbiology, 4:44
6. Qin, L, et al., (2001), The critical role of DNA in the equilibrium betweenOmpR and phosphorylated OmpR mediated by EnvZ in Escherichia coli, PNAS, Vol. 98, No. 3, pp. 908-913.