Using this model, we can show that the phosphorylated ComE* is proportional to both initial concentration of AIP and ComD.
If the initial concentration of AIP or ComD is zero, there is no formation of ComE*.
We are assuming an initial concentration of Phosphate and ComE of 100nM.
If we change either [AIP]0 or [ComE]0, then the final concentration of ComE* will always tend towards 5×10-11M. [ComE*]final will always tend towards this value, unless the initial concentrations of Phosphate and ComE are changed. However, if we increase both [AIP]0 and [ComE]0 at the same time, then [ComE*]final will be reached much faster (i.e. slope increases).
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