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Ultrasensitive responses are common in cellular information transfer because they allow cells to decode extracellular stimuli in an all‐or‐none manner. Biochemical responses are usually analyzed by fitting the Hill equation, and the estimated Hill coefficient is taken as a measure of sensitivity. However, this approach is not appropriate if the response under consideration significantly deviates from the best‐fit Hill equation. In addition, Hill coefficients greater than unity do not necessarily imply ultrasensitive behaviour if basal activation is significant. In order to circumvent these problems we propose a general method for the quantitative analysis of sensitivity, the relative amplification plot, which is based on the response coefficient defined in metabolic control analysis. To quantify sensitivity globally (i.e. Over the whole stimulus range) we introduce the integral‐based relative amplification coefficient.
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Our relative amplification approach can easily be extended to monotonically decreasing, bell‐shaped or nonsaturated responses. In cellular signal transduction, a stimulus (e.g. An extracellular hormone) brings about intracellular responses such as transcription.
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These responses may depend on the extracellular hormone concentration in a gradual or an ultrasensitive (i.e. All‐or‐none) manner. In gradual systems, a large relative increase in the stimulus is required to accomplish large relative changes in the response, while a small relative alteration in the stimulus is sufficient in ultrasensitive systems.
Ultrasensitive responses are common in cellular information transfer [ -] as this allows cells to reject background noise, while amplifying strong inputs [, ]. In addition, ultrasensitivity embedded in a negative‐feedback loop may result in oscillations [ ], while bistability can be observed in combination with positive feedback [, ]. Surprisingly, ultrasensitive signalling cascades equipped with negative feedback may also exhibit an extended linear response [ ]. Finally, spatial gradients known to be important in development can be converted to sharp boundaries if they elicit ultrasensitive responses [ ]. Previous theoretical work has demonstrated that ultrasensitivity in the fundamental unit of signal transduction, the phosphorylation–dephosphorylation cycle, can arise if the catalyzing enzymes operate near saturation [ ] and/or if an external stimulus acts on both the phosphorylating kinase and the dephosphorylating phosphatase in opposite directions [, ].
In addition, multisite phosphorylation [ ], stoichiometric inhibition [ ], regulated protein translocation [ ] and cascade amplification effects [ ] have been shown to contribute to ultrasensitive behaviour in more complex systems. Biochemical responses are usually analyzed by fitting the Hill equation, and the estimated Hill coefficient is taken as a measure of sensitivity. However, this approach is not appropriate if the response under consideration significantly deviates from the best‐fit Hill equation.