Chemical sensing by nonequilibrium cooperative receptors

Abstract

Cooperativity arising from local interactions in equilibrium receptor systems provides gain, but does not increase sensory performance, as measured by the signal-to-noise ratio (SNR) due to a fundamental tradeoff between gain and intrinsic noise. Here we allow sensing to be a nonequilibrium process and show that energy dissipation cannot circumvent the fundamental tradeoff, so that SNR is still optimal for independent receptors. For systems requiring high gain, nonequilibrium 2D-coupled receptors maximize SNR, revealing a new design principle for biological sensors.

References in corpus (2)

• Fluctuations and response of nonequilibrium states
• Relationship between Thermodynamic Driving Force and One-Way Fluxes in Reversible Chemical Reactions

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