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Nonadaptive Fluctuation in an Adaptive Sensory System: Bacterial Chemoreceptor

Figure 1

Two-state adaptive sensory model.

A schematic of the two-state adaptive sensory model. The signaling molecule in the modified state has active and inactive states. The transition rates between them are dependent on ligand concentration. The activity is the number of active molecules, which is the output for downstream systems. If the transition rates between the modified and unmodified states are dependent solely on , a perfect adaptation is achieved (see text). In the case of a bacterial chemoreceptor, the signaling molecule is a receptor, and the modification and demodification reactions are catalyzed by enzymes CheR and CheB respectively.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0011224.g001