Figure 1.

Schematic diagram of the aerotaxis mechanism proposed by Rebbapragada et al. (6). The recently identified sensor Aer (depicted here as a dimer by analogy to the oligomeric structure of chemoreceptors) and the serine chemoreceptor Tsr mediate taxis responses to oxygen, redox effectors, and glycerol, substances that modulate electron transport and proton motive force. Homologous signaling domains relay information to the cytoplasmic phosphotransfer signaling components CheW, CheA, and CheY.