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Significance Life on Earth depends on photosynthetic CO2 fixation to form organic carbon. This process evolved in cyanobacteria and was later conveyed to eukaryotes, giving rise to plastids in algae and plants. To cope with low atmospheric CO2 concentrations that developed over the course of evolution, cyanobacteria evolved a CO2 -concentrating mechanism (CCM), which elevates CO2 levels in the vicinity of RubisCO, the key enzyme of CO2 fixation. Here we describe a conserved cyclic AMP receptor protein, SbtB, which participates in the sensing of fluctuating Ci levels to regulate the cyanobacterial CCM system. SbtB represents a new principle of Ci sensing, which is important for acclimation to varying Ci regimes in the ecological niches of cyanobacteria.

P II -like signaling protein SbtB links cAMP sensing with cyanobacterial inorganic carbon response

P _II -like signaling protein SbtB links cAMP sensing with cyanobacterial inorganic carbon response