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The product ofpxcA (formerly known ascotA ) is involved in light-induced Na+ -dependent proton extrusion. In the presence of 2,5-dimethyl-p -benzoquinone, net proton extrusion bySynechocystis sp. strain PCC6803 ceased after 1 min of illumination and a postillumination influx of protons was observed, suggesting that the PxcA-dependent, light-dependent proton extrusion equilibrates with a light-independent influx of protons. A photosystem I (PS I) deletion mutant extruded a large number of protons in the light. Thus, PS II-dependent electron transfer and proton translocation are major factors in light-driven proton extrusion, presumably mediated by ATP synthesis. Inhibition of CO2 fixation by glyceraldehyde in a cytochromec oxidase (COX) deletion mutant strongly inhibited the proton extrusion. Leakage of PS II-generated electrons to oxygen via COX appears to be required for proton extrusion when CO2 fixation is inhibited. At pH 8.0, NO3 − uptake activity was very low in thepxcA mutant at low [Na+ ] (∼100 μM). At pH 6.5, thepxcA strain did not take up CO2 or NO3 − at low [Na+ ] and showed very low CO2 uptake activity even at 15 mM Na+ . A possible role of PxcA-dependent proton exchange in charge and pH homeostasis during uptake of CO2 , HCO3 − , and NO3 − is discussed.

journal of bacteriology

Photosynthetic Electron Transport Involved in PxcA-Dependent Proton Extrusion in Synechocystis sp. Strain PCC6803: Effect of pxcA Inactivation on CO 2 , HCO 3 − , and NO 3 − Uptake