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The cytochrome c550-deficient mutant (psbV-disruptant) of Synechocystis requires a high concentration of Cl(-) in the culture medium to support photosynthetic oxygen evolution. From this disruptant, we isolated spontaneous suppressor mutants that are able to grow photoautotrophically in the absence of Cl(-). Three independent mutations were identified: one was a deletion in slr0753 and two were a transposition of related insertion sequences in the same slr0753. The deduced product of slr0753 belongs to a novel group of the superfamily of ion efflux pumps and ion transporters. These results suggest that Slr0753 exports Cl(-) or a related anion, which is essential for PSII oxygen evolution.

Mutations in a Putative Chloride Efflux Transporter Gene Suppress the Chloride Requirement of Photosystem II in the Cytochrome c550-deficient Mutant