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In almost all cyanobacteria a small gene family encodes the photosystem II reaction center D1 proteins that play vital roles in the cell. Recently, several types of this protein were functionally characterised and the conditions for their transcript regulation were identified. One of the D1-encoding genes previously believed to be silent is induced by microaerobic conditions. This gene was first described in  Synechocystis  sp. PCC 6803 as  psbA1  encoding the D1 isoform. When  Synechocystis  cells are shifted from high to ambient level CO 2  we recorded an increase in gene expression, similar, but to a lesser extent, to microaerobic conditions. When synthetic air is used to remove the ambient CO 2 , the induction of the gene is absent. We documented for the first time that expression of a  psbA  gene is regulated by the inorganic carbon status of the cell. Our conclusion is that both CO 2  and microaerobic conditions are independently influencing the expression of  psbA1  gene in  Synechocystis  sp. PCC 6803. Hence, it is crucial to understand the mechanisms of regulation and function of D1 proteins as it could be used for future bio-technological applications as a virtual tool-box for modulating the function of PSII.

Expression of psbA1 gene in Synechocystis sp. PCC 6803 is influenced by CO 2