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Background  The  dspA  ( hik33 ) gene, coding for a putative sensory histidine kinase, is conserved in plastids ( ycf26 ) and cyanobacteria. It has been linked with a number of different stress responses in cyanobacteria.    Results  We constructed an insertional mutant of  dspA  ( ycf26)  in  Synechocystis  6803. We found little phenotypic effect during nitrogen starvation. However, when the mutation was combined with deletion of the  pta  gene coding for phosphotransacetylase, a more significant phenotype was observed. Under nitrogen starvation, the  pta/dspA  double mutant degrades its phycobilisomes less than the wild type and still has about half of its chlorophyll-protein complexes.    Conclusion  Our data indicates that acetyl-phosphate-dependent phosphorylation of response regulator(s) overlaps with DspA-dependent signalling of the degradation of chlorophyll-protein complexes (and to a lesser extent phycobilisomes) in  Synechocystis  6803.

The influence of acetyl phosphate on DspA signalling in the Cyanobacterium Synechocystis sp. PCC6803