Phototaxis and impaired motility in adenylyl cyclase and cyclase receptor protein mutants of Synechocystis sp strain PCC 6803

We have carefully characterized and reexamined the motility and phototactic responses of Synechoeystis sp. adenylyl cyclase (Cya1) and catabolite activator protein (SYCRP1) mutants to different light regimens, glucose, 3-(3,4-dichlorophenyl)-1,1-dimethylurea, and cyclic AMP. We find that contrary to earlier reports, cya1 and sycrp1 mutants are motile and phototactic but are impaired in one particular phase of phototaxis in comparison with wild-type Synechoeystis sp.