FIGURE 6.

Relative hydrogenase activity of Synechocystis sp. PCC 6803 hox mutants. Whole cells of Synechocystis sp. PCC 6803 WT and hox⁻ mutant strains were analyzed for hydrogenase activity with the exogenous electron donor MV. The graph shows MV-linked activities of hox mutants relative to WT with assay variation depicted by error bars. Rates (nmol of H₂ ml⁻¹ min⁻¹) are presented in supplemental Table 1.