<i>Synechococcus</i> sp. PCC 7002 Performs Anoxygenic Photosynthesis and Deploys Divergent Strategies to Cope with H₂S_n and H₂O₂.

ABSTRACT: Oxygenic and anoxygenic photosynthesis have long been considered defining traits of cyanobacteria. However, whether the important cyanobacterial genus Synechococcus is capable of anoxygenic photosynthesis remains unconfirmed. Here, we report that Synechococcus sp. PCC 7002 is capable of anoxygenic photosynthesis when sulfide (H₂S) is supplied as the sole electron donor. Combining the targeted deletion of the sulfide: quinone oxidoreductase gene (Δsqr) with 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) mediated the inhibition of photosystem II. We demonstrated that SQR-mediated H₂S oxidation sustains light-dependent CO₂ fixation in the absence of O₂ evolution. Our genome-wide transcriptomic profiling further revealed that pol

SUBMITTER: Wang Y 

PROVIDER: S-EPMC12466478 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature