<i>Synechococcus</i> sp. Strain PCC7002 Uses Sulfide:Quinone Oxidoreductase To Detoxify Exogenous Sulfide and To Convert Endogenous Sulfide to Cellular Sulfane Sulfur
Daixi Liu, Jiajie Zhang, Chuanjuan Lü, Yongzhen Xia, Huaiwei Liu, Nianzhi Jiao, Luying Xun, Jihua Liu
Abstract
Cyanobacteria are a major force for primary production via oxygenic photosynthesis in the ocean. A marine cyanobacterium, PCC7002, is actively involved in sulfide metabolism. It uses SQR to detoxify exogenous sulfide, enabling it to survive better than its Δ sqr mutant in sulfide-rich environments. PCC7002 also uses SQR to oxidize endogenously generated sulfide to S 0 , which is required for the proper expression of key genes involved in photosynthesis. Thus, SQR has at least two physiological functions in PCC7002. The observation provides a new perspective for the interplays of C and S cycles.
Topics & Concepts
SulfideCyanobacteriaPhotosynthesisChemistrySulfurCarbon fixationSynechococcusBiochemistryPolysulfideSulfur metabolismMetabolismBiologyBacteriaOrganic chemistryGeneticsPhysical chemistryElectrolyteElectrodeMarine and coastal ecosystemsMicrobial Community Ecology and PhysiologyIsotope Analysis in Ecology