Related Experiment Video
Updated: Aug 9, 2026

Development of Sulfidogenic Sludge from Marine Sediments and Trichloroethylene Reduction in an Upflow Anaerobic Sludge Blanket Reactor
Published on: October 15, 2015
Sulfide quinone reductase (SQR) activity in Chlorobium
1Biochemistry Department, Weizmann Institute of Science, Rehovot, Israel.
Abstract:
Membranes of the green sulfur bacterium, Chlorobium limicola f. thiosulfatophilum, catalyze the reduction of externally added isoprenoid quinones by sulfide. This activity is highly sensitive to stigmatellin and aurachins. It is also inhibited by 2-n-nonyl-4-hydroxyquinoline-N-oxide, antimycin, myxothiazol and cyanide. It is concluded that in sulfide oxidizing bacteria like Chlorobium, sulfide oxidation involves a sulfide-quinone reductase (SQR) similar to the one found in Oscilatoria limnetica [Arieli, B., Padan, E. and Shahak, Y. (1991) J. Biol. Chem. 266, 104-111].
Related Concept Videos
Preparation and Reactions of Sulfides
Electron Transport Chain: Complex III and IV
Anoxygenic Photosynthesis
Sulfur Assimilation
Anoxygenic Phototrophic Bacteria
Microbes and the Sulfur Cycle

