Sulfide quinone reductase (SQR) activity in Chlorobium

[摘要]

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].

[学科分类] 生物化学/生物物理

[关键词] Sulfide oxidation;Quinone reductions;Electron transport;Photosynthesis;Chlorobium limicola;SQR;sulfide-quinone reductase;MQ;menaquinone;PQ-1(-2);plastoquinone-1(-2);UQ-1(-2);ubiquinone-1(-2);NQNO;2-n-nonyl-4-hydroxyquinoline-N-oxide;UHDBT;5-n-undecyl-6-hydroxy-4;7-dioxobenzothiazole;DNP-INT;2-iodo-6-isopropyl-3-methyl-2′-4;4′-trinitrodiphenyl ether;DCMU;3-(3′;4′-dichlorophenyl)-1;1-dimethylurea;Bchl c;bacteriochlorophyll c