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Inhibition of Oxygen Utilization and Destruction of Ubiquinone by Ultraviolet Irradiation of Thiobacillus thiooxidans1

By Frank W. Adair


Ultraviolet (UV) irradiation inhibited sulfur oxidation by cells of Thiobacillus thiooxidans. Sulfur-oxidizing activity decreased as the exposure time to UV light increased. A loss of the ability of cells of fix CO2 paralleled the loss of sulfur-oxidizing activity. UV light photoinactivated ubiquinone purified from T. thiooxidans. The same percentage of sulfur-oxidizing activity and ubiquinone was destroyed after 15 min of UV exposure. Both the photoinactivation of sulfur oxidation and ubiquinone followed first-order reaction kinetics. The specific rate constants for both photoinactivations were nearly equal. Cells completely inactivated by UV light contained no ubiquinone. Ubiquinone was found to be a component of the cell wall-membrane complex

Topics: Microbial Physiology and Metabolism
Year: 1968
OAI identifier: oai:pubmedcentral.nih.gov:251984
Provided by: PubMed Central
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