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Cytochrome a620 in Tetrahymena pyriformis: Reactions with carbon monoxide and oxygen at subzero temperatures and photochemical action spectra

Lloyd, David, Scott, Robert I., Edwards, Steven W., Edwards, Clive and Chance, Britton 1982. Cytochrome a620 in Tetrahymena pyriformis: Reactions with carbon monoxide and oxygen at subzero temperatures and photochemical action spectra. Biochemical Journal 206 (2) , pp. 367-372. 10.1042/bj2060367

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Abstract

1. Mitochondria-enriched fractions of the ciliate protozoan Tetrahymena pyriformis ST contained CO-reacting cytochromes b560 and a620. 2. A non-photodissociable oxygen-containing compound of cytochrome a620 was formed in whole cell suspensions at −114 degrees C after photolysis of CO in the presence of 200 microM-O2. 3. Electron transport, indicated by the oxidation of cytochrome a620 and cytochrome c, occurred at temperatures higher than −72 degrees C. 4. Photochemical action spectra for the relief of respiratory inhibition of whole cells by CO obtained by using a liquid dye laser indicate that the only CO-reacting terminal oxidase detectable was cytochrome a620. 5. It is concluded that the alternative electron transport chains in this organism utilize non-cytochrome terminal oxidases.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Portland Press Limited
ISSN: 0264-6021
Date of Acceptance: 14 May 1982
Last Modified: 06 Mar 2020 14:00
URI: http://orca.cf.ac.uk/id/eprint/127818

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