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

Lloyd, David ORCID: https://orcid.org/0000-0002-5656-0571, 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:	26 Oct 2022 08:34
URI:	https://orca.cardiff.ac.uk/id/eprint/127818

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