Photochemical action spectra indicate that cytochrome a/a3 is the predominant haemoprotein terminal oxidase in Acanthamoeba castellanii

Scott, Robert I. and Lloyd, David ORCID: https://orcid.org/0000-0002-5656-0571 1983. Photochemical action spectra indicate that cytochrome a/a3 is the predominant haemoprotein terminal oxidase in Acanthamoeba castellanii. Biochemical Journal 210 (3) , -. 10.1042/bj2100721

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Abstract

1. Room-temperature CO-reduced minus reduced difference spectra of intact cells of Acanthamoeba castellanii show the presence of CO-reacting haemoproteins in cells from the early-exponential, late-exponential and stationary phases of growth. 2. The relative rates of reaction with CO of the two haemoproteins differ; that of cytochrome a/a3 with CO is complete within 1 min of bubbling with CO, whereas that of cytochrome b takes longer than 90 min. 3. Photochemical action spectra reveal cytochrome a/a3 as the predominant haemoprotein oxidase at all stages of growth. 4. It is concluded that the alternative oxidases known to be present in these organisms are not cytochromes.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Biosciences
ISSN:	0264-6021
Last Modified:	26 Oct 2022 08:38
URI:	https://orca.cardiff.ac.uk/id/eprint/127948

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