Abstract
The Dual Role of the Plastid Terminal Oxidase PTOX: Between a Protective and a Pro-oxidant Function.
Highlights
The plastid terminal oxidase (PTOX) is a non-heme diiron quinol oxidase that oxidizes plastoquinol and reduced O2 to H2O
PTOX is localized in the non-appressed regions of the thylakoid membrane (Lennon et al, 2003) and is involved in carotenoid biosynthesis, plastid development, and chlororespiration
Overexpression of PTOX in A. thaliana did not protect against light-induced photodamage (Rosso et al, 2006) and even enhanced photo-oxidative stress in tobacco expressing, in addition to its endogenous enzyme, either PTOX from A. thaliana (Heyno et al, 2009) or PTOX1 from C. reinhardtii (Ahmad et al, 2012)
Summary
The plastid terminal oxidase (PTOX) is a non-heme diiron quinol oxidase that oxidizes plastoquinol and reduced O2 to H2O. Plants grown in moderate light under non-stress conditions have low PTOX concentrations (about 1 PTOX protein per 100 PSII; Lennon et al, 2003).
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