A plastid terminal oxidase associated with carotenoid desaturation during chromoplast differentiation.
作者： Eve-Marie Josse , Andrew J. Simkin , Joël Gaffé , Anne-Marie Labouré , Marcel Kuntz
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摘要: The Arabidopsis IMMUTANS gene encodes a plastid homolog of the mitochondrial alternative oxidase, which is associated with phytoene desaturation. Upon expression in Escherichia coli, this protein confers detectable cyanide-resistant electron transport to isolated membranes. In assay activity sensitive n-propyl-gallate, an inhibitor oxidase. This appears be terminal oxidase (PTOX) that functionally equivalent quinol:oxygen oxidoreductase. was immunodetected achlorophyllous pepper (Capsicum annuum) chromoplast membranes, and corresponding cDNA cloned from tomato (Lycopersicum esculentum) fruits. Genomic analysis suggests presence single these organisms, parallels desaturase zeta-carotene during fruit ripening. Furthermore, PTOX impaired ghost mutant, accumulates leaves These data show also participates carotenoid desaturation chromoplasts addition its role early chloroplast development.
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