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Plant Physiol, August 2000, Vol. 123, pp. 1427-1436
A Plastid Terminal Oxidase Associated with Carotenoid
Desaturation during Chromoplast Differentiation1
Eve-Marie
Josse,
Andrew J.
Simkin,
Joël
Gaffé,
Anne-Marie
Labouré,
Marcel
Kuntz,* and
Pierre
Carol
Laboratoire de Génétique Moléculaire des Plantes,
Université Joseph Fourier and Centre National de la Recherche
Scientifique (Unité Mixte de Recherche 5575), BP53, 38041 Grenoble cedex 9, France
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 a detectable cyanide-resistant
electron transport to isolated membranes. In this assay this activity
is sensitive to n-propyl-gallate, an inhibitor of the
alternative oxidase. This protein appears to be a plastid terminal
oxidase (PTOX) that is functionally equivalent to a quinol:oxygen
oxidoreductase. This protein was immunodetected in achlorophyllous
pepper (Capsicum annuum) chromoplast membranes, and a
corresponding cDNA was cloned from pepper and tomato
(Lycopersicum esculentum) fruits. Genomic analysis
suggests the presence of a single gene in these organisms, the
expression of which parallels phytoene desaturase and  -carotene desaturase gene expression during fruit ripening. Furthermore, this
PTOX gene is impaired in the tomato ghost
mutant, which accumulates phytoene in leaves and fruits. These data
show that PTOX also participates in carotenoid desaturation in
chromoplasts in addition to its role during early chloroplast development.
1
This work was supported by the European
Commission DGXII Biotechnology Programme (contract BIO4-96-2077).
*
Corresponding author; e-mail marcel.kuntz{at}ujf-grenoble.fr; fax
33-476-51-4336.
© 2000 American Society of Plant Physiologists
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