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Caractérisation d'une oxydase terminale plastidiale impliquée dans la biosynthèse des caroténoïdes et dans la réponse au stress.

Abstract : The Arabidopsis mutant immutans displays a variegated phenotype and is accumulating phytoen, a carotenoid precursor.
The IMMUTANS gene encodes a plastid homolog of the mitochondrial alternative oxidase, that can be detected in stroma lamellae of the thylakoid and in achlorophyllous chromoplast membranes. Upon expression in E. coli, this protein confers a detectable KCN-resistant electron transport to isolated membranes, this transport being sensitive to nPG. Thus, this protein appears to be a Plastid Terminal OXidase (PTOX), and its activity requires PQ and iron.
PTOX also seems to be the terminal oxidase of the chlororespiration. When expressed in tobacco, PTOX accelerates the non-photochemical reoxidation of plastoquinols, and drives significant electron flow to O2, thus avoiding over-reduction of plastoquinones. PTOX strong accumulation in the high mountain plant Ranunculus glacialis is suggesting a specific involvment of PTOX in a resistance to photoinhibition mechanism.
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https://tel.archives-ouvertes.fr/tel-00012072
Contributor : Eve-Marie Josse <>
Submitted on : Friday, March 31, 2006 - 2:23:23 PM
Last modification on : Friday, November 6, 2020 - 3:45:26 AM
Long-term archiving on: : Saturday, April 3, 2010 - 11:05:07 PM

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  • HAL Id : tel-00012072, version 1

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Eve-Marie Josse. Caractérisation d'une oxydase terminale plastidiale impliquée dans la biosynthèse des caroténoïdes et dans la réponse au stress.. Biologie végétale. Université Joseph-Fourier - Grenoble I, 2003. Français. ⟨tel-00012072⟩

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