Terpenoid Metabolism in Plastids : Localization of alpha-Tocopherol Synthesis in Capsicum Chromoplasts.
The synthesis of alpha-tocopherol from 2,3-dimethylphytylquinol and S-adenosyl-l-methionine was achieved using Capsicum annuum fruit chromoplasts. The enzymes involved in the cyclization (2,3-dimethyl-phytylquinol cyclase) and methylation (S-adenosyl methionine:gamma-tocopherol methyl-transferase) are both localized in the chromoplast membrane fraction (envelopes and/or a-chlorophyll lamellae), in contrast to the stroma fraction.
Camara
B
B
Laboratoire de Régulations Métaboliques et Différenciation des Plastes, Tour 53, 2ème Etage, Université Pierre et Marie Curie (Paris 6) 4, Place Jussieu, 75230 Paris Cédex 05.
Bardat
F
F
Seye
A
A
D'Harlingue
A
A
Monéger
R
R