In plants, carotenoid accumulation and sequestration take place within chloroplasts and chromoplasts. In the chloroplast, practically all carotenoids are associated with chlorophyll-binding proteins, whereas chromoplasts have developed a unique mechanism to sequester carotenoids within specific lipoprotein structures. Recent research into the existence of a group of homologous genes that encode carotenoid-associated proteins that aid in the generation of carotenoid-lipoprotein structures in chromoplasts, offers a new framework for elucidating the carotenoid sequestration mechanism.
Bibliographical noteFunding Information:
We thank Prof. B. Camara for providing part of Fig. 1 and Prof. E.B. Dumbroff for helpful discussions. Our work on carotenoid-associated proteins is supported by a grant from the Israeli Ministry of Science and Fine Arts, the Ministry of Absorption (to M.O.) and the Association of Israeli Flower Growers.