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J. Biol. Chem., Vol. 266, Issue 21, 13698-13705, Jul, 1991
A Lers, H Levy and A Zamir
Dunaliella bardawil, a unicellular green alga that can be induced to
accumulate massive amounts of beta-carotene, is particularly suitable for
studies of carotenogenesis regulation and its links to developmental and
adaptive processes in the chloroplast. A cDNA clone corresponding to a
transcript accumulating coordinately with carotenogenesis induction was
isolated by differential hybridization of a cDNA library made from
intensely illuminated cells. This transcript was also abundant in algal
mutants able to accumulate beta-carotene under relatively low light
intensity. DNA sequence analysis indicates that cbr (for carotene
biosynthesis-related) is closely related to early light-induced genes
(elip) of higher plants. Similarity also exists between repeated
oligopeptide motifs in Cbr and Cab proteins of photosystems I and II. Three
upstream direct repeats in cbr include an octamer and hexamer related to
mammalian sterol regulatory elements. The relationship between cbr
transcript and beta-carotene accumulation, the structural similarity
between Cbr and Cab proteins, and the presence of potential SRE-1 elements
lead us to propose that Cbr represents novel carotenoid binding proteins,
whose synthesis might be coordinated with carotenogenic enzymes via an
evolutionary conserved regulatory mechanism.
Co-regulation of a gene homologous to early light-induced genes in higher plants and beta-carotene biosynthesis in the alga Dunaliella bardawil
Biochemistry Department, Weizmann Institute of Science, Rehovot, Israel.
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