Isolation and Characterization of a Protein Associated with Carotene Globules in the Alga Dunaliella bardawil.

Abstract:

:The halotolerant alga Dunaliella bardawil accumulates very large amounts of [beta]-carotene when exposed to high light intensity. The accumulated [beta]-carotene is concentrated in small, oily globules within the chloroplast and has been suggested to protect the alga against photodamage by high irradiation (A. Ben-Amotz, A. Katz, M. Avron [1982] J Phycol 18:529-537;A. Ben-Amotz, M. Avron [1983] Plant Physiol 72: 593-597; A. Ben-Amotz, A. Shaish, M. Avron [1989] Plant Physiol 91: 1040-1043). A 38-kD protein was identified and purified from [beta]-carotene globules and was designated carotene globule protein (Cgp). Induction of Cgp occurs in parallel with [beta]-carotene accumulation in D. bardawil grown under different inductive conditions. Cgp is overproduced in a constitutive mutant strain that overproduces [beta]-carotene and is not detected in Dunaliella salina, a species that does not accumulate [beta]-carotene. Cgp production was not suppressed by norflurazon, an inhibitor of [beta]-carotene synthesis that leads to accumulation of the carotenoid precursor phytoene. Immunogold-labeling analysis by electron microscopy demonstrates that the protein is localized at the periphery of the globules. Proteolytic cleavage by trypsin enhances the coalescence and destruction of the globules, in parallel with Cgp disappearance. It is suggested that the function of Cgp is to stabilize the structure of the globules within the chloroplast.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Katz A,Jimenez C,Pick U

doi

10.1104/pp.108.4.1657

subject

Has Abstract

pub_date

1995-08-01 00:00:00

pages

1657-1664

issue

4

eissn

0032-0889

issn

1532-2548

pii

108/4/1657

journal_volume

108

pub_type

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