We isolated and sequenced a cDNA clone encoding a minor chlorophyll a/b-binding protein, CP26, which is associated with the light-harvesting complex II of Chlamydomonas reinhardtii. Protein sequences of internal peptide fragments from purified CP26 were determined and used to identify a cDNA clone. The 1.1 kb lhcb5 gene codes for a polypeptide of 289 amino acids with a predicted molecular weight of 30 713. The lhcb5 gene product could reconstitute with chlorophylls and xanthophylls to form a green band on a gel. Although the expression of many lhcb genes are strictly regulated by light, the lhcb5 gene was only loosely regulated. We propose that a plant acclimatizes itself to the light environment by quantitatively and qualitatively modulating the light-harvesting complex. Characterization of the primary structure and the implications of its unique expression are discussed.
Plant Molecular Biology – Springer Journals
Published: Oct 3, 2004
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