Abstract
A cDNA was cloned encoding ornithine decarboxylase (ODC) of the unicellular green alga Chlamydomonas reinhardtii. The polypeptide consists of 396 amino acid residues with 35-37% sequence identity to other eukaryotic ODCs. As indicated by the phylogenetic tree calculated by neighbour joining analysis, the Chlamydomonas ODC has the same evolutionary distances to the ODCs of higher plants and mammalians. The Chlamydomonas ODC gene contains three introns of 222, 133, and 129bp, respectively. As revealed by Northern-blot analyses, expression of the Chlamydomonas ODC gene is neither altered throughout the vegetative cell cycle nor modulated by exogenous polyamines.
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