Journal
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
Volume 84, Issue 3, Pages 342-362Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/B06-014
Keywords
ribosomal proteins; coordinated regulation; ribosome synthesis; target of rapamycin; S6 phosphorylation
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The ribosome is an intricate ribonucleoprotein complex with a multitude of protein constituents present in equimolar amounts. Coordination of the synthesis of these ribosomal proteins (r-proteins) presents a major challenge to the cell. Although most r-proteins are highly conserved, the mechanisms by which r-protein gene expression is regulated often differ widely among species. While the primary regulatory mechanisms coordinating r-protein synthesis in bacteria, yeast, and animals have been identified, the mechanisms governing the coordination of plant r-protein expression remain largely unexplored. In addition, plants are unique among eukaryotes in carrying multiple (often more than two) functional genes encoding each r-protein, which substantially complicates coordinate expression. A survey of the current knowledge regarding coordinated systems of r-protein gene expression in different model organisms suggests that vertebrate r-protein gene regulation provides a valuable comparison for plants.
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