Olave, Marcella , Alizadeh, Darya , Cohen, Amybeth .
Expression of Red Light-induced RNA-binding Proteins and Potential Association of a Phytochrome-like Protein in Chlamydomonas reinhardtii.
Phytochrome has been identified in plants, fungi, and several bacteria. These red/far red reversible photoreceptors direct numerous physiological changes within an organism through a series of signal transduction pathways, which result in changes in gene expression. Despite the absence of phytochrome in the unicellular green alga Chlamydomonas reinhardtii, we have identified several red light-inducible genes, including the nuclear-encoded psbA RNA-binding protein genes (rb38 and rb60), and the oxygen evolving enhancer gene, oee1. Initial studies involving the exposure of cells to red light, followed by far-red light, resulted in a pattern of mRNA accumulation for some genes that suggested photoreversibility. Treatment of cells with the Calmodulin antagonist, W7, caused a decrease in rb60, rb38, and oee1 mRNA accumulation, which strongly suggests the involvement of Calmodulin in their regulatory pathways. A tblastn search of the Chlamydomonas reinhardtii genome identified a sequence that is homologous to the phytochrome-like protein Cph2 from the cyanobacterium Synechocystis sp. strain PCC6803. These findings have directed our investigation towards identifying whether a phytochrome-like protein exists in Chlamydomonas reinhardtii
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1 - California State University, Fullerton, Biological Science, 800 North State College Blvd., Fullerton, Ca, 92831, United States
2 - California State University, Fullerton, Biological Science
nuclear and chloroplast DNA analysis.
Presentation Type: Plant Biology Abstract
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM