Abstract：
:Ostreococcus tauri is a unicellular green alga and amongst the smallest and simplest free-living eukaryotes. The O. tauri genome sequence was determined in 2006. Molecular, physiological and taxonomic data that has been generated since then highlight its potential as a simple model species for algae and plants. However, its proteome remains largely unexplored. This paper describes the global proteomic study of O. tauri, using mass spectrometry-based approaches: phosphopeptide enrichment, cellular fractionation, label-free quantification and (15)N metabolic labeling. The O. tauri proteome was analyzed under the following conditions: sampling at different times during the circadian cycle, after 24h of illumination, after 24h of darkness and under various nitrogen source supply levels. Cell cycle related proteins such as dynamin and kinesin were significantly up-regulated during the daylight-to-darkness transition. This is reflected by their higher intensity at ZT13 and this transition phase coincides with the end of mitosis. Proteins involved in several metabolic mechanisms were found to be up-regulated under low nitrogen conditions, including carbon storage pathways, glycolysis, phosphate transport, and the synthesis of inorganic polyphosphates. Ostreococcus tauri responds to low nitrogen conditions by reducing its nitrogen assimilation machinery which suggests an atypical adaptation mechanism for coping with a nutrient-limited environment.
journal_name
J Proteomicsjournal_title
Journal of proteomicsauthors
Le Bihan T,Martin SF,Chirnside ES,van Ooijen G,Barrios-Llerena ME,O'Neill JS,Shliaha PV,Kerr LE,Millar AJdoi
10.1016/j.jprot.2011.05.028subject
Has Abstractpub_date
2011-09-06 00:00:00pages
2060-70issue
10eissn
1874-3919issn
1876-7737pii
S1874-3919(11)00242-9journal_volume
74pub_type
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