The reduced kinome of Ostreococcus tauri: core eukaryotic signalling components in a tractable model species

BMC Genomics

Andrew J Millar²  Thierry Le Bihan²  T Ian Simpson¹  Martin E Barrios-Llerena²  Gerben van Ooijen²  Zeenat B Noordally²  Sarah F Martin²  Matthew M Hindle¹ 

[1] Institute for Adaptive and Neural Computation, School of Informatics, University of Edinburgh, Edinburgh EH8 9AB, UK;Institute of Structural and Molecular Biology, University of Edinburgh, Edinburgh EH9 3JR, UK

关键词: Circadian clock;    MAPK cascade;    TOR signalling;    Phosphorylation;    Model kinome;    Ostreococcus tauri;    Protein kinase phylogeny;    Conserved eukaryote signalling;   

Others  :  1216344
DOI  :  10.1186/1471-2164-15-640

 received in 2014-01-24, accepted in 2014-07-08,  发布年份 2014

【 摘 要 】

Background

The current knowledge of eukaryote signalling originates from phenotypically diverse organisms. There is a pressing need to identify conserved signalling components among eukaryotes, which will lead to the transfer of knowledge across kingdoms. Two useful properties of a eukaryote model for signalling are (1) reduced signalling complexity, and (2) conservation of signalling components. The alga Ostreococcus tauri is described as the smallest free-living eukaryote. With less than 8,000 genes, it represents a highly constrained genomic palette.

Results

Our survey revealed 133 protein kinases and 34 protein phosphatases (1.7% and 0.4% of the proteome). We conducted phosphoproteomic experiments and constructed domain structures and phylogenies for the catalytic protein-kinases. For each of the major kinases families we review the completeness and divergence of O. tauri representatives in comparison to the well-studied kinomes of the laboratory models Arabidopsis thaliana and Saccharomyces cerevisiae, and of Homo sapiens. Many kinase clades in O. tauri were reduced to a single member, in preference to the loss of family diversity, whereas TKL and ABC1 clades were expanded. We also identified kinases that have been lost in A. thaliana but retained in O. tauri. For three, contrasting eukaryotic pathways – TOR, MAPK, and the circadian clock – we established the subset of conserved components and demonstrate conserved sites of substrate phosphorylation and kinase motifs.

Conclusions

We conclude that O. tauri satisfies our two central requirements. Several of its kinases are more closely related to H. sapiens orthologs than S. cerevisiae is to H. sapiens. The greatly reduced kinome of O. tauri is therefore a suitable model for signalling in free-living eukaryotes.

【 授权许可】

   
2014 Hindle et al.; licensee BioMed Central Ltd.

【 图 表 】

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