Research Article

Cellular and Molecular Life Sciences CMLS

, Volume 61, Issue 12, pp 1485-1497

First online:

Molecular characterization of Arabidopsis PHO80-like proteins, a novel class of CDKA;1-interacting cyclins

  • J. A. Torres AcostaAffiliated withCenter of Applied Genetics, University of Agricultural Sciences
  • , J. de Almeida EnglerAffiliated withInstitut National de la Recherche Agronomique, Unité Interactions Plantes-Microorganismes et Santé Végétale
  • , J. RaesAffiliated withDepartment of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University
  • , Z. MagyarAffiliated withSchool of Biological Sciences, Royal Holloway, University of London
  • , R. De GroodtAffiliated withDepartment of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University
  • , D. InzéAffiliated withDepartment of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University Email author 
  • , L. De VeylderAffiliated withDepartment of Plant Systems Biology, Flanders Interuniversity Institute for Biotechnology (VIB), Ghent University

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Abstract

Cyclins are regulatory proteins that interact with cyclin-dependent kinases (CDKs) to control progression through the cell cycle. In Arabidopsis thaliana, 34 cyclin genes have been described, grouped into five different types (A, B, D, H, and T). A novel class of seven cyclins was isolated and characterized in Arabidopsis, designated P-type cyclins (CYCPs). They all share a conserved central region of 100 amino acids (“cyclin box”) displaying homology to the corresponding region of the PHO80 cyclin from Saccharomyces cerevisiae and the related G1 cyclins from Trypanosoma cruzi and T. brucei. The CYCP4;2 gene was able to partially re-establish the phosphate-dependent expression of the PHO5 gene in a pho80 mutant strain of yeast. The CYCPs interact preferentially with CDKA;1 in vivo and in vitro as shown by yeast two-hybrid analysis and co-immunoprecipitation experiments. P-type cyclins were mostly expressed in proliferating cells, albeit also in differentiating and mature tissues. The possible role of CYCPs in linking cell division, cell differentiation, and the nutritional status of the cell is discussed.

Arabidopsis thaliana cyclin-dependent kinase CDKA;1 cyclin PHO80-like protein yeast two-hybrid