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  1. IPB Halle
  2. Research
  3. Publications

    • Research Mission and Profile
    • Trenner 0
    • Molecular Signal Processing
      • Secretariat & All Staff
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        • Nutrient Sensing
        • Symbiosis Signaling
        • Jasmonate Signaling
    • Bioorganic Chemistry
      • Secretariat & All Staff
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        • Bioactives
        • Natural Products & Metabolomics
        • Biotechnology
        • Biofunctional Synthesis
        • Computational Chemistry
        • Data & Resources
    • Biochemistry of Plant Interactions
      • Secretariat & All Staff
      • Technical Resources
      • Publications
      • Research Groups
        • Calcium-dependent Protein Kinases
        • Cellular Signaling
        • Metabolite-based Defense Mechanisms
        • Nuclear Processes in Plant Defense
    • Cell and Metabolic Biology
      • Secretariat & All Staff
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Nowack, M.; Harashima, H.; Dissmeyer, N.; Zhao, X.; Bouyer, D.; Weimer, A.; De Winter, F.; Yang, F.; Schnittger, A.; Genetic Framework of Cyclin-Dependent Kinase Function in Arabidopsis Dev. Cell 22 1030-1040 (2012) DOI: 10.1016/j.devcel.2012.02.015
  • Abstract
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Cyclin-dependent kinases (CDKs) are at the heart of eukaryotic cell-cycle control. The yeast Cdc2/CDC28 PSTAIRE kinase and its orthologs such as the mammalian Cdk1 have been found to be indispensable for cell-cycle progression in all eukaryotes investigated so far. CDKA;1 is the only PSTAIRE kinase in the flowering plant Arabidopsis and can rescue Cdc2/CDC28 mutants. Here, we show that cdka;1 null mutants are viable but display specific cell-cycle and developmental defects, e.g., in S phase entry and stem cell maintenance. We unravel that the crucial function of CDKA;1 is the control of the plant Retinoblastoma homolog RBR1 and that codepletion of RBR1 and CDKA;1 rescued most defects of cdka;1 mutants. Our work further revealed a basic cell-cycle control system relying on two plant-specific B1-type CDKs, and the triple cdk mutants displayed an early germline arrest. Taken together, our data indicate divergent functional differentiation of Cdc2-type kinases during eukaryote evolution.

Publications

Zhao, X.; Harashima, H.; Dissmeyer, N.; Pusch, S.; Weimer, A. K.; Bramsiepe, J.; Bouyer, D.; Rademacher, S.; Nowack, M. K.; Novak, B.; Sprunck, S.; Schnittger, A.; A General G1/S-Phase Cell-Cycle Control Module in the Flowering Plant Arabidopsis thaliana PLOS Genet. 8 e1002847 (2012) DOI: 10.1371/journal.pgen.1002847
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  • BibText
  • RIS

The decision to replicate its DNA is of crucial importance for every cell and, in many organisms, is decisive for the progression through the entire cell cycle. A comparison of animals versus yeast has shown that, although most of the involved cell-cycle regulators are divergent in both clades, they fulfill a similar role and the overall network topology of G1/S regulation is highly conserved. Using germline development as a model system, we identified a regulatory cascade controlling entry into S phase in the flowering plant Arabidopsis thaliana, which, as a member of the Plantae supergroup, is phylogenetically only distantly related to Opisthokonts such as yeast and animals. This module comprises the Arabidopsis homologs of the animal transcription factor E2F, the plant homolog of the animal transcriptional repressor Retinoblastoma (Rb)-related 1 (RBR1), the plant-specific F-box protein F-BOX-LIKE 17 (FBL17), the plant specific cyclin-dependent kinase (CDK) inhibitors KRPs, as well as CDKA;1, the plant homolog of the yeast and animal Cdc2+/Cdk1 kinases. Our data show that the principle of a double negative wiring of Rb proteins is highly conserved, likely representing a universal mechanism in eukaryotic cell-cycle control. However, this negative feedback of Rb proteins is differently implemented in plants as it is brought about through a quadruple negative regulation centered around the F-box protein FBL17 that mediates the degradation of CDK inhibitors but is itself directly repressed by Rb. Biomathematical simulations and subsequent experimental confirmation of computational predictions revealed that this regulatory circuit can give rise to hysteresis highlighting the here identified dosage sensitivity of CDK inhibitors in this network.

Publications

Weimer, A. K.; Nowack, M. K.; Bouyer, D.; Zhao, X.; Harashima, H.; Naseer, S.; De Winter, F.; Dissmeyer, N.; Geldner, N.; Schnittger, A.; RETINOBLASTOMA RELATED1 Regulates Asymmetric Cell Divisions in Arabidopsis Plant Cell 24 4083-4095 (2012) DOI: 10.1105/tpc.112.104620
  • Abstract
  • BibText
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Formative, also called asymmetric, cell divisions produce daughter cells with different identities. Like other divisions, formative divisions rely first of all on the cell cycle machinery with centrally acting cyclin-dependent kinases (CDKs) and their cyclin partners to control progression through the cell cycle. However, it is still largely obscure how developmental cues are translated at the cellular level to promote asymmetric divisions. Here, we show that formative divisions in the shoot and root of the flowering plant Arabidopsisthaliana are controlled by a common mechanism that relies on the activity level of the Cdk1 homolog CDKA;1, with medium levels being sufficient for symmetric divisions but high levels being required for formative divisions. We reveal that the function of CDKA;1 in asymmetric cell divisions operates through a transcriptional regulation system that is mediated by the Arabidopsis Retinoblastoma homolog RBR1. RBR1 regulates not only cell cycle genes, but also, independent of the cell cycle transcription factor E2F, genes required for formative divisions and cell fate acquisition, thus directly linking cell proliferation with differentiation. This mechanism allows the implementation of spatial information, in the form of high kinase activity, with intracellular gating of developmental decisions.

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