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The cyclin-dependent kinase inhibitor KRP2 controls the onset of the endoreduplication cycle during Arabidopsis leaf development through inhibition of mitotic CDKA;1 kinase complexes

(2005) PLANT CELL. 17(6). p.1723-1736
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Abstract
Exit from the mitotic cell cycle and initiation of cell differentiation frequently coincides with the onset of endoreduplication, a modified cell cycle during which DNA continues to be duplicated in the absence of mitosis. Although the mitotic cell cycle and the endoreduplication cycle share much of the same machinery, the regulatory mechanisms controlling the transition between both cycles remain poorly understood. We show that the A-type cyclin-dependent kinase CDKA; 1 and its specific inhibitor, the Kip-related protein, KRP2 regulate the mitosis-to-endocycle transition during Arabidopsis thaliana leaf development. Constitutive overexpression of KRP2 slightly above its endogenous level only inhibited the mitotic cell cycle specific CDKA; 1 kinase complexes, whereas the endoreduplication cycle-specific CDKA; 1 complexes were unaffected, resulting in an increase in the DNA ploidy level. An identical effect on the endoreduplication cycle could be observed by overexpressing KRP2 exclusively in mitotically dividing cells. In agreement with a role for KRP2 as activator of the mitosis-to-endocycle transition, KRP2 protein levels were more abundant in endoreduplicating than in mitotically dividing tissues. We illustrate that KRP2 protein abundance is regulated posttranscriptionally through CDK phosphorylation and proteasomal degradation. KRP2 phosphorylation by the mitotic cell cycle-specific CDKB1;1 kinase suggests a mechanism in which CDKB1; 1 controls the level of CDKA; 1 activity through regulating KRP2 protein abundance. In accordance with this model, KRP2 protein levels increased in plants with reduced CDKB1; 1 activity. Moreover, the proposed model allowed a dynamical simulation of the in vivo observations, validating the sufficiency of the regulatory interactions between CDKA; 1, KRP2, and CDKB1; 1 in fine-tuning the mitosis-to-endocycle transition.
Keywords
MAIZE ENDOSPERM, IN-VITRO, PLANT DEVELOPMENT, FUNCTIONAL-ANALYSIS, MEDIATED TRANSFORMATION, REDUCES ENDOREDUPLICATION, DNA-REPLICATION, S-PHASE, ANAPHASE-PROMOTING COMPLEX, CELL-SIZE CONTROL

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Chicago
Verkest, Aurine, Carmem-Lara de Oliveira Manes, Steven Vercruysse, Sara Maes, Els Van Der Schueren, Tom Beeckman, Pascal Genschik, Martin Kuiper, Dirk Inzé, and Lieven De Veylder. 2005. “The Cyclin-dependent Kinase Inhibitor KRP2 Controls the Onset of the Endoreduplication Cycle During Arabidopsis Leaf Development Through Inhibition of Mitotic CDKA;1 Kinase Complexes.” Plant Cell 17 (6): 1723–1736.
APA
Verkest, A., de Oliveira Manes, C.-L., Vercruysse, S., Maes, S., Van Der Schueren, E., Beeckman, T., Genschik, P., et al. (2005). The cyclin-dependent kinase inhibitor KRP2 controls the onset of the endoreduplication cycle during Arabidopsis leaf development through inhibition of mitotic CDKA;1 kinase complexes. PLANT CELL, 17(6), 1723–1736.
Vancouver
1.
Verkest A, de Oliveira Manes C-L, Vercruysse S, Maes S, Van Der Schueren E, Beeckman T, et al. The cyclin-dependent kinase inhibitor KRP2 controls the onset of the endoreduplication cycle during Arabidopsis leaf development through inhibition of mitotic CDKA;1 kinase complexes. PLANT CELL. 2005;17(6):1723–36.
MLA
Verkest, Aurine, Carmem-Lara de Oliveira Manes, Steven Vercruysse, et al. “The Cyclin-dependent Kinase Inhibitor KRP2 Controls the Onset of the Endoreduplication Cycle During Arabidopsis Leaf Development Through Inhibition of Mitotic CDKA;1 Kinase Complexes.” PLANT CELL 17.6 (2005): 1723–1736. Print.
@article{330998,
  abstract     = {Exit from the mitotic cell cycle and initiation of cell differentiation frequently coincides with the onset of endoreduplication, a modified cell cycle during which DNA continues to be duplicated in the absence of mitosis. Although the mitotic cell cycle and the endoreduplication cycle share much of the same machinery, the regulatory mechanisms controlling the transition between both cycles remain poorly understood. We show that the A-type cyclin-dependent kinase CDKA; 1 and its specific inhibitor, the Kip-related protein, KRP2 regulate the mitosis-to-endocycle transition during Arabidopsis thaliana leaf development. Constitutive overexpression of KRP2 slightly above its endogenous level only inhibited the mitotic cell cycle specific CDKA; 1 kinase complexes, whereas the endoreduplication cycle-specific CDKA; 1 complexes were unaffected, resulting in an increase in the DNA ploidy level. An identical effect on the endoreduplication cycle could be observed by overexpressing KRP2 exclusively in mitotically dividing cells. In agreement with a role for KRP2 as activator of the mitosis-to-endocycle transition, KRP2 protein levels were more abundant in endoreduplicating than in mitotically dividing tissues. We illustrate that KRP2 protein abundance is regulated posttranscriptionally through CDK phosphorylation and proteasomal degradation. KRP2 phosphorylation by the mitotic cell cycle-specific CDKB1;1 kinase suggests a mechanism in which CDKB1; 1 controls the level of CDKA; 1 activity through regulating KRP2 protein abundance. In accordance with this model, KRP2 protein levels increased in plants with reduced CDKB1; 1 activity. Moreover, the proposed model allowed a dynamical simulation of the in vivo observations, validating the sufficiency of the regulatory interactions between CDKA; 1, KRP2, and CDKB1; 1 in fine-tuning the mitosis-to-endocycle transition.},
  author       = {Verkest, Aurine and de Oliveira Manes, Carmem-Lara and Vercruysse, Steven and Maes, Sara and Van Der Schueren, Els and Beeckman, Tom and Genschik, Pascal and Kuiper, Martin and Inz{\'e}, Dirk and De Veylder, Lieven},
  issn         = {1040-4651},
  journal      = {PLANT CELL},
  language     = {eng},
  number       = {6},
  pages        = {1723--1736},
  title        = {The cyclin-dependent kinase inhibitor KRP2 controls the onset of the endoreduplication cycle during Arabidopsis leaf development through inhibition of mitotic CDKA;1 kinase complexes},
  url          = {http://dx.doi.org/10.1105/tpc.105.032383},
  volume       = {17},
  year         = {2005},
}

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