The Plant Cell, Vol. 13, 1653-1668,
July 2001, Copyright © 2001,
American Society of Plant Biologists
Functional Analysis of Cyclin-Dependent Kinase Inhibitors of Arabidopsis
Lieven De Veyldera,
Tom Beeckmana,
Gerrit T.S. Beemstera,
Luc Krolsb,
Franky Terrasb,
Isabelle Landrieuc,
Els Van Der Schuerena,
Sara Maesa,
Mirande Naudtsa and
Dirk Inzéa,1
a Vakgroep Moleculaire Genetica, Departement Plantengenetica, Vlaams Interuniversitair Instituut voor Biotechnologie, Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium
b CropDesign N.V., B-9052 Zwijnaarde, Belgium
c Institut de Biologie de Lille/Institut Pasteur de Lille, Centre National de la Recherche Scientifique Unité Mixte de Recherche 8525, F-59019 Lille Cedex, France
1 To whom correspondence should be addressed. E-mail diinz{at}gengenp.rug.ac.be; fax 32-9-2645349
Cyclin-dependent kinase inhibitors, such as the mammalian p27Kip1 protein, regulate correct cell cycle progression and the integration of developmental signals with the core cell cycle machinery. These inhibitors have been described in plants, but their function remains unresolved. We have isolated seven genes from Arabidopsis that encode proteins with distant sequence homology with p27Kip1, designated Kip-related proteins (KRPs). The KRPs were characterized by their domain organization and transcript profiles. With the exception of KRP5, all presented the same cyclin-dependent kinase binding specificity. When overproduced, KRP2 dramatically inhibited cell cycle progression in leaf primordia cells without affecting the temporal pattern of cell division and differentiation. Mature transgenic leaves were serrated and consisted of enlarged cells. Although the ploidy levels in young leaves were unaffected, endoreduplication was suppressed in older leaves. We conclude that KRP2 exerts a plant growth inhibitory activity by reducing cell proliferation in leaves, but, in contrast to its mammalian counterparts, it may not control the timing of cell cycle exit and differentiation.
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G. West, D. Inze, and G. T.S. Beemster
Cell Cycle Modulation in the Response of the Primary Root of Arabidopsis to Salt Stress
Plant Physiology,
June 1, 2004;
135(2):
1050 - 1058.
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