CKS1At overexpression in Arabidopsis thaliana inhibits growth by reducing meristem size and inhibiting cell-cycle progression.
The SUC1/CKS1 proteins associate with cyclin-dependent kinases (CDKs) and play an essential role in the regulation of the cell cycle. Recently, an Arabidopsis thaliana SUC1/CKS1 homologous gene, designated CKS1At, has been cloned. Here, overexpression of CKS1At in Arabidopsis is shown to reduce leaf size and root growth rates. Reduced root growth resulted primarily from an increase of the cell-cycle duration and a shortening of the meristem. Endoreduplication was unaffected. The increased cell-cycle duration was associated with an equal extension of both the G1 and G2 phases. This inhibition was due to the binding of CDK subunits with CDKs. The reduced growth rates in response to altered cell-cycle gene expression demonstrates a direct dependence of plant growth rates on cell-cycle regulation.
De Veylder
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Vakgroep Moleculaire Genetica & Departement Plantengenetica, Vlaams Interuniversitair Instituut voor Biotechnologie (VIB), Universiteit Gent, K.L. Ledeganckstraat 35, B-9000 Gent, Belgium.
Beemster
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Beeckman
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Inzé
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D048868:Adaptor Proteins, Signal Transducing; D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000502:physiology; D002455:Cell Division / Q000235:genetics / Q000502:physiology; D018844:Cyclin-Dependent Kinases / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000378:metabolism; D017931:DNA Primers; D005434:Flow Cytometry; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D018519:Meristem / Q000254:growth & development; D018517:Plant Roots / Q000166:cytology / Q000254:growth & development; D018520:Plant Shoots / Q000254:growth & development; D030821:Plants, Genetically Modified; D012440:Saccharomyces / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins
D048868:Adaptor Proteins, Signal Transducing; C081185:CKS1 protein, S cerevisiae; D018797:Cell Cycle Proteins; D017931:DNA Primers; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D029702:Schizosaccharomyces pombe Proteins; C051655:Suc1 protein, S pombe; D018844:Cyclin-Dependent Kinases