Nowack, Moritz K., Harashima, Hirofumi, Dissmeyer, Nico, Zhao, Xin'Ai, Bouyer, Daniel, Weimer, Annika K., De Winter, Freya, Yang, Fang, Schnittger, Arp (May 2012) Genetic Framework of Cyclin-Dependent Kinase Function in Arabidopsis. Developmental Cell, 22 (5). pp. 1030-1040. ISSN 1534-5807
Abstract
Summary 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.
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