Cyclins are key regulators of a family of protein kinases called cyclin-dependent kinases (Cdks). Specific cyclins interact with specific Cdks to regulate the different transition points in the cell cycle. Six mitotic-like cyclins have previously been reported in Arabidopsis thaliana. Using polymerase chain reaction amplified cyclin-box sequences as probes, two new cyclin cDNAs are isolated from Arabidopsis. The deduced amino acid sequences of the isolated cDNAs (Arath;CycB1;3 and Arath;CycB1;4) show the highest sequence similarity with mitotic cyclins. Arath;CycB1;3 is most homologous to the plant CycB1group cyclins and contains a conserved motif that is typical of this group. Arath;CycB1;4, while homologous to Arath;CycB1;2, has some features that make it different from other known mitotic-like cyclins. These data suggest the presence of several distinct cyclins of CycB1 group in Arabidopsis. Analysis of expression of three members of CycB1 group (Arath;CycB1;2, Arath;CycB1;3 and Arath;CycB1;4) in different tissues by reverse transcription-polymerase chain reaction using primers corresponding to unique regions of their cDNAs shows that they are differentially expressed in different tissues.
Plant Molecular Biology – Springer Journals
Published: Oct 6, 2004
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