Abstract
We previously reported that cdk2 phosphorylates two serine residues near the DNA-binding domain of the YA subunit of NF-Y transcription factor and this phosphorylation is essential for DNA binding of NF-Y. In this study, we examined the effects of a phosphorylation-deficient mutant form of YA, YA-aa, in which the two serine residues are replaced with alanine, on the cell cycle and expression of the NF-Y target genes. Transient transfection assays show that YA-aa inhibits transcription from the NF-Y target promoters, such as cdc2, cyclin A, and cdc25C. Moreover, this inhibitory function of YA-aa can be suppressed by the expression of wild-type YA, implying that YA-aa inhibits transcription of those NF-Y target genes by inactivating wild-type YA. Since NF-Y target genes include the cell cycle-regulatory genes that ensure orderly progression of the cell cycle, we examined the effects of YA-aa in cell cycle progression. We constructed a recombinant adenovirus encoding YA-aa and found that YA-aa expression leads to repression of cell cycle-regulatory genes, such as cyclin A, RNR R2, DNA polymerase α, cdc2, cyclin B, and cdc25C. Consistently, YA-aa expression results in the inactivation of both cdc2 and cdk2. Furthermore, cell cycle analysis reveals that YA-aa induces cell cycle arrest at both G1 and G2/M. These results suggest that cdk2-dependent phosphorylation of NF-Y is essential for the expression of the cell cycle-regulatory genes and therefore for cell cycle progression at both G1/S and G2/M.
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Acknowledgements
We thank Dr K Homma for critical reading of the manuscript. This work is supported, in part, by the National Research Laboratory Program of the Korean Ministry of Science and Technology (DYS and YJB), the Molecular Aging Research Center (DYS), and research fund of Dankook University 2002.
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Chae, HD., Yun, J., Bang, YJ. et al. Cdk2-dependent phosphorylation of the NF-Y transcription factor is essential for the expression of the cell cycle-regulatory genes and cell cycle G1/S and G2/M transitions. Oncogene 23, 4084–4088 (2004). https://doi.org/10.1038/sj.onc.1207482
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DOI: https://doi.org/10.1038/sj.onc.1207482
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