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The Plant Cell, Vol. 13, 1891-1905, August 2001, Copyright © 2001,
American Society of Plant Biologists

G2/M-Phase–Specific Transcription during the Plant Cell Cycle Is Mediated by c-Myb–Like Transcription Factors

Masaki Ito3,a, Satoshi Araki1,b, Sachihiro Matsunagac, Takashi Itoha, Ryuichi Nishihamab, Yasunori Machidab, John H. Doonand and Akira Watanabea,2

a Department of Biological Sciences, Graduate School of Science, University of Tokyo, Hongo, Tokyo 113-0033, Japan
b Division of Biological Science, Graduate School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
c Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Hongo, Tokyo 113-0033, Japan
d Department of Cell Biology, John Innes Centre, Colney, Norwich NR4 7UH, United Kingdom

3 To whom correspondence should be addressed. E-mail masakito{at}biol.s.u-tokyo.ac.jp; fax 81-3-3814-1728

Plant B-type cyclin genes are expressed specifically in late G2- and M-phases during the cell cycle. Their promoters contain a common cis-acting element, called the MSA (M-specific activator) element, that is necessary and sufficient for periodic promoter activation. This motif also is present in the tobacco kinesin-like protein gene NACK1, which is expressed with timing similar to that of B-type cyclin genes. In this study, we show that G2/M-phase–specific activation of the NACK1 promoter also is regulated by the MSA element, suggesting that a defined set of G2/M-phase–specific genes are coregulated by an MSA-mediated mechanism. In a search for MSA binding factors by yeast one-hybrid screening, we identified three different Myb-like proteins that interact specifically with the MSA sequence. Unlike the majority of plant Myb-like proteins, these Myb proteins, NtmybA1, NtmybA2, and NtmybB, have three imperfect repeats in the DNA binding domain, as in animal c-Myb proteins. During the cell cycle, the level of NtmybB mRNA did not change significantly, whereas the levels of NtmybA1 and A2 mRNAs fluctuated and peaked at M-phase, when B-type cyclin genes were maximally induced. In transient expression assays, NtmybA1 and A2 activated the MSA-containing promoters, whereas NtmybB repressed them. Furthermore, expression of NtmybB repressed the transcriptional activation mediated by NtmybA2. Our data show that a group of plant Myb proteins that are structurally similar to animal c-Myb proteins have unexpected roles in G2/M-phase by modulating the expression of B-type cyclin genes and may regulate a suite of coexpressed genes.




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