Transcriptional repression by MYB3R proteins regulates plant organ growth

Kosuke Kobayashi, Toshiya Suzuki, Eriko Iwata, Poyu Chen, Misato Ohtani, Takashi Ishida, Hanako Hosoya, Sabine Müller, Tünde Leviczky, Aladár Pettkó-Szandtner, Zsuzsanna Darula, Akitoshi Iwamoto, Mika Nomoto, Yasuomi Tada, Tetsuya Higashiyama, Taku Demura, John Doonan, Marie-Theres Hauser, Keiko Sugimoto, Masaaki UmedaZoltán Magyar, László Bögre, Masaki Ito, Norihito Nakmichi, Takamasa Suzuki

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In multicellular organisms, temporal and spatial regulation of cell proliferation is central for generating organs with defined sizes and morphologies. For establishing and maintaining the post-mitotic quiescent state during cell differentiation, it is important to repress genes with mitotic functions. We found that three of the Arabidopsis MYB3R transcription factors synergistically maintain G2/M-specific genes repressed in post-mitotic cells and restrict the time window of mitotic gene expression in proliferating cells. The combined mutants of the three repressor-type MYB3R genes displayed long roots, enlarged leaves, embryos, and seeds. Genome-wide chromatin immunoprecipitation revealed that MYB3R3 binds to the promoters of G2/M-specific genes and to E2F target genes. MYB3R3 associates with the repressor-type E2F, E2FC, and the RETINOBLASTOMA RELATED proteins. In contrast, the activator MYB3R4 was in complex with E2FB in proliferating cells. With mass spectrometry and pairwise interaction assays, we identified some of the other conserved components of the multiprotein complexes, known as DREAM/dREAM in human and flies. In plants, these repressor complexes are important for periodic expression during cell cycle and to establish a post-mitotic quiescent state determining organ size.
Original languageEnglish
Pages (from-to)1992-2007
Number of pages16
JournalEMBO Journal
Issue number15
Early online date11 Jun 2015
Publication statusPublished - 04 Aug 2015


  • cell cycle regulation
  • cell differentiation
  • DREAM complex
  • G2/M phase
  • MYB transcription factors


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