Post-translational regulation of FLC is mediated by an E3 ubiquitin ligase activity of SINAT5 in Arabidopsis

Bong Soo Park, Wan Gyu Sang, Song Yion Yeu, Yang Do Choi, Nam Chon Paek, Min Chul Kim, Jong Tae Song, Hak Soo Seo

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Suppression of Flowering Locus C (FLC) is critical for the transition from the vegetative to reproductive phase in Arabidopsis. FLC represses the expression of several genes involved in floral induction and its transcription is positively or negatively regulated by FRIGIDA or by vernalization, respectively. However, the regulatory mechanisms for the level and stability of FLC protein throughout development are unknown. Here, we show that SINAT5 colocalizes with FLC in the nuclear bodies and that its zinc finger motif interacts directly with the MADS-box domain of FLC. In addition, it is shown that SINAT5 has an E3 ubiquitin ligase activity towards FLC as a substrate, suggesting that SINAT5 participates in the regulation of flowering time through the ubiquitin-mediated proteolysis of FLC.

Original languageEnglish (US)
Pages (from-to)269-275
Number of pages7
JournalPlant Science
Issue number2
StatePublished - Aug 2007
Externally publishedYes


  • E3 ubiquitin ligase
  • Flowering
  • Flowering Locus C (FLC)
  • Nuclear body
  • SINAT5
  • Ubiquitination

ASJC Scopus subject areas

  • Genetics
  • Agronomy and Crop Science
  • Plant Science


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