Degradation of phytochrome interacting factor 3 in phytochrome-mediated light signaling

Eunae Park, Jonghyun Kim, Yeon Lee, Jieun Shin, Eunkyoo Oh, Won Il Chung, Ryul Liu Jang, Giltsu Choi

Research output: Contribution to journalArticlepeer-review

169 Citations (Scopus)


Plant photoreceptors regulate various developmental processes. Among the photoreceptors, phytochromes, red and far-red light receptors, regulate light responses through many signaling components, including phytochrome-interacting proteins. The functional relationships among phytochromes and their interacting proteins, however, have not been clearly established. Here, we sought to identify a functional relationship between phytochromes and phytochrome interacting factor 3 (PIF3). We demonstrate that PIF3 is polyubiquitinated rapidly and subsequently degraded in PHYA and PHYB-mediated light signaling. We also show that the degradation of PIF3 is mediated by the 26S proteasome. Our data indicate that light-stimulated phytochromes cause the degradation of their interacting protein, PIF3, by the 26S proteasome.

Original languageEnglish
Pages (from-to)968-975
Number of pages8
JournalPlant and Cell Physiology
Issue number8
Publication statusPublished - 2004 Aug
Externally publishedYes


  • Arabidopsis
  • Degradation
  • PIF3
  • Phytochrome
  • Ubiquitination

ASJC Scopus subject areas

  • Physiology
  • Plant Science
  • Cell Biology


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