Journal Article

Degradation of Phytochrome Interacting Factor 3 in Phytochrome-Mediated Light Signaling

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

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 45, issue 8, pages 968-975
Published in print August 2004 | ISSN: 0032-0781
Published online August 2004 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pch125
Degradation of Phytochrome Interacting Factor 3 in Phytochrome-Mediated Light Signaling

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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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.

Keywords: Keywords: Arabidopsis — Degradation — Phytochrome — PIF3 — Ubiquitination.; Abbreviation: PIF3, phytochrome interacting factor 3.

Journal Article.  5486 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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