Browse

A phytochrome-associated protein phosphatase 2A modulates light signals in flowering time control in Arabidopsis

Cited 86 time in Web of Science Cited 95 time in Scopus
Authors
Kim, Dae-Hwan; Kang, Jeong-Gu; Yang, Song-Sook; Chung, Kyung-Sook; Song, Pill-Soon; Park, Chung-Mo
Issue Date
2002-12
Citation
Plant Cell, Vol.14 No.12, pp.3043-3056
Abstract
Reversible protein phosphorylation, which is catalyzed by functionally coupled protein kinases and protein phosphatases, is a major signaling mechanism in eukaryotic cellular functions. The red and far-red light-absorbing phytochrome photoreceptors are light-regulated Ser/Thr-specific protein kinases that regulate diverse photomorphogenic processes in plants. Here, we demonstrate that the phytochromes functionally interact with the catalytic subunit of a Ser/Thr-specific protein phosphatase 2A designated FyPIP. The interactions were influenced by phosphorylation status and spectral conformation of the phytochromes. Recombinant FyPP efficiently dephosphorylated oat phytochrome A in the presence of Fe2+ or Zn2+ in a spectral form-dependent manner. FyPP was expressed predominantly in floral organs. Transgenic Arabidopsis plants with overexpressed or suppressed FyPP levels exhibited delayed or accelerated flowering, respectively, indicating that FyPP modulates phytochrome-mediated light signals in the timing of flowering. Accordingly, expression patterns of the clock genes in the long-day flowering pathway were altered greatly. These results indicate that a self-regulatory phytochrome kinase-phosphatase coupling is a key signaling component in the photoperiodic control of flowering.
ISSN
1040-4651
URI
https://hdl.handle.net/10371/172025
DOI
https://doi.org/10.1105/tpc.005306
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse