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Science 299 (5614): 1896-1898

Copyright © 2003 by the American Association for the Advancement of Science

Accumulation of Phosphorylated Repressor for Gibberellin Signaling in an F-box Mutant

Akie Sasaki,1* Hironori Itoh,1* Kenji Gomi,1 Miyako Ueguchi-Tanaka,1 Kanako Ishiyama,2 Masatomo Kobayashi,2 Dong-Hoon Jeong,3 Gynheung An,3 Hidemi Kitano,4 Motoyuki Ashikari,1 Makoto Matsuoka1dagger

Gibberellin (GA) regulates growth and development in plants. We isolated and characterized a rice GA-insensitive dwarf mutant, gid2. The GID2 gene encodes a putative F-box protein, which interacted with the rice Skp1 homolog in a yeast two-hybrid assay. In gid2, a repressor for GA signaling, SLR1, was highly accumulated in a phosphorylated form and GA increased its concentration, whereas SLR1 was rapidly degraded by GA through ubiquitination in the wild type. We conclude that GID2 is a positive regulator of GA signaling and that regulated degradation of SLR1 is initiated through GA-dependent phosphorylation and finalized by an SCFGID2-proteasome pathway.

1 BioScience Center, Nagoya University, Nagoya 464-8601, Japan.
2 BioResources Center, Riken, Tsukuba 305-0074, Japan.
3 Division of Molecular and Life Science, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea.
4 Graduate School of Bioagricultural Science, Nagoya University, Nagoya 464-8601, Japan.
*   These authors contributed equally to this work.

dagger    To whom correspondence should be addressed. E-mail: makoto{at}agr.nagoya-u.ac.jp

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X. Fu, D. E. Richards, B. Fleck, D. Xie, N. Burton, and N. P. Harberd (2004)
PLANT CELL 16, 1406-1418
   Abstract »    Full Text »    PDF »
A Rice WRKY Gene Encodes a Transcriptional Repressor of the Gibberellin Signaling Pathway in Aleurone Cells.
Z.-L. Zhang, Z. Xie, X. Zou, J. Casaretto, T.-h. D. Ho, and Q. J. Shen (2004)
Plant Physiology 134, 1500-1513
   Abstract »    Full Text »    PDF »
OsEIN2 is a Positive Component in Ethylene Signaling in Rice.
S.-H. Jun, M.-J. Han, S. Lee, Y. S. Seo, W. T. Kim, and G. An (2004)
Plant Cell Physiol. 45, 281-289
   Abstract »    Full Text »    PDF »
Gibberellin regulates Arabidopsis floral development via suppression of DELLA protein function.
H. Cheng, L. Qin, S. Lee, X. Fu, D. E. Richards, D. Cao, D. Luo, N. P. Harberd, and J. Peng (2004)
Development 131, 1055-1064
   Abstract »    Full Text »    PDF »
Loss-of-Function Mutations of the Rice GAMYB Gene Impair {alpha}-Amylase Expression in Aleurone and Flower Development.
M. Kaneko, Y. Inukai, M. Ueguchi-Tanaka, H. Itoh, T. Izawa, Y. Kobayashi, T. Hattori, A. Miyao, H. Hirochika, M. Ashikari, et al. (2004)
PLANT CELL 16, 33-44
   Abstract »    Full Text »    PDF »
Ethylene Regulates Arabidopsis Development via the Modulation of DELLA Protein Growth Repressor Function.
P. Achard, W. H. Vriezen, D. Van Der Straeten, and N. P. Harberd (2003)
PLANT CELL 15, 2816-2825
   Abstract »    Full Text »    PDF »
Members of the Arabidopsis-SKP1-like Gene Family Exhibit a Variety of Expression Patterns and May Play Diverse Roles in Arabidopsis.
D. Zhao, W. Ni, B. Feng, T. Han, M. G. Petrasek, and H. Ma (2003)
Plant Physiology 133, 203-217
   Abstract »    Full Text »    PDF »
The Arabidopsis SLEEPY1 Gene Encodes a Putative F-Box Subunit of an SCF E3 Ubiquitin Ligase.
K. M. McGinnis, S. G. Thomas, J. D. Soule, L. C. Strader, J. M. Zale, T.-p. Sun, and C. M. Steber (2003)
PLANT CELL 15, 1120-1130
   Abstract »    Full Text »    PDF »

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