Dissection of the Phosphorylation of Rice DELLA Protein, SLENDER RICE1
| Autor: | Eiichi Minami, Akie Sasaki, Makoto Matsuoka, Kanako Ishiyama, Miyako Ueguchi-Tanaka, Yasuko Hasegawa, Masatomo Kobayashi, Hironori Itoh, Motoyuki Ashikari |
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| Rok vydání: | 2005 |
| Předmět: |
inorganic chemicals
Physiology Proteolysis Mutant Repressor Plant Science environment and public health F-box protein Serine medicine Protein phosphorylation Phosphorylation Plant Proteins biology medicine.diagnostic_test Hydrolysis food and beverages Oryza Cell Biology General Medicine Chromatography Ion Exchange Gibberellins Cell biology enzymes and coenzymes (carbohydrates) Biochemistry biology.protein bacteria Gibberellin |
| Zdroj: | Plant and Cell Physiology. 46:1392-1399 |
| ISSN: | 1471-9053 0032-0781 |
| Popis: | DELLA proteins are repressors of gibberellin signaling in plants. Our previous studies have indicated that gibberellin signaling is derepressed by SCF(GID2)-mediated proteolysis of the DELLA protein, SLENDER RICE1 (SLR1), in rice. In addition, the gibberellin-dependent increase of phosphorylated SLR1 in the loss-of-function gid2 mutant suggests that the SCF(GID2)-mediated degradation of SLR1 might be initiated by gibberellin-dependent phosphorylation. To confirm the role of phosphorylation of SLR1 in its gibberellin-dependent degradation, we revealed that SLR1 is phosphorylated on an N-terminal serine residue(s) within the DELLA/TVHYNP and polyS/T/V domain. However, gibberellin-induced phosphorylation in these regions was not observed in the gid2 mutant following the constitutive expression of SLR1 under the control of the rice actin1 promoter. Treatment with gibberellin induced both the phosphorylated and non-phosphorylated forms of SLR1 with similar induction kinetics in gid2 mutant cells. Both the phosphorylated and non-phosphorylated SLR1 proteins were degraded by gibberellin treatment with a similar half-life in the rice callus cells, and both proteins interacted with recombinant glutathione S-transferase (GST)-GID2. These results demonstrate that the phosphorylation of SLR1 is independent of its degradation and is dispensable for the interaction of SLR1 with the GID2/F-box protein. |
| Databáze: | OpenAIRE |
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