Plant and Cell Physiology Advance Access originally published online on June 23, 2005
Plant and Cell Physiology 2005 46(8):1392-1399; doi:10.1093/pcp/pci152
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Dissection of the Phosphorylation of Rice DELLA Protein, SLENDER RICE1
1 Bioscience and Biotechnology Center, Nagoya University, Nagoya, Aichi, 464-8601 Japan
2 Department of Biochemistry, National Institute of Agrobiological Sciences, 2-1-2, Kannondai, Tsukuba, 305-8602 Japan
3 BioResources Center, RIKEN, Tsukuba, 305-0074 Japan
* Corresponding author: E-mail, makoto{at}nuagr1.agr.nagoya-u.ac.jp, Fax, +81-52-789-5226.
DELLA proteins are repressors of gibberellin signaling in plants. Our previous studies have indicated that gibberellin signaling is derepressed by SCFGID2-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 SCFGID2-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.
4 These authors contributed equally to this work.
(Received December 9, 2004; Accepted June 8, 2005)
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