Phosphorylation of EL1 on SLR1 is crucial for GA signalling.

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Phosphorylation of EL1 on SLR1 is crucial for GA signalling. Phosphorylation of EL1 on SLR1 is crucial for GA signalling. (A) After GA3 treatment (100 μM, 1 h), expressions of GA20ox2 and OsGA3ox2 were decreased in WT plants overexpressing mutated SLR1m–YFP (S196A, S510A, and S196A/S510A, which results in the suppressed phosphorylation of these sites), revealing the enhanced GA responses. On the opposite, the expressions of GA20ox2 and OsGA3ox2 were increased in WT plants overexpressing mutated SLR1m–YFP (S510D, S196D/S510D, which results in the constitutive phosphorylation of these sites), revealing the suppressed GA responses. qRT–PCR analysis was performed and heteroscedastic t‐test analysis indicated a significant difference (**P<0.01). Expression of the corresponding genes in WT expressing SLR1–GFP without GA3 treatment was set as 1.0. Western blot analysis confirmed the similar levels of proteins (SLR1–YFP, and SLR1m–YFP) in all of the transgenic lines before GA treatment (bottom panel). (B) Hypothetical model of EL1 function in GA signalling. EL1 is repressed by GA and phosphorylation of EL1 on the SLR1 C‐terminus sustains its active form (in red). Phosphorylation on the SLR1 N‐terminus suppresses the GID1–GA‐mediated degradation of SLR1, resulting in the suppressed GA responses. Cheng Dai, and Hong‐Wei Xue EMBO J. 2010;29:1916-1927 © as stated in the article, figure or figure legend