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Lee, Jae-Hoon,Terzaghi, William,Gusmaroli, Giuliana,Charron, Jean-Benoit F,Yoon, Hye-Jin,Chen, Haodong,He, Yizhou Joseph,Xiong, Yue,Deng, Xing Wang American Society of Plant Physiologists 2008 The Plant cell Vol.20 No.1
<P>A subset of WD40 proteins that contain a DWD motif (for DDB1 binding WD40) is reported to act as substrate receptors for DDB1-CUL4-ROC1 (for Damaged DNA Binding 1-Cullin 4-Regulator of Cullins 1) based E3 ubiquitin ligases in humans. Here, we report 85 Arabidopsis thaliana and 78 rice (Oryza sativa) proteins containing the conserved 16-amino acid DWD motif. We show by yeast two-hybrid and in vivo coimmunoprecipitation that 11 Arabidopsis DWD proteins directly interact with DDB1 and thus may serve as substrate receptors for the DDB1-CUL4 machinery. We further examine whether the DWD protein PRL1 (for Pleiotropic Regulatory Locus 1) may act as part of a CUL4-based E3 ligase. PRL1 directly interacts with DDB1, and prl1 and cul4cs mutants exhibited similar phenotypes, including altered responses to a variety of stimuli. Moreover, AKIN10 (for Arabidopsis SNF1 Kinase Homolog 10) was degraded more slowly in cell extracts of prl1 and cul4cs than in cell extracts of the wild type. Thus, both genetic and biochemical analyses support the conclusion that PRL1 is the substrate receptor of a CUL4-ROC1-DDB1-PRL1 E3 ligase involved in the degradation of AKIN10. This work adds a large new family to the current portfolio of plant E3 ubiquitin ligases.</P>
The PP6 Phosphatase Regulates ABI5 Phosphorylation and Abscisic Acid Signaling in <i>Arabidopsis</i>
Dai, Mingqiu,Xue, Qin,Mccray, Tyra,Margavage, Kathryn,Chen, Fang,Lee, Jae-Hoon,Nezames, Cynthia D.,Guo, Liquan,Terzaghi, William,Wan, Jianmin,Deng, Xing Wang,Wang, Haiyang American Society of Plant Biologists 2013 The Plant cell Vol.25 No.2
<P>This study shows that two catalytic subunits of <I>Arabidopsis</I> protein phosphatase 6 (i.e., FyPP1 and FyPP3) negatively regulate abscisic acid responses through direct interaction with and dephosphorylation of ABI5, which subsequently regulates ABI5 stability and activity, seed germination, and postgermination seedling growth in <I>Arabidopsis</I>.</P>