F-box Protein Arabidillo-1 Promotes Lateral Root Development by Depressing the Functioning of GA3 in Arabidopsis

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• 作者：Changjun Mu (1)
  Ni Chen (1)
  Xiaofeng Li (1)
  Pengfei Jia (1)
  Zhaoyan Wang (2)
  Heng Liu (1)
  
• 关键词：Arabidillo ; 1 ; Armadillo ; F ; box ; GA ; Lateral roots
• 刊名：Journal of Plant Biology
• 出版年：2010
• 出版时间：October 2010
• 年：2010
• 卷：53
• 期：5
• 页码：374-380
• 全文大小：448KB
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• 作者单位：Changjun Mu (1)
  Ni Chen (1)
  Xiaofeng Li (1)
  Pengfei Jia (1)
  Zhaoyan Wang (2)
  Heng Liu (1)
  
  1. Institute of Cell Biology, School of Life Science, Lanzhou University, Lanzhou, 730000, People’s Republic of China
  2. School of Pharmaceutical, Lanzhou University, Lanzhou, 730000, People’s Republic of China
  

文摘

In Arabidopsis, Arabidillo-1 and Arabidillo-2 have great sequence homology to Dictyostelium and metazoan β–catenin/Armadillo, which are important to animal and Dictyostelium development. Arabidillo-1 and Arabidillo-2 promote lateral root formation redundantly in Arabidopsis. Here, we showed that gibberellins (GA3) has a greater inhibitory effect on lateral root growth from the null mutant arabidillo-1 than from the wild type, suggesting that the mechanism for Arabidillo-1-regulated modulation of lateral root proliferation is associated with GA3-metabolic or signaling pathways. Our yeast two-hybrid analysis demonstrated that Arabidillo-1 interacts with ASK2 and ASK11, and that ASK2 can bind with the F-box domain of Arabidillo-1. Therefore, Arabidillo-1 is involved in the ubiquitin/26S proteasome-mediated proteolytic pathway. Based on these results, we conclude that Arabidillo-1 can degrade some positive regulator of the GA3 signaling pathway through selective protein degradation of ubiquitin/26S. Moreover, that process is believed to be the mechanism for Arabidillo-1 promotion of lateral root development in Arabidopsis.