Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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A novel F-box protein with leucine-rich repeats affects defecation frequency and daumone response in Caenorhabditis elegans

  • Kim, Sung-Moon (Graduate School of Biology and Information Technology, Institute of Genetic Engineering, Hankyong National University) ;
  • Jang, Sang-Ho (Graduate School of Biology and Information Technology, Institute of Genetic Engineering, Hankyong National University) ;
  • Son, Na-Rae (Graduate School of Biology and Information Technology, Institute of Genetic Engineering, Hankyong National University) ;
  • Han, Ching-Tack (Department of Life Science, Sogang University) ;
  • Min, Kwan-Sik (Graduate School of Biology and Information Technology, Institute of Genetic Engineering, Hankyong National University) ;
  • Lee, Hak-Kyo (Department of Bioengineering, Hankyong National University) ;
  • Hwang, Sue-Yun (Graduate School of Biology and Information Technology, Institute of Genetic Engineering, Hankyong National University)
  • Received : 2012.02.02
  • Accepted : 2012.02.07
  • Published : 2012.08.31
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Abstract

Targeted degradation of proteins through ubiquitin-mediated proteolysis is an important control mechanism in various cellular processes. The process of ubiquitin conjugation is achieved by three enzyme complexes, among which the ubiquitin ligase complex (E3) is in charge of substrate specificity. The SCF (SKP1-CUL1-F-box) family portrays the largest and the most characterized member of the E3 ligases. For each SCF complex, the ubiquitination target is recognized by the F-box protein subunit, which interacts with the substrate through a unique C-terminal domain. We have characterized a novel F-box protein CFL-1 that represents a single LRR-type F-box (FBXL) in the Caenorhabditis elegans genome. CFL-1 is highly homologous to FBXL20 and FBXL2 of mammals, which are known to regulate synaptic vesicle release and cell cycle, respectively. A green fluorescence protein (GFP)-reporter gene fused to the cfl-1 promoter showed restricted expression around the amphid and the anus. Modulation of CFL-1 activity by RNAi affected the time interval between defecations. RNAi-treated worms also exhibited reduced tendency to form dauer when exposed to daumone. The potential involvement of CFL-1 in the control of defecation and pheromone response adds to the ever expanding list of cellular processes controlled by ubiquitin-mediated proteolysis in C. elegans. We suggest that CFL-1, as a single LRR-type F-box protein in C. elegans, may portray a prototype gene exerting diverse functions that are allocated among multiple FBXLs in higher organisms.

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References

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