Molecules and Cells

Korean Society for Molecular and Cellular Biology (한국분자세포생물학회)
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Nuclear Localization of Chfr Is Crucial for Its Checkpoint Function

  • Kwon, Young Eun (School of Biological Sciences, Research Center for Functional Cellulomics, Seoul National University) ;
  • Kim, Ye Seul (School of Biological Sciences, Research Center for Functional Cellulomics, Seoul National University) ;
  • Oh, Young Mi (School of Biological Sciences, Research Center for Functional Cellulomics, Seoul National University) ;
  • Seol, Jae Hong (School of Biological Sciences, Research Center for Functional Cellulomics, Seoul National University)
  • Received : 2008.12.02
  • Accepted : 2008.12.05
  • Published : 2009.03.31
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Abstract

Chfr, a checkpoint with FHA and RING finger domains, plays an important role in cell cycle progression and tumor suppression. Chfr possesses the E3 ubiquitin ligase activity and stimulates the formation of polyubiquitin chains by Ub-conjugating enzymes, and induces the proteasome-dependent degradation of a number of cellular proteins, including Plk1 and Aurora A. While Chfr is a nuclear protein that functions within the cell nucleus, how Chfr is localized in the nucleus has not been clearly demonstrated. Here, we show that nuclear localization of Chfr is mediated by nuclear localization signal (NLS) sequences. To reveal the signal sequences responsible for nuclear localization, a short lysine-rich stretch (KKK) at amino acid residues 257-259 was replaced with alanine, which completely abolished nuclear localization. Moreover, we show that nuclear localization of Chfr is essential for its checkpoint function but not for its stability. Thus, our results suggest that NLS-mediated nuclear localization of Chfr leads to its accumulation within the nucleus, which may be important in the regulation of Chfr activation and Chfr-mediated cellular processes, including cell cycle progression and tumor suppression.

Keywords

Acknowledgement

Supported by : Korea Research Foundation, Korea Science and Engineering Foundation, Korea Ministry of Education

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