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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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The linker connecting the tandem ubiquitin binding domains of RAP80 is critical for lysine 63-linked polyubiquitin-dependent binding activity

  • Cho, Hyun-Jung (Department of Biological Science, Sungkyunkwan University) ;
  • Lee, Sang-Ho (Department of Biological Science, Sungkyunkwan University) ;
  • Kim, Hong-Tae (Department of Biological Science, Sungkyunkwan University)
  • Published : 2009.11.30
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Abstract

The tandem ubiquitin-interacting motif (UIM) domain located at the N-terminus of Receptor Associated Protein 80 (RAP80) plays a crucial role in ionizing radiation (IR)-induced DNA damage response. RAP80 translocates to sites of IR-induced DNA damage through interaction of its UIM domain with ubiquitinated H2A and Lys63-linked polyubiquitin chains. The exact mechanism, however, through which RAP80 associates with Lys63-linked polyubiquitin chains is not clear. Here, we show by in vitro GST-pull down assays that modifying the linker region between the tandem ubiquitin binding domains of RAP80 changes the binding affinity for Lys63-linked polyubiquitin chains and affects translocation to sites of DNA breaks. Based on these findings, we suggest that the length of the linker region between the tandem ubiquitin binding domains of RAP80 may be a key factor in the binding of RAP80 with Lys63-linked polyubiquitin chains as well as in the translocation of RAP80 to DNA break sites.

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