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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Cloning of the Large Subunit of Replication Protein A (RPA) from Yeast Saccharomyces cerevisiae and Its DNA Binding Activity through Redox Potential

  • Jeong, Haeng-Soon (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Jeong, In-Chel (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kim, Andre (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kang, Shin-Won (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University) ;
  • Kang, Ho-Sung (Department of Molecular Biology, Pusan National University) ;
  • Kim, Yung-Jin (Department of Molecular Biology, Pusan National University) ;
  • Lee, Suk-Hee (Department of Biochemistry and Molecular Biology, Indiana University School of Medicine) ;
  • Park, Jang-Su (Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University)
  • Published : 2002.03.31
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Abstract

Eukaryotic replication protein A (RPA) is a single-stranded(ss) DNA binding protein with multiple functions in DNA replication, repair, and genetic recombination. The 70-kDa subunit of eukaryotic RPA contains a conserved four cysteine-type zinc-finger motif that has been implicated in the regulation of DNA replication and repair. Recently, we described a novel function for the zinc-finger motif in the regulation of human RPA's ssDNA binding activity through reduction-oxidation (redox). Here, we show that yeast RPA's ssDNA binding activity is regulated by redox potential through its RPA32 and/or RPA14 subunits. Yeast RPA requires a reducing agent, such as dithiothreitol (DTT), for its ssDNA binding activity. Also, under non-reducing conditions, its DNA binding activity decreases 20 fold. In contrast, the RPA 70 subunit does not require DTT for its DNA binding activity and is not affected by the redox condition. These results suggest that all three subunits are required for the regulation of RPA's DNA binding activity through redox potential.

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References

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