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  • The EMBO Journal (2001) 20, 2004 - 2014
  • doi:10.1093/emboj/20.8.2004

ATP-dependent chromatin remodeling facilitates nucleotide excision repair of UV-induced DNA lesions in synthetic dinucleosomes

Kiyoe Ura1, Marito Araki2,3, Hideaki Saeki1, Chikahide Masutani2, Takashi Ito4, Shigenori Iwai5, Toshimi Mizukoshi5, Yasufumi Kaneda1 and Fumio Hanaoka2

  1. Division of Gene Therapy Science, Osaka University School of Medicine, 2-2 Yamada-oka, Suita, Japan
  2. Institute for Molecular and Cellular Biology, Osaka University and CREST, JST, 1-3 Yamada-oka, Suita, Osaka 565-0870, Japan
  3. Present address: Department of Genetics, Box 3657, Duke University Medical Center, Durham, NC 27710, USA
  4. Second Department of Biochemistry, Saitama Medical School, Moroyama, Iruma-gun, Saitama 350-0495, USA
  5. Biomolecular Engineering Research Institute, 6-2-3 Furuedai, Suita, Osaka 565-0874, Japan

Correspondence to:

Kiyoe Ura, E-mail: kiyoeura@gts.med.osaka-u.ac.jp

Received 26 October 2000; Accepted 23 February 2001; Revised 23 February 2001

To investigate the relationship between chromatin dynamics and nucleotide excision repair (NER), we have examined the effect of chromatin structure on the formation of two major classes of UV-induced DNA lesions in reconstituted dinucleosomes. Furthermore, we have developed a model chromatin-NER system consisting of purified human NER factors and dinucleosome substrates that contain pyrimidine (6-4) pyrimidone photoproducts (6-4PPs) either at the center of the nucleosome or in the linker DNA. We have found that the two classes of UV-induced DNA lesions are formed efficiently at every location on dinucleosomes in a manner similar to that of naked DNA, even in the presence of histone H1. On the other hand, excision of 6-4PPs is strongly inhibited by dinucleosome assembly, even within the linker DNA region. These results provide direct evidence that the human NER machinery requires a space greater than the size of the linker DNA to excise UV lesions efficiently. Interestingly, NER dual incision in dinucleosomes is facilitated by recombinant ACF, an ATP-dependent chromatin remodeling factor. Our results indicate that there is a functional connection between chromatin remodeling and the initiation step of NER.

  • Keywords:

    • ACF,
    • chromatin remodeling,
    • DNA damage,
    • nucleosome,
    • nucleotide excision repair