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Related Experiment Videos

-GG- specific cleavage via hole hopping through double-stranded DNA

T Nakamura1, C Dohno, K Nakatani

  • 1Department of Synthetic Chemistry and Biological Chemistry, Faculty of Engineering, Kyoto University, Japan.

Nucleic Acids Symposium Series
|January 1, 1997
PubMed
Summary

The 5' side base significantly influences DNA cleavage selectivity at 5'-GGG-3' sequences. This finding is crucial for understanding photoinduced DNA damage and repair mechanisms.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Photochemistry

Background:

  • Photoinduced DNA cleavage is a critical process in understanding DNA damage and repair.
  • The sequence context of DNA, particularly GGG repeats, can influence its susceptibility to cleavage.
  • Oligodeoxyribonucleotides are valuable tools for studying DNA-protein interactions and DNA damage mechanisms.

Purpose of the Study:

  • To investigate the sequence-specific DNA cleavage of oligodeoxyribonucleotides induced by photoirradiation.
  • To determine the role of the 5' base preceding a 5 -GGG-3 sequence in photoinduced DNA cleavage.
  • To elucidate the mechanism of sequence selectivity in DNA cleavage reactions.

Main Methods:

  • Synthesis of 32P-end labeled oligodeoxyribonucleotides with specific sequences (5 -TGGGC-3 , 5 -CGGGC-3 , and 5 -TGGGT-3 ).

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  • Irradiation of labeled oligonucleotides to induce photo-cleavage.
  • Analysis of cleavage products using gel electrophoresis to determine cleavage sites.

    • Main Results:

    • Cleavage predominantly occurred at the middle of the 5 -GGG-3 step for 5 -TGGGC-3 and 5 -TGGGT-3 sequences.
    • Cleavage occurred preferentially at the 5 side of the 5 -GGG-3 step in the 5 -CGGGC-3 sequence.
    • The base at the 5 side of the 5 -GGG-3 step was identified as a critical determinant of cleavage site selectivity.

    Conclusions:

    • The 5 base adjacent to a 5 -GGG-3 sequence plays a crucial role in directing photoinduced DNA cleavage.
    • Understanding sequence-dependent DNA cleavage is vital for predicting and potentially mitigating DNA damage.
    • This study provides insights into the sequence selectivity of DNA cleavage reactions, relevant to photochemistry and molecular biology.