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Related Experiment Videos

Base sequence-dependent bends in site-specific benzo[a]pyrene diol epoxide-modified oligonucleotide duplexes

T Liu1, J Xu, H Tsao

  • 1Chemistry Department, New York University 10003, USA.

Chemical Research in Toxicology
|January 1, 1996
PubMed
Summary

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Benzo[a]pyrene diol epoxide (BPDE) modification of guanine in oligonucleotides alters DNA structure. BPDE adducts at specific positions cause sequence-dependent DNA bending, affecting electrophoretic mobility.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Chemical Biology

Background:

  • Polycyclic aromatic hydrocarbons (PAHs) like benzo[a]pyrene are environmental mutagens.
  • Covalent binding of benzo[a]pyrene diol epoxide (BPDE) to DNA, particularly guanine residues, forms adducts.
  • These DNA adducts can distort DNA structure and interfere with DNA replication and transcription.

Purpose of the Study:

  • To synthesize and characterize BPDE-modified oligonucleotides.
  • To investigate the impact of BPDE adduct position on DNA structure and electrophoretic mobility.
  • To elucidate the stereochemical and sequence-dependent effects of BPDE-guanine adducts.

Main Methods:

  • Chemical synthesis of modified oligonucleotides with specific guanine adducts.

Related Experiment Videos

  • Electrophoretic analysis of single-stranded and double-stranded DNA in polyacrylamide gels.
  • Comparative analysis of mobility shifts between modified and unmodified DNA duplexes.

    • Main Results:

    • (+)-anti-BPDE modification of guanine in oligonucleotides resulted in slower electrophoretic mobility in single-stranded forms, independent of adduct position.
    • In double-stranded DNA, BPDE adducts at G2 or G3 positions caused significant mobility retardation (up to 40%) compared to G1 adducts.
    • Sequence-dependent bending, attributed to steric hindrance between the BPDE adduct and 5'-flanking guanines, was observed for (+)-trans-stereochemistry adducts.
    • Anomalous mobility effects were not observed for (-)-anti-BPDE modified sequences.

    Conclusions:

    • The position and stereochemistry of BPDE-guanine adducts critically influence DNA conformation.
    • (+)-anti-BPDE adducts induce sequence-dependent DNA bending, altering electrophoretic behavior.
    • These findings provide insights into the structural consequences of PAH-DNA adducts and their potential biological impact.