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Related Experiment Videos

Echinomycin binding to alternating AT.

K R Fox1, J N Marks, K Waterloh

  • 1Department of Physiology & Pharmacology, University of Southampton, UK.

Nucleic Acids Research
|December 25, 1991
PubMed
Summary
This summary is machine-generated.

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Echinomycin preferentially binds to ApT sites in DNA, forming cooperative complexes. This binding is influenced by flanking GC-rich regions and AT blocks, revealing specific DNA-drug interactions.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Echinomycin is a cyclic peptide antibiotic known to bind DNA.
  • GC-rich DNA sequences are often targets for small molecule binding.
  • Understanding sequence-specific DNA-drug interactions is crucial for drug development.

Purpose of the Study:

  • To investigate the binding mechanism of echinomycin to DNA fragments.
  • To elucidate the role of GC-rich regions and flanking AT blocks in echinomycin binding.
  • To identify specific DNA sequence motifs recognized by echinomycin.

Main Methods:

  • DNase I footprinting assays to map DNA-drug binding sites.
  • Diethylpyrocarbonate (DEPC) modification to probe DNA accessibility.

Related Experiment Videos

  • Analysis of DNA fragments with varying GC and AT content.

    • Main Results:

    • Echinomycin binding exhibits a distinct four base pair cleavage pattern in DNase I footprints at alternating AT regions flanking GC-rich sites.
    • Diethylpyrocarbonate modification reveals reaction of alternate adenines within these AT blocks.
    • The observed patterns suggest cooperative binding of echinomycin to ApT dinucleotide steps, with transmission through GC steps.
    • Secondary binding sites were identified at CpC and TpG, with weaker interaction at CpG sites.

    Conclusions:

    • Echinomycin binds cooperatively to ApT dinucleotide steps, influenced by flanking AT and GC sequences.
    • The DNA sequence context, particularly alternating AT blocks adjacent to GC-rich regions, dictates echinomycin binding patterns.
    • These findings provide insights into the sequence-specific recognition of DNA by echinomycin, relevant for understanding its biological activity.