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Related Experiment Videos

Actinomycin D binding to unstructured, single-stranded DNA.

H Yoo1, R L Rill

  • 1Department of Chemistry and Institute of Molecular Biophysics The Florida State University, Tallahassee, Florida, USA.

Journal of Molecular Recognition : JMR
|June 8, 2001
PubMed
Summary
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Actinomycin D binds tightly to specific single-stranded DNA sequences, with an eight-nucleotide sequence showing the highest affinity. This binding does not require pre-existing DNA structure, suggesting an induced-fit mechanism for anticancer drug interaction.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Pharmacology

Background:

  • Actinomycin D is an anticancer drug known for binding double-stranded DNA and inhibiting transcription.
  • Its binding to single-stranded DNA is implicated in biological activities, such as inhibiting HIV reverse transcriptase.
  • Specific single-stranded DNA sequences, like d(GTTAACCATAG), exhibit high affinity for actinomycin D.

Purpose of the Study:

  • To investigate the sequence and length requirements for actinomycin D binding to single-stranded DNA.
  • To identify the minimal sequence length necessary for high-affinity binding.
  • To explore the role of DNA secondary structure in actinomycin D binding.

Main Methods:

  • Utilized a fluorescent analog, 7-aminoactinomycin D, to monitor drug binding.

Related Experiment Videos

  • Studied the binding affinity to d(GTTAACCATAG) and 31 related single-stranded DNA oligomers.
  • Determined binding affinities (Kd values) for various oligonucleotide sequences and lengths.

    • Main Results:

    • High-affinity binding required a TAG sequence at or near the 3'-terminus.
    • An eight-nucleotide sequence, d(AACCATAG), demonstrated the highest drug affinity (Kd = 125 nM).
    • This minimal binding sequence is unstructured in the absence of actinomycin.

    Conclusions:

    • High-affinity binding of actinomycin D to single-stranded DNA does not necessitate pre-existing secondary structure.
    • An induced-fit mechanism is proposed for actinomycin D binding to specific single-stranded DNA sequences.
    • The minimum length for tight binding involves at least eight nucleotides.