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Related Experiment Videos

Interaction of dimeric intercalating dyes with single-stranded DNA

H S Rye1, A N Glazer

  • 1Department of Molecular and Cell Biology, University of California, Berkeley 94720, USA.

Nucleic Acids Research
|April 11, 1995
PubMed
Summary
This summary is machine-generated.

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Thiazole orange homodimer (TOTO) and ethidium homodimer bind strongly to both single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA). These dyes show similar high affinity for both DNA forms, challenging previous assumptions.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Spectroscopy

Background:

  • Thiazole orange homodimer (TOTO) is a fluorescent dye known to bind DNA.
  • The binding characteristics of TOTO to single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) have not been fully elucidated.
  • Understanding dye-DNA interactions is crucial for various molecular biology applications.

Purpose of the Study:

  • To investigate whether TOTO exhibits a binding preference for ssDNA or dsDNA.
  • To compare the stability and affinity of TOTO-DNA complexes for both ssDNA and dsDNA.
  • To explore the binding behavior of other polycationic bis-intercalating dyes, such as ethidium homodimer (EthD).

Main Methods:

  • Gel electrophoresis was used to assay the transfer of TOTO from pre-labeled DNA complexes to excess unlabeled DNA.

Related Experiment Videos

  • Spectroscopic techniques including absorption, fluorescence, and circular dichroism were employed.
  • Experiments were conducted under varying salt (Na+, Mg2+) concentrations.

    • Main Results:

    • TOTO forms stable complexes with both ssDNA and dsDNA, with indistinguishable stability under standard electrophoresis conditions.
    • TOTO transfer assays revealed similar binding affinities for ssDNA and dsDNA, even in the presence of a large excess of competing DNA.
    • The TOTO-ssDNA complex showed greater intrinsic stability than the TOTO-dsDNA complex at higher salt concentrations.
    • Structurally similar results were observed with ethidium homodimer.

    Conclusions:

    • Polycationic bis-intercalating dyes like TOTO and EthD interact with both dsDNA and ssDNA with very similar high affinities.
    • This finding challenges the notion of a significant binding preference for dsDNA over ssDNA for these types of dyes.
    • The study provides new insights into the fundamental interactions between fluorescent dyes and nucleic acids.