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Related Experiment Videos

Synthesis, purification and sample experiment for fluorescent pteridine-containing DNA: tools for studying DNA

Mary E Hawkins1

  • 1National Cancer Institute, NIH, Pediatric Oncology Branch, 10 Center Drive, CRC 1-3872, Bethesda, Maryland 20854, USA. mh100x@nih.gov

Nature Protocols
|April 21, 2007
PubMed
Summary
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This study details a protocol for incorporating fluorescent nucleoside analogs into DNA. These probes enable direct measurement of DNA interactions and structural changes, offering valuable insights into molecular processes.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Organic Chemistry

Background:

  • Fluorescent nucleoside analogs are crucial for studying DNA interactions.
  • Direct measurement of fluorescence properties offers insights into DNA structure and reactions.
  • Existing methods require optimization for efficient probe incorporation and purification.

Purpose of the Study:

  • To describe an optimized protocol for synthesizing DNA containing fluorescent nucleoside analogs.
  • To detail methods for efficient probe phosphoramidite usage, purification of specific sequences, and deprotection.
  • To provide examples of expected fluorescence signals and timeframes for synthesis and purification.

Main Methods:

  • Modifications to standard DNA synthesis protocols for probe phosphoramidite incorporation.

Related Experiment Videos

  • Specific purification techniques for pteridine-containing DNA sequences.
  • A specialized deprotection procedure for 6-methylisocytosine (6MI)-containing sequences.
  • Automated DNA synthesis, polyacrylamide gel purification, electroelution, and ethanol precipitation.

    • Main Results:

    • Probe incorporation yields are comparable to standard phosphoramidites.
    • Automated synthesis of a 20-mer sequence takes 4-5 hours.
    • 6MI sequence deprotection requires 6-7 hours prior to overnight incubation.
    • Purification steps can be completed within 6-8 hours.

    Conclusions:

    • The described protocol enables efficient synthesis and purification of fluorescently labeled DNA.
    • These fluorescent probes facilitate the study of DNA interactions and structural dynamics.
    • The protocol provides a reliable method for generating custom DNA probes for various research applications.