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Related Experiment Videos

Selective visualization of gene structure with ultraviolet light.

Z Wang1, M M Becker

  • 1Department of Biological Sciences, University of Pittsburgh, PA 15260.

Proceedings of the National Academy of Sciences of the United States of America
|February 1, 1988
PubMed
Summary

Ultraviolet (UV) footprinting can detect specific protein-DNA interactions, like transcription factor IIIA (TFIIIA) binding, but not histone-DNA interactions in chromatin. This technique offers a way to visualize regulatory protein binding in vivo.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Chromatin structure involves DNA wrapped around histone proteins.
  • Understanding protein-DNA interactions is crucial for gene regulation.
  • Existing techniques have limitations in distinguishing different types of molecular contacts.

Purpose of the Study:

  • To investigate the utility of ultraviolet (UV) footprinting for detecting chromatin components.
  • To determine if UV footprinting can selectively identify regulatory protein-DNA interactions over histone-DNA interactions.

Main Methods:

  • Reconstitution of phased nucleosomes with and without histone H1 on sea urchin 5S ribosomal RNA gene.
  • Probing histone-DNA interactions using exonuclease III, DNase I, dimethyl sulfate, and UV light.

Related Experiment Videos

  • Assessing UV light's ability to detect sequence-specific binding of transcription factor IIIA (TFIIIA) to 5S DNA.

    • Main Results:

    • DNase I and exonuclease III detected histone-DNA interactions.
    • UV light and dimethyl sulfate failed to detect histone-DNA interactions.
    • UV light effectively detected sequence-specific contacts between TFIIIA and 5S DNA.
    • UV light sensitivity for TFIIIA was comparable to other regulatory protein-DNA contacts.

    Conclusions:

    • UV footprinting is not suitable for detecting general histone-DNA interactions within chromatin.
    • UV footprinting can selectively visualize sequence-specific regulatory protein-DNA interactions.
    • This technique holds promise for studying in vivo gene regulation with reduced interference from chromatin structure.