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Related Experiment Videos

Structural organization of Staf-DNA complexes.

M Schaub1, A Krol, P Carbon

  • 1UPR 9002 du CNRS 'Structure des Macromolécules Biologiques et Mécanismes de Reconnaissance', IBMC, 15 rue René Descartes, 67084 Strasbourg Cedex, France.

Nucleic Acids Research
|April 25, 2000
PubMed
Summary
This summary is machine-generated.

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The Staf transactivator binds gene promoters using its zinc finger domain. Zinc fingers 3-6 are crucial for high-affinity binding to specific snRNA and tRNA motifs.

Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Protein-DNA Interactions

Background:

  • The transactivator Staf (Signal Transducer and Activator of Transcription Factor) is a protein crucial for gene expression.
  • Staf contains seven C(2)-H(2) type zinc fingers, mediating its interaction with DNA.
  • Staf binds to specific targets in vertebrate small nuclear RNA (snRNA) and snRNA-type gene promoters.

Purpose of the Study:

  • To investigate the interaction mode between the Staf zinc finger domain and its target motifs.
  • To identify the minimal zinc finger region responsible for high-affinity binding.
  • To elucidate the Staf-DNA binding mechanism at the xtRNA(Sec) and hU6 sites.

Main Methods:

  • Generation of Staf polypeptides with varying numbers of zinc fingers.

Related Experiment Videos

  • Binding assays to quantify Staf-DNA interactions.
  • Interference techniques and binding site selection assays.
  • Analysis of DNA major groove contacts.

    • Main Results:

    • Zinc fingers 3-6 constitute the minimal region for high-affinity Staf binding.
    • Staf exhibits extensive contacts with the DNA major groove.
    • Staf preferentially associates with the non-template DNA strand.
    • A detailed model for Staf zinc finger-DNA interaction was proposed.

    Conclusions:

    • The Staf zinc finger domain utilizes specific fingers for high-affinity binding to snRNA and tRNA gene promoters.
    • The interaction involves extensive contacts within the DNA major groove.
    • Understanding this interaction provides insights into gene regulation mechanisms.