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Related Experiment Videos

A zinc finger directory for high-affinity DNA recognition

A C Jamieson1, H Wang, S H Kim

  • 1Department of Chemistry, University of California, Berkeley 94720, USA.

Proceedings of the National Academy of Sciences of the United States of America
|November 12, 1996
PubMed
Summary

Researchers engineered zinc finger proteins to bind specific DNA sequences, discovering key interactions for high-affinity binding and creating a directory for DNA recognition. This advances understanding of protein-DNA interactions.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Zinc fingers are DNA-binding proteins crucial for gene regulation.
  • The Zif268 protein recognizes a specific DNA sequence (GCG TGGGCG).
  • Understanding zinc finger-DNA interactions is key to protein engineering.

Purpose of the Study:

  • To generate novel zinc fingers targeting variations in the Zif268 DNA-binding site.
  • To characterize the DNA-binding specificities of engineered zinc fingers.
  • To construct a comprehensive DNA recognition directory.

Main Methods:

  • Utilized monovalent phage display libraries with Zif268 variants.
  • Performed affinity selection by systematically altering the Zif268 operator sequence.

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  • Selected for families of zinc fingers binding to sets of 16 related DNA sequences.

    • Main Results:

    • High-affinity binding (Kd = 0.5-5 nM) requires specific arginine interactions with guanine in finger 1.
    • Lower-affinity binding (Kd ≥ 50 nM) was observed for altered bases (A, C, T), with a G-rich DNA preference.
    • Residues at position 2 of finger 2 showed minimal interaction with the finger 1 binding site.
    • Unexpected substitutions in finger 1 N-terminus enabled 3' base specificity.

    Conclusions:

    • Established critical residues for high-affinity zinc finger-DNA binding.
    • Demonstrated the ability to engineer zinc fingers for specific DNA triplet recognition.
    • Created a DNA recognition directory for GNN sequences, applicable to other zinc fingers.