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Relationship between folding and function in a sequence-specific miniature DNA-binding protein.

Loretta Yang1, Alanna Schepartz

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, Connecticut 06520, USA.

Biochemistry
|May 18, 2005
PubMed
Summary
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Researchers investigated miniature proteins designed to bind DNA. They found that specific protein-DNA contacts and a stable core structure, not just alpha-helical content, determine binding affinity and specificity.

Area of Science:

  • Protein engineering
  • Molecular biology
  • Biophysics

Background:

  • Miniature proteins offer a scaffold for high-affinity, specific DNA-binding molecules.
  • Avian pancreatic polypeptide serves as a scaffold for recognition epitopes.
  • The p007 miniature protein, derived from this approach, binds DNA with high affinity and specificity.

Purpose of the Study:

  • To elucidate the role of individual residues in p007's DNA binding affinity, specificity, and secondary structure.
  • To understand the contribution of specific and non-specific DNA contacts to p007 function.
  • To investigate the relationship between secondary structure and binding characteristics.

Main Methods:

  • Alanine-scanning mutagenesis was employed to systematically alter 29 residues in p007.

Related Experiment Videos

  • DNA binding affinity and specificity were assessed for p007 variants.
  • Secondary structure content (alpha-helicity) was analyzed.

    • Main Results:

    • Nearly all residues in the p007 alpha-helix and most in the PPII helix are crucial for DNA affinity and specificity.
    • A direct correlation exists between p007 variant affinity for specific DNA and its ability to discriminate against non-specific DNA.
    • While alpha-helicity showed no correlation with affinity, it had a limited correlation with sequence specificity, highlighting coupled folding and binding.

    Conclusions:

    • The formation of extensive protein-DNA contacts within a well-packed hydrophobic core is the primary driver of p007's function.
    • Intrinsic alpha-helical structure extent is less critical than evolved contact formation for miniature protein performance.
    • These findings advance the design principles for artificial DNA-binding proteins.