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Related Experiment Videos

Strandedness discrimination in peptide-polynucleotide complexes

N P Johnson1, H Mazarguil, A Lopez

  • 1Institut de Pharmacologie et de Biologie Structurale, CNRS, 205, route de Narbonne, 31077 Toulouse, France.

The Journal of Biological Chemistry
|August 16, 1996
PubMed
Summary

Researchers explored how peptides bind to single- and double-stranded nucleic acids. Non-electrostatic interactions dominate binding, but electrostatic forces fine-tune affinity for single-stranded DNA (ssDNA) and RNA.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Proteins interacting with nucleic acids often exhibit preferences for single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA).
  • The RecA protein, a bacterial recombinase, demonstrates modulated affinity for ssDNA through ATP binding and hydrolysis, highlighting the importance of understanding nucleic acid binding mechanisms.

Purpose of the Study:

  • To investigate the mechanism of strandedness discrimination in nucleic acid binding using peptides from the RecA protein's DNA-binding domain.
  • To evaluate the contributions of electrostatic and non-electrostatic interactions to peptide binding with single- and double-stranded polynucleotides.

Main Methods:

  • Utilized fluorescence spectroscopy to assess peptide-polynucleotide interactions.
  • Varied salt concentration and peptide charge to analyze binding mechanisms.

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  • Conducted control experiments with tripeptides containing charged and aromatic amino acid residues.

    • Main Results:

    • Peptide binding to both single- and double-stranded nucleic acids was primarily driven by non-electrostatic interactions.
    • Small electrostatic contributions were found to selectively enhance peptide complexation with single-stranded nucleic acids.
    • Modifying electrostatic contributions altered the strandedness preference of peptide-polynucleotide complexes.

    Conclusions:

    • Non-electrostatic interactions are key drivers of peptide binding to nucleic acids.
    • Electrostatic interactions play a crucial role in fine-tuning the specificity for single-stranded nucleic acids.
    • These findings suggest a potential regulatory mechanism for proteins interacting with DNA or RNA to control their affinity for different nucleic acid structures.