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Investigating structural changes induced by nucleotide binding to RecA using difference FTIR.

Blaine C Butler1, Ross H Hanchett, Helena Rafailov

  • 1Department of Chemistry, James Madison University, Harrisonburg, Virginia 22807, USA.

Biophysical Journal
|March 28, 2002
PubMed
Summary
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Researchers used caged nucleotides and FTIR to study RecA protein structural changes upon Adenosine 5'-triphosphate (ATP) or Adenosine 5'-diphosphate (ADP) binding. Infrared data reveal distinct structural rearrangements linked to RecA

Area of Science:

  • Structural Biology
  • Biochemistry
  • Molecular Biology

Background:

  • RecA protein's DNA binding affinity is modulated by bound nucleotides, differentiating between high-affinity Adenosine 5 '-triphosphate (ATP)-bound and low-affinity Adenosine 5 '-diphosphate (ADP)-bound states.
  • Significant structural disparities between RecA-ATP and RecA-ADP forms remain incompletely understood.

Purpose of the Study:

  • To comprehensively elucidate the molecular alterations in RecA protein induced by nucleotide binding.
  • To characterize the structural differences between the high- and low-DNA affinity RecA forms.

Main Methods:

  • Utilized caged nucleotides for controlled photochemical release, initiating nucleotide binding to RecA.
  • Employed difference Fourier Transform Infrared (FTIR) spectroscopy in H2O and D2O to analyze protein structural changes.

Related Experiment Videos

  • Conducted ATP hydrolysis assays and fluorescence studies to validate caged nucleotide behavior.

    • Main Results:

    • Caged nucleotides demonstrated no pre-photolysis interaction with RecA, ensuring accurate initiation of binding.
    • Difference FTIR spectra indicated unique alpha-helical, beta-sheet, and side-chain rearrangements correlating with high- and low-DNA affinity states.
    • Time-resolved difference spectra identified perturbations in nucleotide phosphates, providing insights into protein structural dynamics.

    Conclusions:

    • Nucleotide binding induces distinct structural changes in RecA, differentiating its high- and low-DNA affinity conformations.
    • FTIR spectroscopy is effective in identifying specific protein structural rearrangements associated with nucleotide binding.
    • The study provides crucial information on the allosteric regulation mechanisms of RecA protein.