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Published on: March 8, 2012
Specificity in DNA recognition by a peptide from papillomavirus E2 protein
Joana Faber-Barata1, Ronaldo Mohana-Borges, Luís Maurício T R Lima
1Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, CCS, sala Bs-34, Ilha do Fundão, 21941-590, Rio de Janeiro, RJ, Brazil.
FEBS Letters
|March 18, 2006
Summary
A short peptide (alpha1E2) from papillomavirus E2 proteins specifically recognizes DNA sequences. This peptide demonstrates sequence-specific DNA binding, highlighting its potential for nucleic acid recognition.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Papillomavirus E2 proteins bind specific double-stranded DNA sequences (ACCG-N4-CGGT).
- The DNA-recognition helix (alpha-helix-1) is crucial for protein-DNA interaction.
Purpose of the Study:
- To investigate the DNA binding and recognition capabilities of the alpha1E2 peptide.
- To determine if a short peptide can exhibit sequence-specific DNA binding.
Main Methods:
- Isothermal DNA binding assays were used to study peptide-DNA interactions.
- Counter-ion dependence and quantitative stoichiometric measurements were performed.
Main Results:
- The alpha1E2 peptide showed saturable binding to the consensus DNA sequence, indicating specific interaction.
- Non-specific DNA sequences did not saturate, confirming non-specific binding.
- Dissimilar counter-ion dependence suggested sequence-dependent binding mechanisms.
- The peptide specifically recognized the ACCG half-site.
Conclusions:
- The 18 amino-acid alpha1E2 peptide can bind DNA sequences specifically.
- This demonstrates that a short peptide motif can discriminate nucleic acid base sequences.
- Protein architecture is not essential for sequence-specific DNA recognition by this peptide.
