DNA sensing by a Eu-binding peptide containing a proflavine unit.

Area of Science:

• Biochemistry
• Molecular Biology
• Analytical Chemistry

Background:

• Lanthanide-binding peptides (LBPs) are crucial tools for developing sensitive detection systems.
• Developing efficient methods for double-stranded DNA (dsDNA) detection remains a significant challenge in molecular diagnostics.

Purpose of the Study:

• To synthesize a novel lanthanide-binding peptide (LBP) capable of detecting double-stranded DNA (dsDNA).
• To incorporate a proflavine moiety into the LBP to enhance DNA binding and detection sensitivity.

Main Methods:

• Synthesis of a high-affinity LBP incorporating two unnatural chelating amino acids for lanthanide (Ln) ion coordination.
• Introduction of a proflavine moiety into the LBP structure.
• Characterization of the Eu(3+)-LBP complex's binding affinity to ct-DNA.
• Monitoring of Eu(3+)-centered luminescence upon DNA binding.

Main Results:

• The synthesized Eu(3+)-LBP complex effectively binds to ct-DNA.
• The Eu(3+)-LBP complex demonstrates sensitized europium luminescence upon binding to dsDNA.
• The intimate coupling between the LBP scaffold and the DNA intercalating unit allows for effective detection of DNA binding via luminescence.

Conclusions:

• The developed Eu(3+)-LBP-proflavine conjugate is a promising tool for sensitive and specific dsDNA detection.
• This approach leverages lanthanide luminescence for real-time monitoring of DNA interactions.
• The strategy of combining LBPs with DNA intercalators offers a versatile platform for biosensing applications.