DNA Condensation with a Boron-Containing Cationic Peptide for Modeling Boron Neutron Capture Therapy.

Area of Science:

• Biochemistry
• Radiation Medicine
• Molecular Biology

Background:

• 4-borono-L-phenylalanine (BPA) is a key compound in boron neutron capture therapy (BNCT).
• Understanding BPA's interaction with DNA is critical for improving BNCT efficacy.
• Peptide-DNA interactions are fundamental to cellular processes and drug delivery.

Purpose of the Study:

• To characterize the interaction of BPA incorporated into hexa-L-arginine peptides with DNA.
• To investigate the influence of ionic strength on these interactions.
• To optimize conditions for DNA condensation and boron localization for enhanced BNCT.

Main Methods:

• Experimental characterization of BPA-peptide-DNA complex formation.
• Assessment of DNA condensation under varying ionic strengths.
• Monte Carlo simulations to model energy deposition from neutron irradiation.

Main Results:

• Hexa-L-arginine peptides strongly bind and condense DNA, with this effect reduced by higher ionic strengths.
• A tetra-L-arginine ligand facilitates DNA condensate formation with minimal unbound boron.
• Simulations show >85% of energy deposition originates from boron fission under optimized conditions.

Conclusions:

• The described experimental and simulation approach provides a robust model for studying DNA damage in BNCT.
• Optimized peptide-DNA condensation enhances boron localization for efficient energy deposition.
• This work advances the understanding and modeling of high-LET particle-induced DNA damage in BNCT.