Direct Incorporation of Functional Peptides into M-DNA through Ligand-to-Metal Charge Transfer

Area of Science:

• Biotechnology
• Molecular Biology
• Gene Therapy

Background:

• Conventional nonviral gene delivery methods often exhibit toxicity due to cationic polymers.
• A need exists for advanced gene delivery systems that overcome limitations and enable targeted delivery.

Purpose of the Study:

• To develop a novel gene delivery method by incorporating functional peptides into DNA without chemical conjugation.
• To utilize the ligand-to-metal charge transfer (LMCT) transition for peptide-DNA complex formation.

Main Methods:

• Introducing divalent metal ions (Zn2+) to DNA to form metal-bound DNA (M-DNA).
• Utilizing the LMCT transition between Zn2+ in M-DNA and sulfhydryl groups in cysteine-containing targeting peptides.
• Developing M-DNA/peptide complexes for gene transfection.

Main Results:

• Zn2+ ions spontaneously intercalate into DNA at pH 7.0-8.5, forming M-DNA.
• The LMCT transition enabled the incorporation of targeting peptides into M-DNA.
• The resulting M-DNA/peptide complexes demonstrated specific transfection of target cells.

Conclusions:

• A new, non-chemically conjugated method for gene delivery has been established.
• The M-DNA/peptide complex facilitates targeted gene delivery, overcoming limitations of conventional methods.
• This approach holds promise for advanced therapeutic applications in gene therapy.