Evidences of complex formation between DABA-based nucleo-gamma-peptides with alternate configuration backbone

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Nucleic Acid Chemistry

Background:

• Peptide nucleic acids (PNAs) are DNA/RNA mimics with a peptide backbone.
• Diaminobutyric acid (DABA) offers alternative backbone configurations for PNA synthesis.
• Exploring D- and L-configurations of DABA-based PNAs (dab PNAs) is crucial for novel material development.

Purpose of the Study:

• To synthesize and characterize dab PNA hexamers with varying D- and L-diaminobutyric acid configurations.
• To investigate the self-binding capabilities of complementary dab PNA strands.
• To explore the potential of these novel polymers in biotechnological and biomedical applications.

Main Methods:

• Synthesis of four nucleo-amino acids: D- and L-diaminobutyryl adenines and thymines.
• Assembly of various hexameric dab PNA oligomers.
• Characterization using Circular Dichroism (CD) and UV spectroscopy.
• Analysis of binding interactions and stability via HPLC and Dynamic Light Scattering (DLS).

Main Results:

• Binding observed exclusively between complementary dab PNA strands with alternating D- and L-backbone configurations.
• Binding involves cooperative hydrogen bonds and base stacking.
• Self-complementary oligomers formed palindromic complexes and multimeric aggregates.
• DABA-based oligomers demonstrated high serum stability.

Conclusions:

• Alternating D/L-configuration in dab PNA backbones facilitates specific strand binding.
• Dab PNAs exhibit self-recognition properties and form complex structures.
• High serum stability and self-assembly potential position dab PNAs as promising bio-inspired polymers for nanomaterials.