An extremely stable and orthogonal DNA base pair with a simplified three-carbon backbone

Area of Science:

• Synthetic biology
• Nucleic acid chemistry
• Biophysical chemistry

Background:

• Standard DNA relies on the 2'-deoxyribose backbone for its structure and function.
• Developing artificial nucleic acids with enhanced properties is crucial for advancing biotechnology.
• Understanding base-pairing mechanisms is fundamental to molecular biology.

Purpose of the Study:

• To investigate the pairing properties of a novel nucleotide, C3HQ, featuring a minimal three-carbon backbone.
• To evaluate the stability and orthogonality of C3HQ homopairs in the presence of Cu2+.
• To explore the potential of combining artificial backbones with novel base-pairing schemes.

Main Methods:

• Synthesis of the C3HQ nucleotide.
• Spectroscopic analysis to determine pairing strength.
• Biophysical assays to assess orthogonality and stability.
• Comparison with standard DNA base pairs.

Main Results:

• The C3HQ nucleotide with a three-carbon backbone demonstrated unprecedented pairing strength.
• C3HQ:C3HQ homopairs exhibited remarkable stability, enhanced by Cu2+.
• The pairing stability of C3HQ in DNA surpassed that of standard base pairs with 2'-deoxyribose backbones.
• Orthogonality of the C3HQ pairing was confirmed.

Conclusions:

• A synergistic effect exists between the artificial C3HQ backbone and its base-pairing scheme.
• This discovery enables the economical design of modified oligonucleotides with tunable properties.
• Opens new avenues for creating novel DNA-based nanomaterials and therapeutics.