Supramolecular DNA-based catalysis in organic solvents

Area of Science:

• Supramolecular Chemistry
• Biomolecular Engineering
• Catalysis

Background:

• DNA G-quadruplexes are versatile building blocks for DNA-based and supramolecular assemblies due to their unique folding and polymorphic nature.
• The high polarity of DNA limits G-quadruplex applications to aqueous solvents, and their structure typically requires metal-cation stabilization (e.g., potassium ions).
• A need exists to expand the utility of G-quadruplexes into nonaqueous environments for broader applications.

Purpose of the Study:

• To develop metal-free DNA G-quadruplexes capable of functioning in organic solvents.
• To engineer catalytically active G-quadruplex structures in nonaqueous media.
• To enable DNA-based catalysis in organic environments.

Main Methods:

• A noncovalent PEGylation strategy utilizing electrostatic interactions was employed to solubilize G-quadruplexes in organic solvents.
• Incorporation of an iron-containing porphyrin into the self-assembled G-quadruplex structure.
• Assessment of catalytic activity of the modified G-quadruplexes in organic solvents.

Main Results:

• The first metal-free DNA G-quadruplexes stable and functional in organic solvents were successfully created via PEGylation.
• The incorporation of iron porphyrin endowed these self-assembled G-quadruplexes with catalytic activity in organic media.
• The resulting catalytic entities were termed "supraG4zymes".

Conclusions:

• This work overcomes the solvent limitations of DNA G-quadruplexes, enabling their use in organic media.
• The development of metal-free, catalytically active G-quadruplexes ('supraG4zymes') opens new avenues for DNA-based catalysis in nonaqueous environments.
• These findings facilitate the broad utilization of DNA G-quadruplexes in diverse nonaqueous applications.