DNA logic assembly powered by a triplex-helix molecular switch for extracellular pH imaging.

Area of Science:

• Biochemistry
• Nanotechnology
• Molecular Biology

Background:

• DNA nanostructures offer versatile platforms for molecular engineering.
• Controlling self-assembly processes with external stimuli is crucial for advanced applications.
• pH sensitivity in nucleic acid interactions can be exploited for molecular programming.

Purpose of the Study:

• To develop a novel pH-programmable strategy for DNA nanostructure self-assembly.
• To utilize the pH-dependent reverse Hoogsteen interactions for a triplex-helix molecular switch.
• To demonstrate the application of this strategy in constructing molecular logic gates and imaging extracellular pH.

Main Methods:

• Exploiting the pH-dependent stability of DNA triplexes formed via reverse Hoogsteen base pairing.
• Designing DNA sequences that undergo conformational changes in response to specific pH values.
• Integrating these pH-responsive DNA components into self-assembling nanostructures.
• Developing molecular logic gates based on the pH-triggered assembly and disassembly of DNA nanostructures.
• Utilizing the self-assembly strategy for in situ imaging of extracellular pH variations.

Main Results:

• A robust strategy for pH-programmable self-assembly of DNA nanostructures was successfully demonstrated.
• The pH-dependent reverse Hoogsteen interactions effectively functioned as a molecular switch for controlling assembly.
• Functional molecular logic gates were constructed, responding to specific pH inputs.
• The developed strategy enabled accurate imaging of extracellular pH in biological contexts.

Conclusions:

• The pH-programmable self-assembly strategy provides a powerful tool for designing responsive DNA nanostructures.
• This approach offers a novel method for creating sophisticated molecular devices like logic gates.
• The application in extracellular pH imaging highlights the potential for in vivo and diagnostic applications.