Co-Localization-Gated Multivalent DNA Logic Gate for Programmable Cell Recognition

Area of Science:

• Biotechnology
• Molecular Biology
• Nanotechnology

Background:

• Cell-surface recognition faces challenges in affinity, specificity, and off-target binding within complex biological systems.
• Existing methods struggle to achieve precise and robust molecular interactions on cell surfaces.

Purpose of the Study:

• To present a programmable molecular device integrating Boolean logic and spatial confinement for enhanced cell recognition.
• To overcome limitations of affinity, specificity, and off-target binding in cell-surface interactions.

Main Methods:

• Assembly of valence-controllable, split DNAzyme modules on a tetrahedral DNA nanostructure (TDN).
• Implementation of cell-surface AND logic gating for peroxidase-mimicking DNAzyme activity, requiring co-localization of modules on target protein clusters.
• Catalysis of biotinylation on neighboring membrane protein clusters upon activation to form stable adhesion sites.

Main Results:

• Spatial confinement and AND logic gating effectively eliminated unintended signal leakage and off-target binding.
• Trivalent DNAzyme module design promoted highly cooperative binding, leading to uniform, long-lived complexes on target cells.
• Demonstrated specific recognition and efficient isolation of target cells from mixed populations and clinical samples.

Conclusions:

• The developed programmable molecular device enables high-fidelity molecular interactions on cell surfaces.
• This strategy offers a robust method for precise cell recognition and isolation in complex biological environments.
• The system showcases potential for advanced diagnostics and therapeutics requiring specific cell targeting.