Crisscross Cooperative Assembly Controls Nucleic Acid Nucleation
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Solution Overview
Problem
Existing technologies face challenges in controlling nucleation and hierarchical assembly of molecular structures, such as nucleic acid and protein nanostructures, leading to spontaneous assembly issues even at high concentrations, limiting their application in nanotechnology and biotechnology.
Innovation Solution
The crisscross cooperative assembly method uses programmable nucleic acid building blocks with cooperative binding sites to initiate assembly only when a seed structure is present, imposing a high energetic barrier against spontaneous nucleation, allowing for rapid and controlled assembly of hierarchical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional self-assembly methods are used, then assembly occurs readily, but spontaneous nucleation occurs even at high concentrations leading to uncontrolled assembly
Solution Approach 1:
The patent implements preliminary action by requiring a seed structure to be present before assembly can occur. The seed structure pre-forms the nucleation site, eliminating spontaneous nucleation. Individual building blocks are designed with cooperative binding sites that only become stable when multiple blocks simultaneously engage the seed, creating an energetic barrier that prevents assembly without the seed.
Solution Approach 2:
The patent applies parameter changes by modifying the binding energy landscape through cooperative interactions. The system transitions from simple pairwise binding to multi-body cooperative binding, where the effective binding constant increases dramatically when multiple building blocks engage the seed simultaneously. This parameter change creates a sharp threshold effect that suppresses spontaneous nucleation while enabling rapid seeded assembly.
2Speed
If high concentrations of building blocks are used to accelerate assembly, then assembly speed increases, but spontaneous nucleation is promoted
Solution Approach 1:
The seed structure serves as an intermediary that mediates between the building blocks and the assembly process. Instead of building blocks directly nucleating with each other (which causes spontaneous assembly at high concentrations), they must first bind to the seed intermediary. The seed presents multiple binding sites that coordinate the assembly of multiple blocks simultaneously, enabling high-speed assembly without spontaneous nucleation even at high block concentrations.
3Reliability
If cooperative binding sites are designed to require simultaneous engagement of multiple subunits, then spontaneous nucleation is suppressed, but assembly initiation becomes more difficult
Solution Approach 1:
The seed structure performs the preliminary action of pre-organizing multiple binding sites in the correct spatial configuration. This eliminates the need for multiple building blocks to simultaneously find each other in solution (which would be complex and slow). Instead, the seed already has the binding sites positioned correctly, so building blocks simply need to diffuse to and bind the pre-organized sites, reducing initiation complexity while maintaining suppression of spontaneous nucleation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables rapid, zero-background, and defect-free assembly of nucleic acid nanostructures, facilitating applications in nanotechnology and biotechnology, including ultrasensitive biosensors and miniaturized materials.
Implementation Method 1
Through the design of cooperative binding sites on individual biomolecular subunits that require simultaneous engagement with a large number of other subunits to achieve stable attachment
Implementation Method 2
Nucleation can only be triggered by providing a macromolecular 'seed' that resembles a pre-existing structural interface
Implementation Method 3
programmable nucleic acid hybridization interactions
Data Source
AI summary
Provided herein, in some embodiments, are methods, compositions and kits for controlling nucleation and assembly of molecular nanostructures, microstructures and macrostructures.