DNA Nanocage Encapsulates Enzymes for High Yield and Stability
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Solution Overview
Problem
Current methods for creating artificial enzymatic particles face challenges such as low encapsulation yield of large proteins due to steric hindrance, insufficient substrate access, aggregation of vesicle shells, and limited control over protein arrangement within compartments, hindering broader applications in diagnostics, drug delivery, and chemical production.
Innovation Solution
A nanocage constructed from DNA with a three-dimensional body forming a honeycomb or square lattice structure, encapsulating enzymes and other biological macromolecules, which enhances their activity and protects them from proteolytic degradation by allowing controlled packaging and substrate access through nanopores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If artificial enzymatic particles are created using compartmentalization by virus-like protein particles, liposomes or polymersomes and chemical crosslinking, then encapsulation of enzymes is achieved, but low encapsulation yield of large proteins occurs due to steric hindrance
Solution Approach 1:
The patent employs a porous protein shell structure with controlled pore sizes that allows encapsulation of enzymes while maintaining accessibility. The porous architecture resolves the steric hindrance issue by providing pathways for substrate and product diffusion, enabling high encapsulation yields for large proteins without the confinement problems of traditional closed compartments.
Solution Approach 2:
The patent implements local quality control through spatially varying pore densities and sizes within the protein shell. Different regions of the shell have different permeability characteristics, allowing optimization of encapsulation yield in certain areas while maintaining substrate access in others, thereby resolving the contradiction between confinement and accessibility.
2Quantity of substance
If artificial enzymatic particles are created using compartmentalization, then encapsulation of enzymes is achieved, but insufficient access of substrates to the encapsulated enzymes occurs
Solution Approach 1:
The porous protein shell provides continuous pathways for substrate diffusion to encapsulated enzymes, eliminating the mass transfer limitations of traditional closed compartments. The pore architecture ensures sufficient substrate access while maintaining the protective encapsulation function.
Solution Approach 2:
The patent segments the protein shell into regions with different pore characteristics, creating zones that optimize both substrate access and enzyme encapsulation. This segmentation allows simultaneous achievement of high substrate accessibility and effective compartmentalization.
3Quantity of substance
If artificial enzymatic particles are created using compartmentalization, then encapsulation of enzymes is achieved, but aggregation of vesicle shells occurs
Solution Approach 1:
The porous protein shell structure prevents vesicle shell aggregation by providing internal strain relief through pore-induced flexibility. The porous architecture allows the shell to accommodate enzymatic reactions without accumulating osmotic pressure that would lead to aggregation, thereby maintaining high encapsulation efficiency while preventing shell aggregation.
4Quantity of substance
If artificial enzymatic particles are created using compartmentalization, then encapsulation of enzymes is achieved, but limited control over the spatial arrangement of proteins within the compartments occurs
Solution Approach 1:
The patent applies local quality control by creating regions within the protein shell with different pore densities and sizes. This allows precise control over the spatial arrangement of encapsulated proteins, enabling optimization of enzyme positioning for enhanced catalytic activity while maintaining a relatively simple overall compartment structure.
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
The DNA nanocage achieves high encapsulation yields and significantly enhances the activity of encapsulated enzymes, with a 3- to 10-fold increase in catalytic turnover and protection against proteolytic degradation, demonstrating improved stability and functionality.
Implementation Method 1
A nanocage constructed from DNA with a three-dimensional body forming a honeycomb or square lattice structure, encapsulating enzymes and other biological macromolecules, which enhances their activity and protects them from proteolytic degradation
Implementation Method 2
allowing controlled packaging and substrate access through nanopores
Data Source
AI summary
The present disclosure describes a nanoparticle comprising a three dimensional DNA nanocage and a payload biological macromolecule, and methods of assembly thereof.