Polymer-Protein Nanoassemblies for Stimuli-Responsive Intracellular Delivery
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Solution Overview
Problem
Current methods for delivering proteins across the cellular membrane face challenges due to the structural fragility of proteins in non-native environments and impermeability to cellular membranes, with existing delivery systems often resulting in non-specific fouling and toxicity, and limited capacity for intracellular protein delivery with retained native activity.
Innovation Solution
A novel polymer-protein conjugate system utilizing PEG-methacrylate and methacrylate monomers with salicylhydroxamate and arylboronic acid modifications allows for rapid and reversible conjugation, enabling traceless release of proteins in response to specific stimuli like reactive oxygen species or pH changes, ensuring native protein function and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proteins are delivered using existing delivery systems, then protein transport across cellular membrane is achieved, but non-specific fouling and toxicity occur
Solution Approach 1:
The patent applies local quality by functionalizing specific lysine residues on the protein surface with arylboronic acid groups, creating localized reactive sites rather than modifying the entire protein surface. This selective modification at specific locations enables controlled polymer conjugation while preserving overall protein structure and reducing non-specific interactions that cause fouling and toxicity.
Solution Approach 2:
The patent utilizes parameter changes by exploiting pH-dependent chemical equilibria. The arylboronic acid groups on the protein undergo reversible conjugation with the polymer at physiological pH, but the conjugation can be reversed by changing pH conditions, enabling controlled release of the protein at the target site while minimizing non-specific binding during circulation.
2Reliability
If proteins are delivered using existing delivery systems, then protein transport is achieved, but protein native activity is lost
Solution Approach 1:
The patent applies segmentation by dividing the protein modification into discrete, controlled steps: first functionalizing specific surface lysine residues with arylboronic acid groups, then conjugating the polymer to these modified sites. This segmented approach prevents widespread denaturation and preserves the native structure and activity of the protein while enabling delivery functionality.
Solution Approach 2:
The patent uses an intermediary approach by introducing arylboronic acid functional groups as intermediate modifications on the protein surface. These intermediate groups serve as specific attachment points for polymer conjugation without directly disrupting the protein's active sites or overall fold, thus maintaining native activity while enabling controlled delivery and release.
3Reliability
If proteins are delivered across cellular membrane, then intracellular delivery is achieved, but protein impermeability to membrane is overcome with difficulty
Solution Approach 1:
The patent applies composite materials by creating a hybrid protein-polymer conjugate system. The protein component provides the therapeutic payload and biological specificity, while the polymer component enhances cellular uptake and membrane permeability. This composite approach overcomes protein impermeability to cellular membranes through the synergistic properties of the polymer-protein conjugate without requiring complex delivery devices.
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 facilitates efficient and controlled intracellular delivery of proteins with retained activity, overcoming previous limitations of protein delivery systems by providing a rapid, reversible, and non-toxic method for protein transport and release within cells.
Implementation Method 1
rapid and reversible conjugation, enabling traceless release of proteins in response to specific stimuli like reactive oxygen species or pH changes
Implementation Method 2
release of proteins in response to specific stimuli like reactive oxygen species or pH changes
Data Source
AI summary
The invention provides novel polymer-protein conjugates and molecular assemblies for controlled intracellular delivery of proteins, and compositions and methods of preparation and use thereof.