Selectively Cleavable Linkers for Polymer Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing linker cleavage methods in biotechnology, such as using strong acids or bases, result in chemical waste, are nonspecific, and can cause cross-reactions with attached molecules.
Innovation Solution
The development of selectively cleavable linkers that can be activated locally using techniques like electrochemical activation, thermal treatment, photolysis, chemical inkjet printing, or enzymatic recognition, allowing for precise control over linker cleavage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If strong acid or base solutions are used to cleave linkers, then linker cleavage is achieved, but chemical waste is created and cross-reactions with attached molecules occur
Solution Approach 1:
The patent changes the chemical parameters of the cleavage system by introducing pH-responsive elements that alter the local chemical environment. The pH-responsive elements change their protonation state based on local pH conditions, enabling selective cleavage of linkers without requiring strong acid or base solutions throughout the entire system, thus reducing chemical waste and cross-reactions.
Solution Approach 2:
The patent creates local pH variations around specific linkers using pH-responsive elements that are spatially distributed. Each linker region can have a different local pH environment, allowing selective cleavage of specific linkers while leaving others intact. This local differentiation enables precise control over which linkers are cleaved without affecting the entire system with harsh chemicals.
2Reliability
If strong acid or base solutions are used to cleave linkers, then linker cleavage is achieved, but specialized equipment is required
Solution Approach 1:
The patent replaces the mechanical/chemical delivery system required for strong acid or base solutions with a biochemical system based on pH-responsive elements and proteases. Instead of requiring specialized equipment to deliver and control harsh chemicals, the system uses naturally occurring or engineered proteins that respond to pH changes, simplifying the equipment requirements while maintaining cleavage effectiveness.
3Productivity
If nonspecific cleavage methods are used, then all linkers are cleaved, but selective release of specific molecules is not achieved
Solution Approach 1:
The patent implements local quality by creating distinct microenvironments around different linkers with different pH characteristics. pH-responsive elements are positioned to create localized pH variations, and proteases are introduced that selectively cleave linkers in specific pH environments. This spatial and chemical differentiation enables selective release of specific molecules while maintaining efficient cleavage rates.
Solution Approach 2:
The patent introduces pH-responsive elements as intermediary components between the proteases and the linkers. These intermediaries sense the local pH environment and modulate the accessibility or susceptibility of linkers to protease cleavage. This intermediary layer provides an additional level of control, enabling selective cleavage based on local pH conditions while maintaining high cleavage efficiency through enzyme-catalyzed reactions.
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 selective release of molecules attached to a solid support, fine-grained control over protecting group removal, and reduction of chemical waste and cross-reactions.
Implementation Method 1
the chemical bond between the polymer and the surface linker is cleaved by electrochemical activation
Implementation Method 2
the chemical bond between the polymer and the surface linker is cleaved by thermal treatment
Implementation Method 3
the chemical bond between the polymer and the surface linker is cleaved by exposure to light by photolysis
Implementation Method 4
the chemical bond between the polymer and the surface linker is cleaved by contact with a protease
Data Source
AI summary
Selectively controllable cleavable linkers include electrochemically-cleavable linkers, photolabile linkers, thermolabile linkers, chemically-labile linkers, and enzymatically-cleavable linkers. Selective cleavage of individual linkers may be controlled by changing local conditions. Local conditions may be changed by activating electrodes in proximity to the linkers, exposing the linkers to light, heating the linkers, or applying chemicals. Selective cleaving of enzymatically-cleavable linkers may be controlled by designing the sequences of different sets of the individual linkers to respond to different enzymes. Cleavable linkers may be used to attach polymers to a solid substrate. Selective cleavage of the linkers enables release of specific polymers from the solid substrate. Cleavable linkers may also be used to attach protecting groups to the ends of growing polymers. The protecting groups may be selectively removed by cleavage of the linkers to enable growth of specific polymers.