Reversible Metal Ion Chelators via Conformational Switching
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Solution Overview
Problem
Current chelation technologies fail to effectively sequester metal ions under specific conditions and release them under different conditions, limiting their application in regulating enzymatic reactions and maintaining reaction efficiency.
Innovation Solution
Development of reversible chelator constructs comprising nucleic acid, peptide, or peptide nucleic acid constructs that change conformation in response to temperature and salt conditions, allowing efficient metal ion chelation under one set of conditions and preventing it under another, thereby modulating enzymatic reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chelators are used to sequester metal ions, then metal ion removal is effective, but the chelators cannot release metal ions under different conditions
Solution Approach 1:
The chelator construct incorporates a structure-forming moiety that can dynamically change its conformation in response to environmental conditions (temperature, salt concentration, pH). This dynamic structural change allows the chelation components to transition between bound and unbound states, enabling the chelator to both sequester and release metal ions as needed. The structure-forming moiety acts as a conformational switch that modulates the spatial arrangement of chelation components based on external stimuli.
Solution Approach 2:
The invention utilizes changes in physical and chemical parameters (temperature, salt concentration, pH) to trigger conformational changes in the structure-forming moiety. These parameter changes cause the chelator construct to transition between different structural states, thereby controlling the availability of chelation components for metal ion binding or release. This allows the system to respond adaptively to varying environmental conditions.
2Reliability
If chelators continuously sequester metal ions, then metal ion availability is reduced, but enzymatic reaction efficiency decreases
Solution Approach 1:
The chelator construct employs feedback mechanisms where the structural state of the chelator is influenced by environmental conditions that also affect enzymatic activity. When conditions favor structure formation, the chelator binds metal ions and reduces their availability, preventing unwanted enzymatic reactions. When conditions change (e.g., temperature increase), the structure melts and releases metal ions, restoring enzymatic activity. This feedback loop allows the system to automatically regulate metal ion availability based on reaction conditions.
Solution Approach 2:
The chelator construct enables periodic cycling between metal ion sequestration and release states through controlled changes in environmental parameters. By periodically altering conditions (such as temperature cycles in PCR), the chelator can switch between bound and unbound states, allowing metal ions to be sequestered when not needed for the reaction and released when required for enzymatic catalysis, thus optimizing reaction efficiency at different stages.
3Adaptability or versatility
If structure-forming moieties are added to chelator constructs, then condition-responsive chelation is achieved, but construct complexity increases
Solution Approach 1:
The chelator construct is designed as a composite structure combining a structure-forming moiety (nucleic acid, peptide, or peptide-nucleic acid) with chelation components. This composite design integrates the structural properties of the forming moiety with the chelating function of the attached components, creating a unified molecule that performs both structural transitions and metal ion binding. The composite nature allows the system to achieve condition-responsive behavior without requiring separate control mechanisms.
Solution Approach 2:
The invention merges the structure-forming capability with the chelation function into a single integrated construct. The structure-forming moiety and chelation components are covalently linked, so that the structural transitions of the forming moiety directly control the spatial arrangement and availability of the chelation components. This merging eliminates the need for separate structural control elements and simplifies the overall system architecture while maintaining condition-responsive functionality.
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 reversible chelator constructs efficiently manage metal ion availability, enhancing enzymatic reaction rates by sequestering metal ions when not needed and releasing them when required, thus optimizing reaction conditions and preventing unwanted degradation.
Implementation Method 1
under a first set of conditions (e.g., high temperature conditions) said one or more structural moieties adopt a first conformation that positions and/or orients said two or more chelation components such that said two or more chelation components are unable to efficiently chelate metal ions
Implementation Method 2
hybridization of the nucleic acid strands brings the chelation components into appropriate proximity and orientation to efficiently chelate metal ions
Implementation Method 3
melting of the structure separates the chelation components such that said chelation components are unable to efficiently chelate metal ions
Implementation Method 4
Chelation involves the formation or presence of two or more separate coordinate bonds between a polydentate ligand and a single central metal ion
Implementation Method 5
Chelation involves the formation or presence of two or more separate coordinate bonds between a polydentate ligand and a single central metal ion
Data Source
AI summary
Provided herein are chelator constructs (e.g., nucleic acid, peptide, peptide nucleic acid, etc.) that sequester metal ions (e.g., Mg2+) under a first set of conditions and fail to sequester or release sequestered metal ions under a second set of conditions. In particular, nucleic acid constructs are provided that sequester metal ions (e.g., Mg2+) under conditions that favor secondary and tertiary structure formation and release or fail to sequester metal ions under conditions that disfavor the formation of such structures.