Tri-nuclear Siderophore Metal Complexes for Stable Electrochemical Labels
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Solution Overview
Problem
Existing electrochemical reporter moieties, such as ferrocene-based ones, face challenges at elevated temperatures during nucleic acid amplification and sequencing due to signal degradation and chemical instability, limiting their effectiveness in PCR and similar methods.
Innovation Solution
Tri-nuclear metal complexes, like osmium (II) complexes derived from siderophores, are synthesized for use as electrochemical labels in cleavable DNA sequencing probes, allowing for multiple labels to be introduced in a single step, reducing degradation and enhancing stability and detection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ferrocene-based electrochemical reporter moieties are used in nucleic acid amplification, then sensitivity and specificity are improved, but signal degradation occurs at elevated temperatures and chemical stability decreases
Solution Approach 1:
The patent changes the chemical parameters of the electrochemical reporter moiety by transitioning from ferrocene-based single-metal complexes to tri-nuclear metal complexes (osmium, ruthenium, or iron with three metal centers). This parameter change in molecular structure and metal composition enables the reporter to maintain chemical stability at elevated PCR temperatures while preserving electrochemical detection sensitivity and specificity.
Solution Approach 2:
The invention employs composite material structure by creating tri-nuclear metal complexes where three metal centers are coordinated within a single molecular framework derived from siderophores. This composite structure distributes thermal stress across multiple metal centers and ligand systems, preventing the signal degradation observed in single-metal ferrocene complexes while maintaining electrochemical activity.
2Quantity of substance
If sequential addition of single labels is used to label electrochemical reporter moieties, then labeling is achieved, but degradation and loss of label occurs
Solution Approach 1:
The patent merges multiple labeling functions into a single tri-nuclear metal complex molecule. Instead of sequentially adding multiple single labels that cause degradation, the invention combines three metal centers into one stable complex that can be introduced in a single step, eliminating cumulative degradation effects while maintaining high label quantity and reliability throughout the amplification process.
3Use of energy by moving object
If ferrocene-based electrochemical reporter moieties are used, then portability and low energy consumption are achieved, but solubility and chemical stability in desired oxidation states decrease
Solution Approach 1:
The patent changes the chemical parameters by replacing ferrocene-based single-metal structures with tri-nuclear metal complexes coordinated to siderophore-derived ligands. This structural parameter change enhances solubility through improved molecular polarity and interaction with aqueous buffers, while the multiple metal centers and ligand framework stabilize the complex in desired oxidation states during electrochemical detection, all while maintaining low energy consumption and portability characteristics.
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
These tri-nuclear metal complexes provide enhanced electrochemical signals, are chemically stable at elevated temperatures, and can be used in nucleic acid amplification and sequencing methods, including TaqMan-like assays, with improved sensitivity and specificity.
Implementation Method 1
electrochemical labels, and the DNA sequencing probes containing the electrochemical labels, can be utilized in nucleic acid amplification methods, including PCR methods, and in sequencing methods
Data Source
AI summary
Disclosed are tri-nuclear metal complexes and salts thereof, such as tri-nuclear osmium or ruthenium complexes or salts thereof, suitable for use as electrochemical labels. Also disclosed are oligonucleotide probes with an attached electrochemical label, methods of nucleic acid amplification, methods of sequencing, and kits for nucleic acid amplification and sequencing having oligonucleotide probes including an electrochemical label. The electrochemical labels are synthesized from siderophores.