Modified Polymerase Shielding for Photostability
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Solution Overview
Problem
Current polymerases face challenges with photostability, nanoparticle tolerance, and kinetic behavior, particularly in assays involving labels, leading to reduced activity and inefficient nucleotide incorporation.
Innovation Solution
Development of modified DNA polymerases with enhanced photostability, nanoparticle tolerance, and improved primer extension activity, including specific amino acid mutations that increase branching ratios and tolerance for labeled nucleotides, allowing for more efficient nucleic acid synthesis and real-time sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional labels (e.g., nanoparticles, organic dyes) are used in polymerase-based assays, then superior quantum yield, size tunability, brightness, and resistance to photobleaching are achieved, but polymerase activity is inhibited
Solution Approach 1:
The patent introduces a localized protective structure (shielding group) at a specific position on the label that selectively blocks interaction with the polymerase active site while leaving the detection properties intact. This resolves the contradiction by making only the critical interaction region protected, rather than modifying the entire label system.
Solution Approach 2:
The shielding group acts as an intermediary element between the label and the polymerase. It physically intercepts and blocks harmful interactions (such as nanoparticle surface effects or dye quenching) from reaching the polymerase active site, thereby protecting enzyme activity while allowing the label to maintain its detection function.
2Productivity
If polymerase is exposed to excitation radiation for label detection, then real-time monitoring is enabled, but polymerase activity is reduced
Solution Approach 1:
The shielding group is pre-positioned on the label to prevent photodamage to the polymerase before it occurs. During excitation radiation exposure, the shielding group absorbs or blocks the harmful radiation effects, preventing polymerase inactivation while allowing the label to be excited and detected.
3Manufacturing precision
If polymerase exhibits high fidelity and specificity, then accurate nucleotide incorporation is achieved, but residence time for detection is reduced
Solution Approach 1:
The patent creates a dynamic balance in the polymerase-nucleotide-label interaction. The shielding group modulates the binding kinetics to achieve optimal residence time that is sufficient for detection while maintaining the fidelity of nucleotide selection. This allows the system to adapt between accuracy and detection duration requirements.
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 modified polymerases exhibit significantly higher photostability and nanoparticle tolerance, along with increased primer extension activity, enabling more efficient nucleic acid synthesis and improved real-time sequencing capabilities.
Implementation Method 1
The polymerases typically catalyze nucleic acid synthesis against an existing polynucleotide template
Implementation Method 2
detecting signals emitted by labels associated with one or more components of the polymerase reaction
Implementation Method 3
nanoparticles can exhibit superior quantum yield, size tunability, brightness and resistance to photobleaching
Data Source
AI summary
Disclosed herein are modified polymerase compositions exhibiting altered polymerase activity, which can be useful in a variety of biological applications. Also disclosed herein are methods of making and using such compositions. In some embodiments, the compositions exhibit altered properties that can enhance their utility in a variety of biological applications. Such altered properties, can include, for example, altered nucleotide binding affinities, altered nucleotide incorporation kinetics, altered photostability and/or altered nanoparticle tolerance, as well as a range of other properties as disclosed herein.