Chimeric Thermostable DNA Polymerases for High Fidelity PCR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for alternative thermostable DNA polymerases to improve PCR processes and other recombinant techniques such as DNA sequencing and reverse transcription, as existing thermostable polymerases like T. aquaticus DNA polymerase have limitations in terms of fidelity and processivity.
Innovation Solution
Development of recombinant DNA polymerases with specific amino acid sequences (SEQ ID NOs: 1-66) that exhibit high fidelity and processivity, including fusion proteins with purification tags for enhanced performance and ease of use, which can be used in PCR and other recombinant techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If T. aquaticus DNA polymerase is used in PCR, then the polymerase remains stable at high temperatures and does not need to be replenished after denaturation, but the fidelity and processivity are limited
Solution Approach 1:
The patent creates chimeric polymerase proteins by combining functional domains from different thermostable polymerases (T. aquaticus, T. thermophilus, P. furiosus, T. litoralis) to produce hybrid enzymes that exhibit both high thermostability and improved fidelity/processivity. This composite approach allows integration of beneficial properties from multiple sources into a single functional protein
2Stability of the object's composition
If T. aquaticus DNA polymerase is used in PCR, then the enzyme can withstand heat denaturation steps, but the processivity is limited
Solution Approach 1:
The chimeric polymerases incorporate processivity-enhancing domains from high-processivity polymerases (particularly P. furiosus and T. thermophilus) while maintaining thermostable cores from T. aquaticus, thereby achieving both heat resistance and improved processivity in the hybrid enzyme
3Ease of operation
If existing thermostable polymerases are used, then PCR amplification can be performed, but the accuracy and efficiency are suboptimal
Solution Approach 1:
By combining catalytic domains with high fidelity from T. thermophilus and T. litoralis with the thermostable framework of T. aquaticus polymerase, the chimeric enzymes achieve both operational ease in PCR and superior accuracy through optimized active site configurations
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 recombinant DNA polymerases demonstrate improved fidelity and processivity compared to existing thermostable polymerases like Vent DNA polymerase, enhancing the efficiency and accuracy of PCR and other recombinant techniques.
Implementation Method 1
a polymerase according to any one of embodiments 1-67, (ii) a DNA template; and (iii) a nucleotide solution
Data Source
AI summary
Presented herein are methods and compositions for thermostable DNA polymerases that may be used to improve the PCR process and to improve the results obtained when using a thermostable DNA polymerase in other recombinant techniques such as DNA sequencing, nick-translation, and reverse transcription.