Detergent-Free Thermostable DNA Polymerase Purification
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Solution Overview
Problem
Thermostable DNA polymerases used in PCR are hampered by trace amounts of detergents, which are typically required for enzyme stability and purification, but can affect performance under specific conditions.
Innovation Solution
A method for producing and using thermostable DNA polymerases completely free of detergents, involving specific purification steps such as ammonium sulfate precipitation and chromatographic separations, and formulations that include buffer systems like Tris/HCl and EDTA, without the need for detergent addition at any stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If detergents are added during purification and storage, then enzyme stability is improved, but PCR performance is worsened due to trace amounts affecting amplification efficiency
Solution Approach 1:
The invention extracts and removes detergents from the polymerase formulation during purification steps. The method employs multiple chromatographic separations and ammonium sulfate precipitation to eliminate detergent contaminants while maintaining polymerase stability, resulting in a detergent-free final product that resolves the contradiction between stability and PCR performance
Solution Approach 2:
The invention changes the formulation parameters by completely eliminating detergents from the polymerase preparation. By modifying the purification protocol to exclude detergent addition and using detergent-free buffers throughout the process, the invention achieves both enzyme stability and optimal PCR performance without the harmful effects of trace detergents
2Ease of manufacture
If detergents are used in purification protocols, then polymerase purification is facilitated, but enzyme performance in real-time PCR is hampered
Solution Approach 1:
The invention extracts detergents from the purification process entirely. By removing detergent usage from the purification protocol and implementing multiple chromatographic steps with detergent-free buffers, the invention achieves both effective purification and reliable real-time PCR performance
Solution Approach 2:
The invention uses detergent-free buffer systems and alternative purification methodologies as intermediaries to achieve effective polymerase purification without detergents. The multiple chromatographic separations serve as intermediary steps that maintain purification effectiveness while avoiding detergent contamination
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 results in optimized performance for PCR, particularly in real-time PCR, with improved amplification efficiency and reduced 'hook effect' issues, as demonstrated by experiments showing effective amplification without detergent presence.
Implementation Method 1
ammonium sulfate precipitation
Implementation Method 2
chromatographic separations
Data Source
AI summary
The present invention relates to a formulation of a thermostable DNA polymerase which is completely free of detergents and its particular use in real time polymerase chain reaction (PCR). Such a formulation may be obtained if the selected purification method does not require the addition of a detergent at any purification step.