Psychrobacillus DNA Polymerase for Isothermal Nucleic Acid Amplification
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Solution Overview
Problem
Current DNA polymerases used in isothermal amplification methods have limited temperature stability and activity, particularly at low-to-moderate temperatures, which restricts their application in a broad range of temperatures, and existing PCR technologies require high-precision thermal cycling equipment and skilled personnel, making them unsuitable for point-of-care diagnostics.
Innovation Solution
A DNA polymerase from Psychrobacillus sp. with enhanced stability and activity across a broad temperature range, including low-to-moderate temperatures, which maintains substantial polymerase activity from 20°C to 35°C and shows stability even at temperatures higher than its normal marine environment, eliminating the need for thermal cycling and reducing the requirement for skilled personnel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR technology is used for nucleic acid amplification, then amplification sensitivity and specificity are improved, but the requirement for high-precision thermal cycling equipment and skilled personnel increases, making it unsuitable for point-of-care diagnostics
Solution Approach 1:
The patent replaces the mechanical thermal cycling system with a bio-chemical solution by using a DNA polymerase enzyme that performs isothermal amplification. The enzyme naturally maintains the amplification process at a constant temperature (20-35°C), eliminating the need for complex thermal cycling equipment while achieving comparable amplification sensitivity and specificity.
Solution Approach 2:
The patent changes the temperature parameter from cyclic variation (PCR) to constant isothermal conditions. By using a psychrophilic DNA polymerase that is active at low temperatures (20-35°C), the system achieves amplification without requiring temperature cycling, thereby simplifying the device complexity while maintaining amplification effectiveness.
2Ease of operation
If conventional DNA polymerases are used in isothermal amplification, then the reaction can proceed at constant temperature, but the polymerase activity and stability are limited, particularly at low-to-moderate temperatures
Solution Approach 1:
The patent optimizes the polymerase enzyme by modifying its amino acid sequence to enhance its catalytic activity and stability at low-to-moderate temperatures (20-35°C). The engineered polymerase maintains high reliability and activity across this temperature range, enabling effective isothermal amplification where conventional polymerases would be inactive or unstable.
Solution Approach 2:
The patent creates an engineered composite enzyme structure by combining domains from different polymerases (e.g., combining the polymerase domain from one source with the processivity domain from another). This composite structure achieves both high stability and high activity at low temperatures, resolving the contradiction between ease of isothermal operation and polymerase reliability.
3Measurement precision
If PCR methods are employed for diagnostic testing, then accurate detection of pathogens is achieved, but the bulky design and equipment requirements make them difficult to incorporate into point-of-care technology platforms
Solution Approach 1:
The patent replaces the mechanical thermal cycling apparatus with a biochemical isothermal amplification system using engineered DNA polymerase. This substitution eliminates bulky heating and cooling equipment, enabling compact point-of-care device design while maintaining accurate pathogen detection through isothermal amplification followed by appropriate detection methods.
Solution Approach 2:
The engineered DNA polymerase performs self-regulated isothermal amplification at constant temperature (20-35°C) without requiring external thermal control systems. The enzyme's inherent properties enable it to function optimally at these temperatures, making the system self-sufficient and eliminating the need for complex temperature control equipment in point-of-care settings.
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 Psychrobacillus sp. DNA polymerase exhibits high and stable polymerase activity across a broad temperature range, enabling efficient isothermal amplification without the need for thermal cycling, making it suitable for point-of-care diagnostics and other applications requiring robust nucleic acid amplification.
Implementation Method 1
The workhorses in PCR technology, are thermostable high fidelity DNA polymerases which together with cyclic events of heating and cooling to obtain strand separation, primer annealing and elongation, lead to amplification of a target DNA sequence
Implementation Method 2
Lately, an increased focus on non-PCR based methods, or Isothermal Amplification methods, has emerged. In these methods, nucleic acid amplification takes place at constant (moderate) temperatures
Implementation Method 3
In several of the methods, success relies on the inherent strand displacement activity of the DNA polymerase used in the reaction setup. The term strand displacement describes the ability of the polymerase to displace downstream DNA encountered during synthesis.
Data Source
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AI summary
The present invention relates to DNA polymerases. In particular, the present invention relates to DNA polymerases based on a DNA polymerase from a Psychrobacillus sp. The present invention provides an isolated DNA polymerase or an enzymatically active fragment thereof, said DNA polymerase comprising the amino acid sequence of SEQ ID NO:1 or comprising an amino acid sequence which is at least 70% identical to SEQ ID NO:1. The invention also provides nucleic acid molecules comprising a nucleotide sequence that encodes the DNA polymerase. The invention also provides a method of nucleotide polymerisation and a method of amplifying a nucleic acid in which the DNA polymerase or an enzymatically active fragment thereof is used.