ZO5 DNA Polymerase Mutant Enhances RT-LAMP via Domain Swapping
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Solution Overview
Problem
Current DNA polymerases, such as Taq and Bst, lack reverse transcriptase activity and cannot efficiently perform reverse transcription at high temperatures, limiting their application in RT-PCR and RT-LAMP assays.
Innovation Solution
A ZO5 DNA polymerase mutant is developed by introducing specific mutations (E628K, I709L, E744R, A745R) and truncating the wild-type polymerase, which enhances its reverse transcriptase activity and thermal stability, allowing it to perform RT-PCR and RT-LAMP efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Taq polymerase or Bst polymerase is used, then DNA amplification is achieved, but reverse transcriptase activity is lacking
Solution Approach 1:
The patent combines the reverse transcriptase domain from ZO5 polymerase with the Bst polymerase structure through domain swapping, creating a chimeric enzyme that integrates both reverse transcription and DNA amplification functions into a single protein entity
Solution Approach 2:
The engineered Bst-ZO5 chimeric polymerase achieves multi-functionality by performing both reverse transcription of RNA to cDNA and subsequent DNA amplification, allowing a single enzyme to replace the need for separate RT and PCR enzymes
2Adaptability or versatility
If ZO5 DNA polymerase is used, then reverse transcriptase activity is achieved, but chain replacement replication is lost
Solution Approach 1:
The patent merges the reverse transcriptase catalytic domain from ZO5 with the chain displacement replication domain from Bst polymerase, creating a chimeric enzyme that inherits both functions
Solution Approach 2:
The patent applies local quality by preserving the specific catalytic residues and structural domains responsible for reverse transcription in the ZO5 portion while maintaining the Bst portion's chain displacement capability, with each domain performing its specialized function
3Adaptability or versatility
If mixed enzymes are used for RT-PCR, then both reverse transcription and PCR are achieved, but reaction conditions cannot be optimized
Solution Approach 1:
The patent merges reverse transcriptase and DNA polymerase activities into a single chimeric enzyme, eliminating the need for separate enzyme additions and enabling unified optimization of reaction conditions for both RT and PCR steps
Solution Approach 2:
The chimeric Bst-ZO5 polymerase serves as a universal enzyme for both reverse transcription and DNA amplification, allowing a single set of reaction conditions to optimize both functions rather than requiring separate optimization for mixed enzyme systems
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 mutant polymerase exhibits enhanced reverse transcriptase activity and thermal stability, enabling higher cDNA synthesis efficiency, increased detection sensitivity, and improved specificity at higher temperatures, while also being resistant to contaminants.
Implementation Method 1
The polymerase mutant is applied to PCR, RT-PCR, LAMP and RT-LMAP
Implementation Method 2
enhances its reverse transcriptase activity and thermal stability, allowing it to perform RT-PCR and RT-LAMP efficiently
Implementation Method 3
Enhanced reverse transcriptase activity together with the ability to use higher reverse transcriptase incubation temperatures, which allow relaxation of the RNA template secondary structure, and can lead to overall higher cDNA synthesis efficiency and detection sensitivity
Implementation Method 4
The polymerase mutant, after fusion of the binding peptide, also has a strong ability to resist adverse interference from contaminants, such as chocolate, peanut butter, milk, seafood, meat or egg, chocolate, pepper, blood, urine, humic acid, bile, tannin, melanin, indigo dye, plant materials, etc.
Data Source
AI summary
A ZO5 DNA polymerase mutant and its application are disclosed. The ZO5 DNA polymerase mutant is obtained by mutation of a ZO5 wild-type polymerase, which has the amino acid sequence shown as SEQ ID NO:1. Mutation sites include E628K, I709L, E744R, and A745R. The polymerase mutant can expand its capacity for a variety of activities, including reverse transcriptase, and can catalyze reverse transcription-loop mediated isothermal amplification using an RNA template. The polymerase mutant after fusion of the binding peptide has a strong ability to resist interference, such as chocolate, peanut butter, milk, seafood, meat or egg, chocolate, pepper, blood, urine, humic acid, bile, tannin, melanin, indigo dye, plant materials, etc., and can effectively shorten the LAMP required time.