Template DNA Production via 2-Step PCR Assembly
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Solution Overview
Problem
Current methods for preparing template DNA for protein synthesis in cell-free systems are time-consuming and labor-intensive, requiring complex genetic engineering techniques and multiple primer synthesis, which hinders high-throughput protein expression and purification.
Innovation Solution
A method involving 2-step PCR to amplify linear double-stranded DNA using specific primer pairs that include regulatory sequences for transcription and translation, with optimized primer concentrations and tag peptides for affinity purification, allowing for efficient production of template DNA for protein synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complex genetic engineering techniques are used to prepare template DNA, then the DNA can be prepared with appropriate regulatory sequences, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The template DNA is divided into multiple fragments that are amplified separately by PCR. Each fragment contains specific regulatory sequences or coding regions, and they are assembled together to form the complete template DNA. This segmentation allows parallel processing and eliminates the need for time-consuming cloning procedures.
Solution Approach 2:
The regulatory sequences (promoters, terminators, ribosome binding sites) are pre-designed and incorporated into the PCR primers or as separate DNA fragments before the amplification process. This preliminary preparation of regulatory elements eliminates the need for post-PCR manipulation and reduces overall preparation time.
2Measurement precision
If multiple primers are synthesized for PCR amplification, then the DNA can be amplified with high specificity, but the complexity and cost of the process increases
Solution Approach 1:
Universal primers are designed that can amplify multiple different DNA fragments by recognizing conserved regions. These universal primers replace the need for multiple specific primers, reducing primer synthesis complexity while maintaining amplification specificity through the use of fragment-specific internal primers in combination with the universal primers.
3Manufacturing precision
If traditional cloning methods are used, then DNA fragments can be inserted into vectors with regulatory sequences, but the process is difficult to automate for high-throughput production
Solution Approach 1:
The mechanical cloning process (restriction enzyme digestion, ligation, transformation) is replaced with a biochemical PCR-based assembly system. DNA fragments are amplified and assembled through PCR reactions using specifically designed primers and overlap extension techniques, which can be easily automated and scaled for high-throughput production while maintaining high assembly accuracy.
4Productivity
If strong promoter and terminator sequences are used, then transcription efficiency is improved, but the template DNA construction becomes more complex
Solution Approach 1:
Multiple functional elements (promoter sequences, terminator sequences, ribosome binding sites, and coding regions) are merged into a single continuous DNA fragment through PCR amplification. The primers are designed to include these regulatory sequences, allowing them to be incorporated during the amplification process itself, thereby simplifying the overall template construction while ensuring high transcription efficiency.
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 method enables rapid and efficient production of template DNA for protein synthesis, facilitating high-throughput protein expression and purification, and improving the efficiency of protein synthesis in cell-free systems.
Implementation Method 1
amplifying a linear double-stranded DNA by polymerase chain reaction (PCR)
Data Source
AI summary
Provided is a method of producing a template DNA used for protein synthesis comprising a step of amplifying a linear double-stranded DNA by polymerase chain reaction (PCR), by using a reaction solution comprising a first double-stranded DNA fragment comprising a sequence coding for a protein or a portion thereof, a second double-stranded DNA fragment comprising a sequence overlapping with the 5′ terminal region of the first DNA fragment, a third double-stranded DNA fragment comprising a sequence overlapping with the 3′ terminal region of the first DNA fragment, a sense primer which anneals with the 5′ terminal region of the second DNA fragment, and an anti-sense primer which anneals with the 3′ terminal region of the third DNA fragment, wherein the second DNA fragment comprises a regulatory sequence for transcription and translation of a gene, and the concentrations of the second DNA fragment and the third DNA fragment in the reaction solution each range from 5 to 2,500 pmol/L. The use of this method enables efficient production of a template DNA for expression and purification of a protein.