Enzymatic Nucleic Acid Synthesis via TdT Enzyme
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Solution Overview
Problem
Current methods for de novo nucleic acid synthesis, such as phosphoramidite techniques, are limited by length constraints, produce toxic by-products, and result in significant hazardous waste, hindering the pace of genetic engineering and gene therapy advancements.
Innovation Solution
The use of nucleotidyl transferase enzymes to synthesize polynucleotides with nucleotide analogs having a cleavable linker and inhibitor, allowing for template-independent synthesis, reducing waste, and enabling longer and more cost-effective production of custom nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phosphoramidite techniques are used for de novo nucleic acid synthesis, then synthesis can be performed with established methodology, but the synthesized nucleic acids are length-limited to greater than 200 base pairs due to high rates of breakage and side reactions
Solution Approach 1:
The patent replaces the chemical phosphoramidite synthesis system with a biological system using terminal deoxynucleotidyl transferase (TdT) enzyme and engineered nucleotide analogs. This substitution of chemical methodology with enzymatic methodology enables synthesis of nucleic acids greater than 200 base pairs by eliminating the chemical instability and side reactions that limit phosphoramidite-based synthesis.
Solution Approach 2:
The patent modifies the chemical structure of nucleotides by engineering analogs with altered phosphate groups (e.g., replacing oxygen with carbon in the phosphate backbone). These parameter changes in the chemical structure enable the nucleotides to be substrates for TdT while preventing the breakage and side reactions that limit the length of phosphoramidite-synthesized nucleic acids.
2Ease of manufacture
If phosphoramidite synthesis is used, then nucleic acid synthesis can be performed, but toxic by-products are produced and significant hazardous waste is generated
Solution Approach 1:
The patent replaces the chemical phosphoramidite synthesis system with a biological system using TdT enzyme and engineered nucleotide analogs. This substitution eliminates the toxic by-products and hazardous waste associated with phosphoramidite chemistry, including acetonitrile, trichloroacetic acid, toluene, tetrahydrofuran, and pyridine, while maintaining nucleic acid synthesis capability.
Solution Approach 2:
The patent converts the potential harm of complex chemical synthesis into benefit by using a biological system that naturally performs polymerization. The TdT enzyme system converts the need for complex chemical reagents into a simpler enzymatic process that produces minimal waste, turning the limitation of biological systems into an advantage for environmental sustainability.
3Ease of manufacture
If phosphoramidite techniques are used, then synthesis can be performed, but the process is time-consuming and cost-effective methods are limited
Solution Approach 1:
The patent replaces the multi-step chemical phosphoramidite synthesis process with a streamlined enzymatic process using TdT and engineered nucleotide analogs. This substitution reduces the number of synthesis steps, eliminates the need for protective group chemistry, and enables faster, more cost-effective production of custom nucleic acids while maintaining synthesis feasibility.
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 enables faster and more efficient synthesis of longer polynucleotides with reduced waste and costs, facilitating advancements in genetic engineering and gene therapy by producing chemically equivalent natural nucleotides.
Implementation Method 1
template-independent synthesis of polynucleotides by using a nucleotidyl transferase enzyme to incorporate nucleotide analogs
Implementation Method 2
synthesize polynucleotides with nucleotide analogs having a cleavable linker and inhibitor
Implementation Method 3
the linker is cleaved, separating the inhibitor and leaving a polynucleotide that is essentially identical to a naturally occurring nucleotide
Data Source
AI summary
The invention provides improved methods for synthesizing polynucleotides, such as DNA and RNA, using enzymes and specially designed nucleotide analogs. Using the methods of the invention, specific sequences of polynucleotides can be synthesized de novo, base by base, in an aqueous environment, without the use of a nucleic acid template. Because the nucleotide analogs have an unmodified 3′ OH, i.e., as found in “natural” deoxyribose and ribose molecules, the analogs result in natural polynucleotides suitable for incorporation into biological systems.