Cell-Free Peptide Synthesis with Protected Aminoacyl-tRNAs
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Solution Overview
Problem
Existing methods for synthesizing peptides using cell-free translation systems are inefficient in incorporating structurally-diverse natural amino acids and amino acid analogs, leading to low translation efficiency and peptide yield due to hydrolysis of unprotected aminoacyl-tRNAs during preparation and within the translation system.
Innovation Solution
The method involves linking nitrogen-atom-protected amino acids or amino acid analogs to aminoacyl-tRNAs and performing deprotection and peptide translation in parallel within the cell-free translation system, using enzymes, reducing agents, or photoreactions to enhance stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If unprotected aminoacyl-tRNAs are prepared and added to the translation system, then structurally-diverse amino acids can be incorporated, but hydrolysis occurs during preparation and within the system leading to low translation efficiency and peptide yield
Solution Approach 1:
The patent applies preliminary action by pre-attaching protecting groups to amino acids before they are incorporated into aminoacyl-tRNAs. This protective measure is taken in advance to prevent hydrolysis that would otherwise occur during the preparation and translation processes, thereby maintaining the integrity of structurally-diverse amino acids while ensuring reliable translation efficiency.
2Adaptability or versatility
If unprotected aminoacyl-tRNAs are used, then amino acid diversity is achieved, but hydrolysis of aminoacyl-tRNAs occurs leading to reduced peptide yield
Solution Approach 1:
The patent uses protecting groups as intermediary substances that temporarily mask the amino acid functionality during translation. These protecting groups act as mediators that prevent direct exposure to hydrolytic conditions, allowing the amino acid diversity to be maintained while preventing substance loss through hydrolysis. The protecting groups are subsequently removed after translation to reveal the desired diverse amino acid sequence.
3Productivity
If conventional aminoacyl-tRNA preparation methods are used, then translation can proceed, but hydrolysis occurs during preparation and within the translation system
Solution Approach 1:
The patent applies preliminary anti-action by introducing protecting groups onto amino acids before they are incorporated into aminoacyl-tRNAs. This preemptive protective measure counteracts the harmful hydrolysis that would otherwise occur during preparation and translation. The protecting groups stand ready to prevent hydrolytic degradation, thereby maintaining high translation efficiency while eliminating the harmful effect of aminoacyl-tRNA hydrolysis.
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 improves translation efficiency and peptide yield by minimizing hydrolysis, allowing for the synthesis of structurally-diverse peptides with enhanced stability and efficiency compared to conventional methods.
Implementation Method 1
The deprotecting and translation steps are performed in parallel in the cell-free translation system
Implementation Method 2
using enzymes, reducing agents, or photoreactions to enhance stability and efficiency
Implementation Method 3
using enzymes, reducing agents, or photoreactions to enhance stability and efficiency
Data Source
AI summary
An objective of the present invention is to provide methods of synthesizing peptides containing structurally diverse amino acids using cell-free translation systems, which can accomplish excellent translational efficiency as compared to conventional techniques (the conventional techniques being methods which involve preparing aminoacyl-tRNAs which do not have protecting groups outside the translation systems without using ARS, and then adding the prepared aminoacyl-tRNAs into translation systems). In the present invention, it was found that amino acid-containing peptides can be synthesized efficiently by protecting an amino acid linked to tRNA with an appropriate protecting group, and then performing the step of deprotecting the protecting group of the amino acid linked to tRNA and the step of peptide translation from a template nucleic acid in a cell-free translation system in parallel.