Codon Optimization for Cell-Free Protein Synthesis Fidelity
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Solution Overview
Problem
Current methods for producing recombinant proteins in cell-free protein synthesis systems face challenges with high error rates, particularly misincorporation of amino acids like serine, leading to proteins with altered properties and stability issues, which complicates therapeutic protein production.
Innovation Solution
The method involves using a nucleic acid template with a reduced presence of the serine codon AGC, replacing it with codons like TCA, TCG, and TCT, to minimize serine to asparagine misincorporations, thereby enhancing protein yield and fidelity in cell-free protein synthesis systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AGC codon is used frequently for encoding serine residues, then the protein synthesis process is simplified, but misincorporation of serine for asparagine increases leading to decreased translational fidelity
Solution Approach 1:
The patent changes the codon usage parameters by reducing the frequency of AGC codons from the typical majority usage (e.g., 70-80% of serine codons) to no more than 10%, and preferably no more than 5%. This parameter change in codon distribution resolves the misincorporation issue while maintaining protein synthesis efficiency
Solution Approach 2:
The patent applies different codon selection strategies to different positions in the nucleic acid sequence. Specifically, it limits AGC codons to no more than 10% at serine positions while allowing other serine codons (TCA, TCG, TCT) to be used more frequently, creating a non-uniform but optimized local codon quality distribution that reduces misincorporation events
2Productivity
If standard codon usage is maintained for serine residues, then the nucleic acid template is simpler to design, but protein yield decreases due to misincorporation and proteolysis
Solution Approach 1:
The patent modifies the codon usage parameters by implementing a specific distribution where AGC codons constitute no more than 10% (preferably no more than 5%) of all serine codons. This parameter optimization increases protein yield by reducing misincorporation and subsequent proteolysis, while the modification process remains straightforward using standard molecular biology techniques
Solution Approach 2:
The patent performs codon optimization as a preliminary step before protein synthesis. By pre-modifying the nucleic acid template to have reduced AGC codon content (≤10%), the system prevents misincorporation events before they occur during translation, thereby increasing protein yield without adding complexity to the synthesis process itself
3Reliability
If AGC codons are predominantly used for serine, then the genetic code is more efficiently utilized, but misincorporation errors increase leading to harmful protein variants
Solution Approach 1:
The patent changes the codon usage parameter by limiting AGC codons to no more than 10% of total serine codons. This parameter modification simultaneously improves protein purity by reducing misincorporation errors and increases the concentration of error-free protein by preventing the formation of misincorporated variants that would require removal during purification
Data Source
AI summary
The invention provides methods for producing a protein in a cell free protein synthesis system such that the protein does not contain an asparagine (Asn or N) residue at serine (Ser or S) positions. Also provided are compositions and nucleic acid templates for use in the methods described herein.