Ribozyme Catalyst for Universal tRNA Acylation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for incorporating nonnatural amino acids into proteins are limited due to the strict substrate recognition of natural aminoacyl-tRNA synthetases, making it difficult and expensive to synthesize tRNAs aminoacylated with nonnatural amino acids, and existing approaches are impractical for a wide range of nonnatural amino acids.
Innovation Solution
Development of ribozymes capable of catalyzing tRNA acylation with various amino acids, including nonnatural ones, using RNA sequences that recognize the 3'-terminal consensus sequence of tRNAs, allowing for the attachment of natural, nonnatural amino acids, and lactic acid to tRNAs, facilitating site-specific unnatural amino acid mutagenesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural aminoacyl-tRNA synthetases are used for tRNA aminoacylation, then high substrate specificity is achieved, but the ability to accept nonnatural amino acids is lost
Solution Approach 1:
The patent introduces an artificial ribozyme as an intermediary catalyst that mediates between tRNA and amino acid substrates. This ribozyme contains a specially designed active site that can accommodate both natural and nonnatural amino acids while maintaining tRNA recognition capability, thus serving as a mediator that bridges the gap between strict specificity and broad versatility
Solution Approach 2:
The invention changes the catalytic parameters by replacing protein-based aminoacyl-tRNA synthetases with RNA-based ribozymes. This fundamental parameter change in catalyst composition allows the system to achieve both high specificity for tRNA recognition and broad acceptance of various amino acid substrates including nonnatural ones, resolving the contradiction between reliability and adaptability
2Adaptability or versatility
If chemical aminoacylation methods are used to attach nonnatural amino acids to tRNAs, then nonnatural amino acid incorporation is achieved, but the process becomes expensive and complex
Solution Approach 1:
The artificial ribozyme catalyzes the aminoacylation reaction autonomously without requiring complex chemical activation reagents or multi-step synthesis procedures. The ribozyme's active site naturally facilitates the attachment of amino acids to tRNA through catalysis, making the system self-sufficient and eliminating the need for expensive chemical aminoacylation protocols
Solution Approach 2:
The patent replaces complex chemical mechanical systems (chemical activation, multiple synthesis steps) with a biological catalytic system (ribozyme). This substitution simplifies the overall process by using enzymatic catalysis instead of chemical reactions, reducing both complexity and cost while maintaining the ability to incorporate nonnatural amino acids
3Reliability
If multiple different catalysts are used for different amino acids, then substrate specificity is maintained, but the number of catalysts required increases
Solution Approach 1:
The artificial ribozyme is designed with a universal active site that can recognize and catalyze aminoacylation for multiple different amino acid substrates including all natural amino acids and various nonnatural amino acids. This single multi-functional ribozyme replaces the need for twenty different protein ARSs, maintaining substrate recognition accuracy while dramatically reducing the quantity of catalysts required
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
Enables the inexpensive, convenient, and rapid attachment of all types of amino acids to tRNAs, including artificial ones, with a single ribozyme molecule being compatible with various tRNAs and amino acids, simplifying the synthesis of substrates and acylation reactions.
Implementation Method 1
ribozymes capable of catalyzing tRNA acylation with various amino acids
Implementation Method 2
attachment of natural, nonnatural amino acids, and lactic acid to tRNAs
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An object of the present invention is to provide novel ribozyme systems capable of catalyzing tRNA acylation using various carboxylic acids as acyl donors and uses thereof. Disclosed is a ribozyme catalyzing tRNA acylation having a structure consisting of the RNA sequence represented by (formula 1): (formula 1) P1-Z1Z2Z3Z4(N1)1(N1)2...(N1)p-P2-(N2)1(N2)2...(N2)qY1Y2Y3(N3)1(N3)2N4GGN wherein (N1)1-(N1)p each independently represent any monoribonucleotide of U, C, A and G; p represents 3 or 4; (N2)1-(N2)q each independently represent any monoribonucleotide of U, C, A and G; q represents 5 or 6; (N3)1-(N3)2 each independently represent any monoribonucleotide of U, C, A and G; N4 represents any monoribonucleotide of U, C, A and G; Z1-Z4 each independently represent C or G; Y1-Y3 each independently represent C or G; N represents a monoribonucleotide complementary to A or G; and P1 and P2 represent a domain consisting of any RNA sequence capable of having a stem-loop structure.