Ribosomal RNA Fragments for Template-Free Peptide Synthesis
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Solution Overview
Problem
Current methods for synthesizing peptides with non-natural amino acids are limited by the fidelity of ribosomal protein synthesis, making it challenging to produce peptides that are resistant to cellular proteases and suitable for drug delivery without degradation.
Innovation Solution
The method involves associating isolated ribosomal RNA fragments with transfer RNA fragments linked to amino acids, where the rRNA fragments catalyze peptide synthesis through peptidyl transfer independently of messenger RNA templates and proteins, using a dimerization agent like Mg2+ to promote dimerization and facilitate the linking of amino acids to tRNA fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ribosomal protein synthesis is used to synthesize peptides with non-natural amino acids, then the synthesis can proceed with high fidelity, but the resulting peptides are susceptible to cellular proteases and undergo degradation
Solution Approach 1:
The invention segments the ribosomal synthesis system by using only the essential catalytic components (rRNA fragments with peptidyl transferase activity and aminoacyl-tRNAs) while excluding the mRNA template and ribosomal proteins. This segmentation allows synthesis of peptides with non-natural amino acids without incorporating them into the cellular protein synthesis machinery, thereby preventing protease recognition and degradation while maintaining synthesis fidelity through the conserved rRNA catalytic core.
2Adaptability or versatility
If traditional ribosomal synthesis with mRNA templates is used, then peptide synthesis can be directed with specific sequences, but the process requires multiple components including proteins, mRNA, and tRNAs increasing system complexity
Solution Approach 1:
The invention extracts and removes the mRNA template and ribosomal proteins from the traditional ribosomal synthesis system, retaining only the essential rRNA catalytic fragments and aminoacyl-tRNAs. This extraction simplifies the system by eliminating unnecessary components while preserving the core peptidyl transferase activity, making the system less complex yet still capable of directed peptide synthesis through alternative means.
Solution Approach 2:
The invention creates a simplified copy of the ribosomal synthesis system that replicates only the essential catalytic function using rRNA fragments. This copy performs peptide bond formation without requiring the full ribosomal machinery or mRNA templates, thereby reducing system complexity while maintaining the ability to synthesize peptides with controlled sequences through direct aminoacyl-tRNA interactions.
3Productivity
If protein-based ribosomes are used for peptide synthesis, then catalysis can be performed with high efficiency, but the presence of proteins makes the system dependent on cellular machinery that can recognize and degrade non-natural peptides
Solution Approach 1:
The invention substitutes the protein-based mechanical system of the ribosome with an RNA-based catalytic system. By using rRNA fragments that retain peptidyl transferase activity without requiring ribosomal proteins, the system maintains catalytic efficiency while avoiding the cellular recognition mechanisms that would otherwise identify and degrade peptides containing non-natural amino acids. This substitution creates a protease-resistant synthesis system.
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 the synthesis of peptides with non-natural amino acids without the need for enzymes or chemicals other than a dimerization agent, allowing for template-free and proofreading-free synthesis of natural and non-natural peptides, suitable for drug candidates and functional peptides.
Implementation Method 1
the at least one rRNA fragment catalyzes the synthesis of the peptide through peptidyl transfer of the amino acids from the tRNA fragments
Implementation Method 2
at least one dimerization agent to promote dimerization of the at least one rRNA fragment
Implementation Method 3
associating transfer RNA fragments with amino acids in the presence of a charging agent that facilitates the linking of amino acids to the transfer RNA fragments
Data Source
AI summary
Embodiments of the present disclosure pertain to methods of synthesizing a peptide by associating at least one isolated ribosomal RNA (rRNA) fragment with a plurality of transfer RNA fragments linked to amino acids (tRNA fragments). The at least one rRNA fragment includes at least one domain that associates with the tRNA fragments. The at least one rRNA fragment catalyzes the synthesis of the peptide through peptidyl transfer of the amino acids from the tRNA fragments independently of messenger RNA (mRNA) templates. Additionally, the peptidyl transfer occurs independently of proteins. Further embodiments of the present disclosure pertain to systems for synthesizing a peptide. Such systems include the rRNA fragments of the present disclosure and optionally a plurality of tRNA fragments.