ARS Ribozyme N-Terminal Polypeptide Synthesis
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Solution Overview
Problem
Current methods are unable to efficiently synthesize polypeptides with unnatural structures at the N-terminus via biosynthetic processes, limiting the production of unique peptides with desired amino acid sequences.
Innovation Solution
A process involving an ARS ribozyme that catalyzes the acylation of tRNA with any amino acid, allowing for the translationally synthesis of polypeptides with desired N-terminal structures by attaching unusual amino acids, including D-amino acids and acyl groups, to an initiator tRNA, which is then used to initiate translation in a cell-free system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional translation systems are used, then standard amino acid sequences can be synthesized, but unnatural N-terminal structures cannot be produced
Solution Approach 1:
The patent introduces an artificial aminoacyl-tRNA synthetase (aminoacyl-tRNA synthetase) as an intermediary enzyme that can attach unnatural amino acids to tRNA molecules. This artificial synthetase acts as a mediator between the genetic code and the amino acid, enabling the incorporation of non-standard amino acids at the N-terminus while maintaining translation fidelity through specific molecular recognition mechanisms.
Solution Approach 2:
The patent modifies the biochemical parameters of the translation system by introducing alternative start codons (such as GUG, UUG, or other non-AUG codons) and using modified tRNA molecules with altered anticodon sequences. These parameter changes in the genetic code parameters enable the incorporation of unnatural amino acids while maintaining functional translation capability.
2Ease of manufacture
If chemical synthesis methods are used for complex peptides, then unnatural structures can be created, but the process becomes difficult and expensive
Solution Approach 1:
The patent replaces complex chemical synthesis mechanisms with a biological translation system. Instead of using multi-step chemical reactions, protecting groups, and purification procedures, the invention uses ribosomal translation with artificial aminoacyl-tRNA synthetases to incorporate unnatural amino acids. This substitution of chemical synthesis with biosynthetic mechanisms dramatically simplifies the manufacturing process and reduces costs.
Solution Approach 2:
The patent creates a universal translation system that can produce both natural and unnatural amino acid sequences using the same ribosomal machinery. By introducing a versatile artificial aminoacyl-tRNA synthetase that recognizes multiple start codons and can attach various unnatural amino acids, the system achieves multi-functionality, eliminating the need for separate synthesis protocols for different peptide types.
3Manufacturing precision
If standard translation initiation is used, then methionine is placed at the N-terminus, but desired unnatural N-terminal structures cannot be achieved
Solution Approach 1:
The patent performs preliminary action by pre-attaching unnatural amino acids to tRNA molecules using artificial aminoacyl-tRNA synthetases before the translation process begins. This pre-aminoacylation step ensures that the correct unnatural amino acid is already in place on the tRNA, allowing the ribosome to incorporate it at the N-terminus without requiring complex in-situ modification during translation.
Solution Approach 2:
The patent inverts the conventional translation initiation approach by using non-AUG start codons and alternative initiation mechanisms. Instead of having the ribosome recognize AUG and insert methionine, the system uses other codons (such as GUG, UUG) that can be read by tRNAs carrying unnatural amino acids, thereby inverting the standard initiation sequence to achieve desired N-terminal structures.
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 convenient and inexpensive synthesis of polypeptides with unique N-terminal structures, overcoming the challenges of producing complex peptides that are difficult to chemically synthesize, and allowing for the use of unusual amino acids in biosynthetic processes.
Implementation Method 1
a ribozyme capable of catalyzing the acylation reaction of tRNA
Implementation Method 2
acylation reaction of an initiator tRNA with the amino acid substrate to give an initiator tRNA aminoacylated with the amino acid
Implementation Method 3
the ribosome translates codons one after another while moving along mRNA toward the 3′-end, and adds an amino acid to the end to be elongated of the polypeptide
Implementation Method 4
amino acids corresponding to the codons of mRNA are joined by peptide linkages one after another
Data Source
AI summary
The present invention aims to synthesize a polypeptide having an unnatural structure at the N-terminus via a biosynthetic process by translation of amino acid sequence information encoded by a nucleic acid. A polypeptide having any amino acid at the N-terminus is synthesized by using an ARS ribozyme that catalyzes the acylation of tRNA with any amino acid to attach any amino acid to an initiator tRNA, thereby initiating a translation with the initiator tRNA.