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Flexizymes for genetic code reprogramming.
Yuki Goto1, Takayuki Katoh, Hiroaki Suga
1Department of Chemistry, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
Nature Protocols
|June 4, 2011
Summary
Genetic code reprogramming allows the creation of novel peptides using non-proteinogenic amino acids. This method utilizes flexizymes and the flexible in vitro translation (FIT) system for efficient synthesis of custom peptide sequences.
Area of Science:
- Biochemistry
- Molecular Biology
- Synthetic Biology
Background:
- Genetic code reprogramming enables the synthesis of nonstandard peptides by reassigning codons.
- Existing methods often lack flexibility and efficiency in incorporating diverse amino acids.
Purpose of the Study:
- To present a protocol for genetic code reprogramming using flexizymes and a flexible in vitro translation (FIT) system.
- To demonstrate the efficient synthesis of nonstandard peptides with diverse structures.
Main Methods:
- Utilized flexizymes, which are flexible tRNA acylation ribozymes, for preparing nonproteinogenic acyl-tRNAs.
- Employed a custom in vitro translation apparatus (FIT system) to facilitate the reading of vacant codons by these acyl-tRNAs.
- Developed a protocol for preparing flexizymes and tRNAs, optimizing reaction conditions, and expressing nonstandard peptides.
Main Results:
- Successfully demonstrated the ribosomal expression of nonstandard peptides containing N-methyl amino acids, D-amino acids, and macrocyclic scaffolds.
- The protocol allows for the synthesis of diverse nonstandard peptides with potential biological functions.
- The entire process, from preparation to expression, can be completed by one person in approximately 1 week, with peptide synthesis achievable in 1 day.
Conclusions:
- The flexizyme-integrated FIT system provides a versatile and efficient platform for genetic code reprogramming.
- This protocol significantly expands the possibilities for synthesizing novel peptides with tailored structures and functions.
- The ease of altering peptide sequences by changing mRNA templates offers broad applications in peptide synthesis and drug discovery.
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