Enhanced tRNA array method version 2 for simultaneous in vitro synthesis of 21 tRNAs.

Area of Science:

• Synthetic Biology
• Molecular Biology
• Biochemistry

Background:

• Transfer RNAs (tRNAs) are essential for protein translation.
• Simultaneous in vitro synthesis of multiple tRNAs is a key challenge in bottom-up synthetic biology.
• Previous tRNA array methods showed reduced translational activity compared to individually synthesized tRNAs.

Purpose of the Study:

• To identify translation-limiting tRNA groups in the tRNA array method.
• To improve the translational activity of simultaneously synthesized tRNAs.
• To develop an enhanced tRNA array method for efficient in vitro synthesis.

Main Methods:

• Identification of translation-limiting tRNA groups (PIEN group).
• Sequence modification of tRNAs.
• Incorporation of a leader sequence into the tRNA array construct.
• Testing translational activity using multiple reporter proteins under various conditions.

Main Results:

• Identified specific tRNA groups limiting translation in the array method.
• Sequence modifications and leader sequence incorporation significantly improved translational activity.
• The improved tRNA array method (version 2) achieved translation levels comparable to individually prepared tRNAs.
• Effective under both translation-coupled and uncoupled conditions.

Conclusions:

• The revised tRNA array method overcomes previous limitations in simultaneous in vitro tRNA synthesis.
• This advancement provides a more efficient platform for creating self-reproducible gene expression systems.
• Enables robust protein synthesis essential for synthetic biology applications.