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Related Experiment Video

Updated: Jul 10, 2026

The MultiBac Protein Complex Production Platform at the EMBL

The MultiBac Protein Complex Production Platform at the EMBL

Published on: July 11, 2013

Optimization of genetic code expansion in the baculovirus expression vector system (BEVS).

Ciarán N Cronin¹

¹Structural Biology and Protein Sciences, Pfizer Global Research, Development and Medical, 10770 Science Center Drive, La Jolla, CA, USA.

Protein Expression and Purification

|June 3, 2023

Summary

This study introduces novel baculovirus transfer vectors for genetic code expansion (GCE) using the pyrrolysine tRNA/aminoacyl-tRNApyl synthetase pair. This enables the production of unnatural amino acid-containing proteins in the baculovirus expression vector system (BEVS).

Keywords:

BEVS Baculovirus expression vector system Genetic code expansion Insect cells PylRS Unnatural amino acid

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Area of Science:

Biochemistry
Molecular Biology
Protein Engineering

Background:

Genetic code expansion (GCE) enables the creation of proteins with novel properties by incorporating unnatural amino acids.
The orthogonal pyrrolysine tRNA/aminoacyl-tRNApyl synthetase (tRNApyl/PylRS) pair from Methanosarcinaceae is a key tool for GCE.
While GCE is established in E. coli and mammalian systems, its application in the baculovirus expression vector system (BEVS) is limited.

Purpose of the Study:

To develop novel baculovirus transfer vectors for GCE within the Bac-to-Bac system.
To enable the production of recombinant proteins with unnatural amino acids using BEVS.
To investigate different strategies for deploying the tRNApyl/PylRS pair in BEVS.

Main Methods:

Development of novel baculovirus transfer vectors harboring the tRNApyl/PylRS pair.
Production of recombinant proteins with unnatural amino acids using both in cis and in trans arrangements of the tRNApyl/PylRS pair.
Examination of transfer vector designs and viral infection conditions for optimal GCE in BEVS.

Main Results:

Successful development of baculovirus transfer vectors compatible with the Bac-to-Bac system for GCE.
Demonstration of recombinant protein production with unnatural amino acids in BEVS using the novel vectors.
Investigation into the efficacy of in cis vs. in trans strategies for tRNApyl/PylRS pair deployment.

Conclusions:

The developed vectors provide a new platform for GCE in BEVS, expanding protein engineering capabilities.
This work facilitates the production of novel proteins with designed functionalities using the baculovirus system.
Further optimization of vector design and infection protocols can enhance GCE efficiency in BEVS.