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The MultiBac Protein Complex Production Platform at the EMBL
Published on: July 11, 2013
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SmartBac, a new baculovirus system for large protein complex production
Yujia Zhai1,2, Danyang Zhang1,2, Leiye Yu1,2
1National Key Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
Journal of Structural Biology: X
|April 28, 2020
Summary
SmartBac is a new system for creating recombinant baculoviruses to express large protein complexes. This method efficiently produces homogenous samples for structural biology research, overcoming a key bottleneck in cryo-electron microscopy studies.
Area of Science:
- Structural Biology
- Molecular Biology
- Biochemistry
Background:
- Cryo-electron microscopy (cryo-EM) enables high-resolution structure determination of macromolecular complexes without crystallization.
- Efficient production of homogenous macromolecular complex samples is a critical bottleneck for structural studies.
Purpose of the Study:
- To develop an easy and versatile system, named SmartBac, for constructing large transfer plasmids to express large multiprotein complexes in insect cells.
- To facilitate the production of homogenous samples for structural and functional studies.
Main Methods:
- Integration of the univector plasmid-fusion system, Gibson assembly method, and polyprotein strategy for transfer plasmid construction.
- Co-expression of fluorescent proteins to monitor transfection and expression efficiencies.
- Development of a scheme for screening optimal tagged subunits for efficient purification.
Main Results:
- Successfully constructed transfer plasmids for expressing large multiprotein complexes.
- Demonstrated efficient expression and purification of six large multiprotein complexes, including the human exocyst and dynactin complexes.
- Validated the utility of co-expressed fluorescent proteins for monitoring expression.
Conclusions:
- The SmartBac system provides an efficient and versatile method for producing large multiprotein complexes for structural biology.
- This system has broad applicability and potential for future research in structural and functional characterization of complex biological assemblies.
