Surface-layer protein from Caulobacter crescentus: expression, purification and X-ray crystallographic analysis
Michael D Jones1, Anson C K Chan1, John F Nomellini1
1Department of Microbiology and Immunology, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.
Acta Crystallographica. Section F, Structural Biology Communications
|September 8, 2016
Summary
Researchers successfully expressed and purified a large surface-layer protein (RsaA) from Caulobacter crescentus. This structural analysis advances understanding of prokaryotic cell envelopes.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Surface-layer proteins form paracrystalline lattices on prokaryotic cell surfaces.
- Structural analysis of these proteins is challenging due to crystallization difficulties.
Purpose of the Study:
- To report the successful expression and purification of a truncated RsaA protein from Caulobacter crescentus.
- To enable structural analysis of a large surface-layer protein from a Gram-negative bacterium.
Main Methods:
- Utilized a Caulobacter protein-expression system for protein production.
- Employed purification and crystallization techniques.
- Performed initial X-ray diffraction analysis.
Main Results:
- Successfully expressed a truncated version of RsaA.
- Achieved purification and crystallization of the truncated RsaA.
- The expressed RsaA is the largest surface-layer protein studied to date and the first from a Gram-negative bacterium.
Conclusions:
- The study provides a foundation for the structural characterization of RsaA.
- This work overcomes previous limitations in studying large surface-layer proteins.
