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Superexpression and fast purification of E coli initiation factor IF2
K K Mortensen1, N R Nyengaard, J W Hershey
1Department of Chemistry, Aarhus University, Denmark.
Biochimie
|July 1, 1991
Summary
Researchers developed an improved system for producing large quantities of E. coli initiation factor 2 (IF2). This new method yields pure, active IF2 efficiently using a novel purification technique.
Area of Science:
- Molecular Biology
- Protein Expression and Purification
Background:
- Initiation factor IF2 (infB) is crucial for bacterial protein synthesis.
- Efficient production of pure and active IF2 is essential for biochemical studies.
Purpose of the Study:
- To construct an improved overexpression system for large-scale production of E. coli initiation factor IF2.
- To develop a novel, efficient purification procedure for active IF2.
Main Methods:
- Cloned the infB gene into a thermo-inducible plasmid (pCP40) in E. coli C600.
- Induced overexpression using a lambda PL promoter and thermosensitive repressor system.
- Purified IF2 using a 3-step FPLC procedure with Q-sepharose HP, MonoQ, and MonoS chromatography.
Main Results:
- Achieved approximately 30-fold higher IF2 overexpression compared to wild-type cells.
- Obtained 5 mg of pure and active IF2 from 10 g of overproducing cells in 8 hours.
- Demonstrated the activity of purified IF2 by measuring fMet-tRNA binding to ribosomes.
Conclusions:
- The developed overexpression system and FPLC purification method provide a highly efficient means for obtaining pure, active E. coli IF2.
- The novel purification strategy avoids materials with poor flow rates, improving efficiency and capacity.