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Characterization of His-tagged, R6K-encoded pi protein variants
Ricardo Krüger1, Marcin Filutowicz
1Department of Bacteriology, University of Wisconsin, 420 Henry Mall, Madison, WI 53706, USA.
Abstract:
The pi protein of plasmid R6K is a multifunctional replication (Rep) protein, its different activities attributable, in part, to different oligomeric states: monomers and dimers. We have previously shown that His-tagged variants of the protein can exhibit alterations in dimer stability. Herein, we examined the functional properties of selected His-tagged derivatives of pi (His-pi x wt and three hyperactive replication variants) to determine if the functionality of these proteins in replication, DNA binding, and oligomerization is altered. Our results indicate that these tagged proteins retain the characteristics previously demonstrated for their non-tagged counterparts making them suitable for ongoing studies of pi protein structure and functions in replication and transcription.
Insights
His-tagged pi proteins from plasmid R6K maintain their replication, DNA binding, and oligomerization functions. These variants are suitable for further studies on pi protein structure and its roles in replication and transcription.
Area of Science:
- Molecular Biology
- Plasmid Biology
- Protein Biochemistry
Background:
- The pi protein of plasmid R6K is a multifunctional replication (Rep) protein.
- Its diverse activities are partly due to different oligomeric states, including monomers and dimers.
- Previous work indicated His-tagged pi variants can alter dimer stability.
Purpose of the Study:
- To investigate the functional properties of selected His-tagged pi derivatives.
- To determine if His-tagged pi variants affect replication, DNA binding, and oligomerization functions.
- To assess the suitability of His-tagged pi proteins for future structural and functional studies.
Main Methods:
- Characterization of His-tagged pi protein variants (His-pi x wt and three hyperactive replication variants).
- Assessment of protein functionality in replication assays.
- Evaluation of DNA binding capabilities.
- Analysis of protein oligomerization states.
Main Results:
- Selected His-tagged pi derivatives retained their characteristic functionalities compared to non-tagged counterparts.
- Replication, DNA binding, and oligomerization properties were not significantly altered by His-tagging in the tested variants.
- The functional integrity of His-tagged pi proteins was confirmed.
Conclusions:
- His-tagged pi proteins, including variants, maintain essential biological functions.
- These tagged proteins are suitable tools for in-depth investigations into pi protein structure-function relationships.
- Further studies on pi protein replication and transcription roles can proceed using these validated His-tagged variants.