Related Experiment Videos
A simple in vivo assay for increased protein solubility
K L Maxwell1, A K Mittermaier, J D Forman-Kay
1Department of Molecular and Medical Genetics, University of Toronto, Ontario, Canada.
Protein Science : a Publication of the Protein Society
|September 24, 1999
Summary
Researchers developed a novel method to easily identify soluble protein mutants in vivo. This technique uses chloramphenicol acetyltransferase (CAT) fusions to select for increased protein solubility, aiding protein characterization.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- Low protein solubility hinders structural and functional studies.
- Mutagenesis can enhance protein solubility, but identifying target residues is challenging without structural data.
Purpose of the Study:
- To develop an in vivo method for distinguishing soluble protein mutants from insoluble ones in Escherichia coli.
- To facilitate the selection of soluble protein variants for further characterization.
Main Methods:
- Fusing proteins of interest to chloramphenicol acetyltransferase (CAT).
- Observing that insoluble protein-CAT fusions decrease bacterial resistance to chloramphenicol.
- Selecting soluble mutants by plating on high concentrations of chloramphenicol.
Main Results:
- A correlation was established between protein solubility and chloramphenicol resistance in CAT-fused cells.
- A method was successfully developed to select for soluble protein mutants in vivo.
- This approach simplifies the identification of soluble protein variants.
Conclusions:
- The developed method provides an efficient way to screen for and select soluble protein mutants.
- This technique is valuable for protein engineering and structural biology, especially when structural information is lacking.
- The CAT fusion system offers a practical solution for overcoming protein insolubility challenges.