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Published on: February 11, 2019
Optimization of protein buffer cocktails using Thermofluor.
Linda Reinhard1, Hubert Mayerhofer, Arie Geerlof
1EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany.
Summary
Identifying optimal buffer conditions enhances protein stability and homogeneity using a novel 96-condition screen. This fluorescence-based thermal-shift assay (Thermofluor) method improves protein preparation quality and crystallization success.
Area of Science:
- Biochemistry
- Structural Biology
- Protein Science
Background:
- Protein sample stability and homogeneity are crucial for structural and functional studies.
- Buffer composition significantly impacts protein characteristics.
Purpose of the Study:
- To present a novel 96-condition screening approach for optimizing protein sample buffer compositions.
- To enhance protein stability and conformational homogeneity through buffer and additive screening.
Main Methods:
- Utilized fluorescence-based thermal-shift assay (Thermofluor) for rapid screening.
- Developed a comprehensive screen with 23 different buffers and various small-molecule additives.
- Tested salts and nucleotide analogues as potential stabilizers.
Main Results:
- Identified buffer and additive combinations that increase protein thermal stability.
- Demonstrated a method for improving protein preparation quality and yield.
- Showcased the potential for increased protein crystallization success.
Conclusions:
- The developed Thermofluor screen is an efficient tool for optimizing protein sample conditions.
- Improved protein stability and homogeneity facilitate downstream applications like crystallization.
- This approach aids in obtaining higher quality protein preparations.
