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Dye-free protein molecular weight markers.
Microsugar Chang1, Hsue-Yin Hsu, Han-Jung Lee
1Institute of Biotechnology and Department of Life Science, National Dong Hwa University, Hualien 97401, Taiwan.
Electrophoresis
|July 26, 2005
Summary
Novel protein molecular weight markers using green fluorescent protein (GFP) eliminate the need for prestaining in SDS-PAGE and Western blotting. These GFP-based markers offer accurate and sensitive detection, simplifying molecular biology workflows.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Analysis
Background:
- Protein molecular weight markers are essential for SDS-PAGE and Western blotting.
- Current methods often require a prestaining procedure, adding complexity and time.
Purpose of the Study:
- To develop novel, prestain-free protein molecular weight markers.
- To utilize the stability and fluorescence of Green Fluorescent Protein (GFP) for this purpose.
Main Methods:
- Overexpression and purification of histidine-tagged GFP fusion proteins in Escherichia coli using metal affinity chromatography.
- Evaluation of marker performance in SDS-PAGE and Western blotting under visible and UV light.
Main Results:
- Developed novel, prestain-free protein molecular weight markers based on GFP.
- Minimal detection amounts were 62.5 ng (visible light) and 31.25 ng (UV light) for SDS-PAGE, and 125 ng (visible light) and 62.5 ng (UV light) for Western blotting.
- GFP markers demonstrated stability and resistance to denaturing conditions.
Conclusions:
- The developed GFP-based protein markers offer an accurate, sensitive, and user-friendly alternative to traditional markers.
- This strategy enhances the utility of GFP in molecular biology applications by simplifying gel electrophoresis and blotting procedures.