A high-affinity reversible protein stain for Western blots

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Analysis

Background:

• Protein visualization on membranes is crucial for techniques like Western blotting.
• Existing protein stains often permanently fix proteins, hindering downstream analyses.
• There is a need for sensitive, reversible protein staining methods compatible with various detection systems.

Purpose of the Study:

• To introduce MemCode, a novel reversible protein stain.
• To demonstrate its utility for visualizing proteins on nitrocellulose and PVDF membranes.
• To confirm its compatibility with subsequent immunoblotting and protein analysis.

Main Methods:

• Developed MemCode, a copper-based organic complex that noncovalently interacts with proteins.
• Applied MemCode to protein blots on nitrocellulose and PVDF membranes.
• Tested reversibility using MemCode stain eraser and compatibility with Western blot detection systems.

Main Results:

• MemCode provides rapid (30s-1min) and sensitive protein staining.
• Stained bands are turquoise-blue, stable, and easily photographed.
• Stain is reversible within 2-10 minutes on different membranes.
• MemCode does not interfere with chemiluminescent, chromogenic detection, or N-terminal sequencing.

Conclusions:

• MemCode is a highly sensitive and reversible protein stain for nitrocellulose and PVDF membranes.
• It enables sequential protein analysis, including immunoblotting and sequencing.
• This technique offers advantages over existing methods for protein visualization and downstream applications.