Protein quantification and its tolerance for different interfering reagents using the BCA-method with regard to 2D...

Area of Science:

• Biochemistry
• Proteomics
• Analytical Chemistry

Background:

• Accurate protein quantification is crucial in laboratory settings.
• Standard protein assays like BCA can be affected by common lysis buffer components.
• Reagents such as urea and beta-mercaptoethanol interfere with protein measurement.

Purpose of the Study:

• To evaluate the compatibility of the bicinchoninic acid (BCA) assay with reagents used in 2D gel electrophoresis.
• To identify interfering effects of common lysis buffer components on BCA assay performance.
• To develop a novel method for protein quantification in lysates prepared for 2D gel electrophoresis.

Main Methods:

• Tested the tolerance of the BCA assay to various reagents (urea, beta-mercaptoethanol) at different concentrations.
• Investigated the combined effects of mixed reagents on BCA assay results.
• Developed and validated a new protein quantification method involving SDS treatment, 1D SDS-PAGE, and SYPRO Ruby fluorescence staining.

Main Results:

• The BCA assay demonstrated incompatibility with standard 2D buffer formulations.
• Interactions between different interfering reagents produced unpredictable effects on BCA assay measurements.
• The newly developed method accurately quantified protein content in lysates suitable for 2D gel electrophoresis.

Conclusions:

• Standard BCA assay is unsuitable for protein quantification in lysates intended for 2D electrophoresis due to reagent interference.
• A novel method combining SDS treatment, SDS-PAGE, and fluorescence staining provides a reliable alternative for protein quantification in complex lysates.
• This new approach ensures accurate protein measurements for downstream 2D gel electrophoresis applications.