Titration-WB: A methodology for accurate quantitative protein determination overcoming reproducibility errors.

Area of Science:

• Molecular Biology
• Biochemistry
• Protein Analysis

Background:

• Western blotting (WB) is widely used for protein detection but suffers from semi-quantitative limitations.
• Housekeeping protein normalization and technical variability can compromise WB accuracy and reproducibility.

Purpose of the Study:

• To introduce titration-based Western blotting (t-WB) as a novel, accurate, and reproducible quantitative method.
• To eliminate biases associated with housekeeping protein normalization in protein quantification.

Main Methods:

• Utilizes serial dilutions of protein samples to generate regression curves for quantification.
• Employs the R² value as a quality control metric and uses the regression line's slope for protein concentration measurement.
• Normalizes protein levels to a single internal control, removing reliance on housekeeping proteins.

Main Results:

• t-WB mitigates errors like loading inaccuracies and signal saturation.
• The method demonstrates robustness across diverse experimental setups, minimizing inter-experiment variability.
• Improved accuracy in protein quantification compared to classical WB protocols.

Conclusions:

• t-WB provides a standardized and reproducible workflow for precise protein quantification.
• The technique enhances the ability to detect subtle biological changes by resolving inherent biases of classical WB.
• t-WB represents a significant advancement for quantitative protein analysis in molecular biology.