The search for biomarkers in proteomics research continues to be a critical bottleneck in the development of new drugs as well as in the study of disease. This paper discusses the limitations of traditional protein analysis methods and proposes the use of specific interaction media for the selective removal of high-abundant proteins.
This document addresses challenges in proteomics research, specifically the dynamic range limitations caused by high-abundant proteins like albumin in complex mixtures such as human serum. It evaluates traditional methods using dye affinity chromatography resins, exemplified by Cibacron Blue (CB), which are known to bind target proteins but also exhibit broad nonspecific interactions with other serum proteins via cofactor binding sites.
The note presents an experimental comparison between the CB resin and the Agilent Multiple Affinity Removal System. The latter utilizes immunoaffinity chromatography with polyclonal antibodies to selectively remove six specific high-abundant proteins (albumin, transferrin, haptoglobin, IgG, IgA, and antitrypsin). Results from liquid chromatography tandem mass spectrometry (LC/MS/MS) demonstrate that while CB binds many nonspecific proteins, the Agilent system offers extreme specificity with minimal cross-reactivity.
| Column Dimensions (Multiple Affinity Removal) | 4.6 mm x 100-mm |
|---|---|
| Depletion Efficiency (Albumin, IgG, IgA, etc.) | greater than 98%-99% |
The bound fraction was analyzed using liquid chromatography tandem mass spectrometry (LC/MS/MS) and immunoaffinity depletion.
The column removes greater than 98%-99% of albumin from human serum samples.
A 4.6 mm x 100-mm Multiple Affinity Removal column was used for the sample loading and washing procedures.