Affinity Proteomics for Fast, Sensitive, Quantitative Analysis of Proteins in Plasma

Area of Science:

• Analytical Chemistry
• Biochemistry
• Proteomics

Background:

• Increasingly complex biological samples require sensitive analytical methods.
• Immunoaffinity enrichment is crucial for quantifying low-abundance analytes in proteomics.
• Current enrichment and cleavage protocols are often time-consuming multistep processes.

Purpose of the Study:

• To develop a streamlined workflow for protein enrichment and proteolytic cleavage.
• To reduce the time required for sample preparation in analytical proteomics.
• To enable accurate quantification of low-abundance biomarkers.

Main Methods:

• A novel reactor was designed for integrated protein enrichment and proteolytic cleavage.
• The workflow was validated using Klotho, a low-abundance plasma biomarker.
• Liquid chromatography tandem mass spectrometry (LC-MS/MS) was employed for peptide analysis.

Main Results:

• The integrated workflow significantly reduces sample preparation time.
• Accurate quantification of the low-abundance biomarker Klotho was achieved.
• The entire protocol, from sample to result, can be completed in under 5 hours.

Conclusions:

• The developed single-reactor workflow offers a rapid and efficient approach for proteomic sample preparation.
• This method enhances the ability to analyze complex biological samples and identify biomarkers.
• The protocol facilitates faster biomarker validation and therapeutic efficacy studies.