Optimizing Immunoprecipitation Workflows for Next-gen Protein Sequencing

This application note presents a technical report on optimizing immunoprecipitation (IP) workflows for next-generation protein sequencing (NGPS) using the Platinum Pro platform. The report outlines the impact of various elution buffer compositions on the performance of NGPS, specifically focusing on the identification and characterization of proteins enriched through IP. The study evaluates the compatibility of commonly used low-pH tris/glycine and citrate/phosphate buffers, demonstrating their incompatibility with NGPS, which can lead to reduced peptide identification and alignment. The findings indicate that careful control of buffer composition, sample complexity, and enrichment specificity is crucial for achieving high-confidence sequencing results. Additionally, the report details the methodologies employed for protein extraction and sequencing, including the use of recombinant human serum albumin as a model protein. The results underscore the importance of optimizing IP conditions to enhance the robustness and reliability of sequence-level analyses in proteomics.