Abstract
Immunoprecipitation (IP) is commonly used upstream of mass spectrometry (MS) as an enrichment tool for low-abundant protein targets. However, several aspects of the classical IP procedure such as nonspecific protein binding to the isolation matrix, detergents or high salt concentrations in wash and elution buffers, and antibody chain contamination in elution fractions render it incompatible with downstream mass spectrometry analysis. Here, we discuss two IP workflows that are designed to minimize or eliminate these contaminants: the first employs biotinylated antibodies and streptavidin magnetic beads while the second method utilizes a traditional antibody that is oriented and cross-linked to Protein AG magnetic beads. Both modified magnetic supports have low background binding and both antibody immobilization strategies significantly reduce or eliminate antibody heavy and light chain contamination in the eluent, minimizing potential ion suppression effects and thereby maximizing detection of target antigens and interacting proteins.
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Kaboord, B., Smith, S., Patel, B., Meier, S. (2015). Enrichment of Low-Abundant Protein Targets by Immunoprecipitation Upstream of Mass Spectrometry. In: Posch, A. (eds) Proteomic Profiling. Methods in Molecular Biology, vol 1295. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2550-6_12
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DOI: https://doi.org/10.1007/978-1-4939-2550-6_12
Publisher Name: Humana Press, New York, NY
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