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The glycosylphosphatidylinositol (GPI)-anchor modification attaches a lipid anchor to the C-terminus of a protein, tethering the protein to the cell surface membrane. From this membrane-bound state, GPI-anchored proteins (GPI-APs) can be released into the extracellular space by multiple mechanisms, including proteolytic shedding and GPI lipase activity. Since the core GPI structure is co-released with the protein by GPI lipase activity, while removed from the protein by proteolytic cleavage, affinity purification by alpha-toxin (αToxin), which binds to the core domain of the GPI-anchor, isolates GPI-containing proteins from the culture medium. The following method details a technique for affinity purification of GP-APs using His-tagged αToxin for identification of GPI-anchored proteins, analysis of the GPI-anchor status of a protein of interest, or purification for subsequent biochemical analysis. © 2022. Springer Science+Business Media, LLC, part of Springer Nature.

Citation

Kevin Huang, Sungjin Park. Affinity Purification of Glycosylphosphatidylinositol-anchored Proteins by Alpha-Toxin. Methods in molecular biology (Clifton, N.J.). 2022;2303:251-257

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PMID: 34626384

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