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pubmed-article:7710065pubmed:abstractTextTriton X-114 phase partitioning has frequently been used to obtain preparations enriched in glycosylphosphatidylinositol (GPI)-anchored proteins and other hydrophobic proteins from crude cellular homogenates. We have developed a new modification of this phase-partitioning technique which allows two distinct GPI-anchored proteins of Tetrahymena mimbres to be separated from other hydrophobic as well as hydrophilic proteins and recovered in approximately 90% yield. The unique feature of the new method is a 24-h incubation of the first Triton X-114 extract at -20 degrees C. This improves the partitioning of GPI-anchored proteins into the detergent phase while promoting the aggregation of other hydrophobic proteins. Individual GPI-anchored proteins in the detergent phase are then purified to near homogeneity by one-step preparative sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis. By substituting Triton X-114/water mixtures for the conventional SDS buffer used to collect proteins eluting from the preparative gel, the purified GPI-anchored protein can be rapidly concentrated from relatively large volumes of eluate by phase partitioning at 32 degrees C. The method is also effective in separating mammalian GPI-anchored alkaline phosphatase from other proteins. It is likely to be of general utility in characterizing the GPI anchor structures associated with nonabundant and abundant GPI-anchored proteins coexisting within the same cell type.lld:pubmed
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pubmed-article:7710065pubmed:pagination166-72lld:pubmed
pubmed-article:7710065pubmed:dateRevised2006-11-15lld:pubmed
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pubmed-article:7710065pubmed:year1995lld:pubmed
pubmed-article:7710065pubmed:articleTitlePurification of glycosylphosphatidylinositol-anchored proteins by modified triton X-114 partitioning and preparative gel electrophoresis.lld:pubmed
pubmed-article:7710065pubmed:affiliationDepartment of Botany, University of Texas, Austin, 78713.lld:pubmed
pubmed-article:7710065pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:7710065pubmed:publicationTypeResearch Support, U.S. Gov't, Non-P.H.S.lld:pubmed
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