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- W2077078279 abstract "Glycosylphosphatidylinositol (GPI)-anchored proteins occur widely, perhaps universally, on the surface of animal cells, where they perform a variety of important functions. However, the existence of GPI-anchored proteins on plant cells has never been established. Evidence is presented in this communication for the occurrence of a 50 kDa GPI-anchored alkaline phosphatase (AP) induced in the duckweed Spirodela oligorrhiza by phosphate deprivation. Triton X-114 partitioning of the Spirodela proteins yielded two forms of AP activity. The detergent-associated form was labeled prominently by [3H]ethanolamine, [3H]myristic acid and [3H]palmitic acid. This amphiphilic form of AP, like authentic GPI-anchored AP from mammals, was clearly resolved from the remaining, water-soluble AP activity by two types of incompletely-denaturing polyacrylamide gel electrophoresis. Lipid covalently bound to the solvent-delipidated amphiphilic AP was resistant to cleavage by phosphatidylinositol-specific phospholipase C. Strong acid or alkaline hydrolysis of the 3H-fatty acid-labeled amphiphilic AP yielded radioactive fatty acids and a radioactive lipid tentatively identified as a long chain base. The more abundant water-soluble AP was also radioactive in plants incubated with [3H]ethanolamine and was labeled to a lesser extent by 3H-fatty acids. The water-soluble AP, unlike its amphiphilic counterpart, could be freed of all fatty acid radioactivity by mild alkaline hydrolysis, indicating the continued presence of an ester-linked fatty acid. All evidence supports the conclusion that Spirodela AP is synthesized as an amphiphilic protein with a ceramide-containing GPI anchor." @default.
- W2077078279 created "2016-06-24" @default.
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- W2077078279 date "1996-05-21" @default.
- W2077078279 modified "2023-10-16" @default.
- W2077078279 title "Evidence for a glycosylinositolphospholipid-anchored alkaline phosphatase in the aquatic plant Spirodela oligorrhiza" @default.
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- W2077078279 doi "https://doi.org/10.1016/0304-4165(95)00185-9" @default.
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