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  • Title: Detection of glycoproteins in the Acanthamoeba plasma membrane.
    Author: Paatero GI, Gahmberg CG.
    Journal: Exp Cell Res; 1988 Nov; 179(1):253-62. PubMed ID: 3169144.
    Abstract:
    In the present study we have shown that glycoproteins are present in the plasma membrane of Acanthamoeba castellanii by utilizing different radioactive labeling techniques. Plasma membrane proteins in the amoeba were iodinated by 125I-lactoperoxidase labeling and the solubilized radiolabeled glycoproteins were separated by lectin-Sepharose affinity chromatography followed by polyacrylamide gel electrophoresis. The periodate/NaB3H4 and galactose oxidase/NaB3H4 labeling techniques were used for labeling of surface carbohydrates in the amoeba. Several surface-labeled glycoproteins were observed in addition to a diffusely labeled region with Mr of 55,000-75,000 seen on electrophoresis, which could represent glycolipids. The presence of glycoproteins in the plasma membrane of Acanthamoeba castellanii was confirmed by metabolic labeling with [35S]methionine followed by lectin-Sepharose affinity chromatography and polyacrylamide gel electrophoresis.
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