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• W1506033718 abstract "Lactase-phlorizin hydrolase (LPH) (EC 3.2.1.23/62) is a major intestinal microvillar membrane glycoprotein that digests lactose, the main carbohydrate of milk. To investigate structure/function relationships of LPH and to assess the impact of intracellular processing on the function of LPH and on its transport to the cell surface, we have expressed a full-length cDNA encoding LPH in mammalian COS-1 cells. Analysis of the expressed protein by immunoprecipitation with monoclonal anti-LPH antibodies and treatments with endo-beta-N-acetylglucosaminidase H and sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed two polypeptides with apparent molecular masses of 215 and 230 kDa, representing the mannose-rich (pro-LPHh) and complex (pro-LPHc) glycosylated forms of the precursor. By contrast to pro-LPH in human enterocytes, the expressed pro-LPH in COS-1 cells does not undergo intracellular proteolytic cleavage to generate a form similar to the mature enzyme of the brush-border membrane. Intracellular cleavage, however, is not essential for the molecule to acquire its enzymatic activity since pro-LPH in COS-1 cells is enzymatically as active as LPH isolated from intestinal brush-border membranes. Indirect immunofluorescent staining of transfected cells demonstrated that pro-LPH is expressed at the cell surface. This was further corroborated by the sensitivity of the complex glycosylated form (pro-LPHc) to trypsin in the medium. Our results provide the first conclusive evidence that pro-LPH is an enzymatically active molecule and that the intracellular proteolysis of pro-LPH is not essential for the generation of transport-competent forms of LPH." @default.
• W1506033718 created "2016-06-24" @default.
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• W1506033718 date "1991-07-01" @default.
• W1506033718 modified "2023-10-16" @default.
• W1506033718 title "Expression of a full-length cDNA coding for human intestinal lactase-phlorizin hydrolase reveals an uncleaved, enzymatically active, and transport-competent protein" @default.
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• W1506033718 doi "https://doi.org/10.1016/s0021-9258(18)98898-8" @default.
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