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• W2045372511 endingPage "160" @default.
• W2045372511 startingPage "153" @default.
• W2045372511 abstract "Intestinal alk-SMase (alkaline sphingomyelinase) is an ectoenzyme related to the NPP (nucleotide phosphodiesterase) family. It has five potential N-glycosylation sites and predicated transmembrane domains at both the N- and C-termini. The amino acid residues forming the two metal-binding sites in NPP are conserved, and those of the active core are modified. We examined the functional changes of the enzyme induced by deglycosylation and mutagenesis. Treating alk-SMase cDNA-transfected COS-7 cells with tunicamycin rendered the expressed enzyme completely inactive. Mutations of the five potential N-glycosylation sites individually and in combination showed that these sites were all glycosylated and deficient glycosylation decreased the enzyme activity. Immunogold labelling showed that the wild-type enzyme was mainly located in the plasma membrane, whereas the C-terminal domain-truncated enzyme was released into the medium. Deglycosylation blocked the release of the enzyme that accumulated in endosome-like structures. The enzyme activity was also decreased by mutations of the residues forming the putative metal-binding sites and the active core. Substitution of the active core sequence with that of NPP or mutation of T75 in the core abolished the enzyme activity against sphingomyelin but failed to render the enzyme NPP active. Our results indicate that alk-SMase activity is severely affected by defective N-glycosylation and structural alterations of the putative metal-binding sites and the predicted active core." @default.
• W2045372511 created "2016-06-24" @default.
• W2045372511 creator A5008019188 @default.
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• W2045372511 creator A5027562999 @default.
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• W2045372511 date "2005-02-08" @default.
• W2045372511 modified "2023-10-16" @default.
• W2045372511 title "Functional studies of human intestinal alkaline sphingomyelinase by deglycosylation and mutagenesis" @default.
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• W2045372511 doi "https://doi.org/10.1042/bj20041455" @default.
• W2045372511 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1134777" @default.
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• W2045372511 hasPublicationYear "2005" @default.
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