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. 1991 Aug;10(8):1969–1977. doi: 10.1002/j.1460-2075.1991.tb07726.x

Mannosamine, a novel inhibitor of glycosylphosphatidylinositol incorporation into proteins.

M P Lisanti 1, M C Field 1, I W Caras 1, A K Menon 1, E Rodriguez-Boulan 1
PMCID: PMC452876  PMID: 1829673

Abstract

Mannosamine (2-amino-2-deoxy D-mannose) is shown here to block the incorporation of glycosylphosphatidylinositol (GPI) into GPI-anchored proteins. The amino sugar drastically reduced the surface expression of a recombinant GPI-anchored protein in polarized MDCK cells, converted this apical membrane-bound protein to an unpolarized secretory product and blocked the expression of endogenous GPI-anchored proteins. Furthermore, it specifically inhibited the incorporation of [3H]ethanolamine (a GPI component) into mammalian and trypanosomal GPI-anchored proteins and into a well characterized GPI-lipid of Trypanosoma brucei. These results suggest that mannosamine converted an apical GPI-anchored protein to a non-polarized secretory product by depleting transfer competent GPI-precursor lipids. Our inhibitor studies provide new independent evidence for the apical targeting role of GPI in polarized epithelia and open the way towards a greater understanding of the functional role of GPI in membrane trafficking and cell regulation.

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Selected References

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