ArticleACS chemical biology2011
Probing elongating and branching β-D-galactosyltransferase activities in Leishmania parasites by making use of synthetic phosphoglycans.
Article in ACS chemical biology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed, 5 citations in OpenAlex.
- Synthetic neoglycoconjugates of cell-surface phosphoglycans of Leishmania as potential anti-parasite carbohydrate vaccines.Biochemistry. Biokhimiia · 2011Review
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Authors and funding
6 authors at 1 institution in 2 countries.
Funding
Abstract
Protozoan parasites of the genus Leishmania synthesize lipophosphoglycans (LPGs), phosphoglycans and proteophosphoglycans that contain phosphosaccharide repeat units of [-6)Gal(β1-4)Man(α1-OPO(3)H-]. The repeat structures are assembled by sequential addition of Manα1-OPO(3)H and β-Gal. In this study, an UDP-Gal-dependent activity was detected in L. donovani and L. major membranes using synthetic phospho-oligosaccharide fragments of lipophosphoglycan as acceptor substrates. Incubation of a microsomal preparation from L. donovani or L. major parasites with synthetic substrates and UDP-[6-(3)H]Gal resulted in incorporation of radiolabel into these exogenous acceptors. The [(3)H]galactose-labeled products were characterized by degradation into radioactive, low molecular mass fragments upon hydrolysis with mild acid and treatment with β-galactosidases. We showed that the activity detected with L. donovani membranes is the elongating β-d-galactosyltransferase associated with LPG phosphosaccharide backbone biosynthesis (eGalT). The eGalT activity showed a requirement for the presence of at least one phosphodiester group in the substrate and it was enhanced dramatically when two or three phosphodiester groups were present. Using the same substrates we detected two types of galactosyltransferase activity in L. major membranes: the elongating β-d-galactosyltransferase and a branching β-d-galactosyltransferase (bGalT). Both L. major enzymes required a minimum of one phosphodiester group present in the substrate, but acceptors with two or three phosphodiester groups were found to be superior.
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