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Abstract:

Trypanosoma cruzi, the agent of American trypanosomiasis is unable to synthesize sialic acid (SA). Instead of using the corresponding nucleotide sugar as donor of the monosaccharide, the transfer occurs from α-2,3-linked SA in the host sialoglycoconjugates to terminal β-galactopyranosyl units of the parasite mucins. For that purpose, T. cruzi expresses a glycosylphosphatidylinositol-anchored transsialidase (TcTS) that is shed into the milieu, being detected in the blood during the acute phase of the infection. The essential role of TcTS in infection and the absence of a similar activity in mammals make this enzyme an attractive target for the development of alternative chemotherapies. However, there is no effective inhibitor toward this enzyme. In vitro, 3′-sialyllactose (SL) as donor and radioactive lactose as acceptor substrate are widely used to measure TcTS activity. The radioactive sialylated product is then isolated by anion exchange chromatography and measured. Here we describe a new nonradioactive assay using SL or fetuin as donor and benzyl β-D-Fuc-(1→6)-α-D-GlcNAc (1) as acceptor. Disaccharide 1 was easily synthesized by regioselective glycosylation of benzyl α-D-GlcNAc with tetra-Obenzoyl-D-fucose followed by debenzoylation. Compound 1 lacks the hydroxyl group at C-6 of the acceptor galactose and therefore is not a substrate for galactose oxidase. Our method relies on the specific quantification of terminal galactose produced by trans-sialylation from the donor to the 6-deoxy-galactose (D-Fuc) unit of 1 by a spectrophotometric galactose oxidase assay. This method may also discriminate sialidase and trans-sialylation activities by running the assay in the absence of acceptor 1. © The Author 2010. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

Registro:

Documento: Artículo
Título:Continuous nonradioactive method for screening trypanosomal transsialidase activity and its inhibitors
Autor:Sartor, P.A.; Agusti, R.; Leguizamón, M.S.; Campetella, O.; de Lederkremer, R.M.
Filiación:Departamento de Microbiología, Facultad de Medicina, Universidad de Buenos Aires, 1121 Buenos Aires, Argentina
CIHIDECAR, Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires, Argentina
Instituto de Investigaciones Biotecnológicas, Universidad Nacional de General San Martin, 1650 San Martín, Argentina
Palabras clave:Galactose oxidase; Inhibitors; Trans-sialidase; Trypanosoma cruzi; fetuin; sialic acid; sialidase; sialidase inhibitor; anion exchange chromatography; article; carbohydrate analysis; enzyme inhibition; enzyme substrate; glycosylation; nonhuman; priority journal; spectrophotometry; Trypanosoma cruzi; alpha-Fetoproteins; Enzyme Inhibitors; Galactose; Glycoproteins; Neuraminidase; Oligosaccharides; Sialic Acids; Staining and Labeling; Structure-Activity Relationship; Trypanosoma cruzi; Mammalia; Tetra; Trypanosoma cruzi
Año:2010
Volumen:20
Número:8
Página de inicio:982
Página de fin:990
DOI: http://dx.doi.org/10.1093/glycob/cwq056
Título revista:Glycobiology
Título revista abreviado:Glycobiology
ISSN:09596658
CODEN:GLYCE
CAS:sialidase, 9001-67-6; 3'-sialyllactose; Enzyme Inhibitors; Galactose, 26566-61-0; Glycoproteins; Neuraminidase, 3.2.1.18; Oligosaccharides; Sialic Acids; alpha-Fetoproteins; trans-sialidase, 3.2.1.-
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_09596658_v20_n8_p982_Sartor.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09596658_v20_n8_p982_Sartor

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Citas:

---------- APA ----------
Sartor, P.A., Agusti, R., Leguizamón, M.S., Campetella, O. & de Lederkremer, R.M. (2010) . Continuous nonradioactive method for screening trypanosomal transsialidase activity and its inhibitors. Glycobiology, 20(8), 982-990.
http://dx.doi.org/10.1093/glycob/cwq056
---------- CHICAGO ----------
Sartor, P.A., Agusti, R., Leguizamón, M.S., Campetella, O., de Lederkremer, R.M. "Continuous nonradioactive method for screening trypanosomal transsialidase activity and its inhibitors" . Glycobiology 20, no. 8 (2010) : 982-990.
http://dx.doi.org/10.1093/glycob/cwq056
---------- MLA ----------
Sartor, P.A., Agusti, R., Leguizamón, M.S., Campetella, O., de Lederkremer, R.M. "Continuous nonradioactive method for screening trypanosomal transsialidase activity and its inhibitors" . Glycobiology, vol. 20, no. 8, 2010, pp. 982-990.
http://dx.doi.org/10.1093/glycob/cwq056
---------- VANCOUVER ----------
Sartor, P.A., Agusti, R., Leguizamón, M.S., Campetella, O., de Lederkremer, R.M. Continuous nonradioactive method for screening trypanosomal transsialidase activity and its inhibitors. Glycobiology. 2010;20(8):982-990.
http://dx.doi.org/10.1093/glycob/cwq056