Trypanosoma cruzi surface mucins with exposed variant epitopes
The protozoan parasite Trypanosoma cruzi, the agent of Chagas disease, has a large number of mucin molecules on its surface, whose expression is regulated during the life cycle. These mucins are the main acceptors of sialic acid, a monosaccharide that is required by the parasite to infect and surviv...
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2000
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Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00219258_v275_n36_p27671_Pollevick http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00219258_v275_n36_p27671_Pollevick_oai |
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I28-R145-paper_00219258_v275_n36_p27671_Pollevick_oai2020-10-19 Pollevick, G.D. Di Noia, J.M. Salto, M.L. Lima, C. Leguizamón, M.S. De Lederkremer, R.M. Frasch, A.C.C. 2000 The protozoan parasite Trypanosoma cruzi, the agent of Chagas disease, has a large number of mucin molecules on its surface, whose expression is regulated during the life cycle. These mucins are the main acceptors of sialic acid, a monosaccharide that is required by the parasite to infect and survive in the mammalian host. A large mucin-like gene family named TcMUC containing about 500 members has been identified previously in T. cruzi. TcMUC can be divided into two subfamilies according to the presence or absence of tandem repeats in the central region of the genes. In this work, T. cruzi parasites were transfected with one tagged member of each subfamily. Only the product from the gene with repeats was highly O-glycosylated in vivo. The O-linked oligosaccharides consisted mainly of β-D-Galp(1→4)-GlcNAc and β-D-Galp(1→4)[β-D-Galp(1→6)]-D-GlcNAc. The same glycosyl moieties were found in endogenous mucins. The mature product was anchored by glycosylphosphatidylinositol to the plasma membrane and exposed to the medium. Sera from infected mice recognized the recombinant product of one repeats-containing gene thus showing that they are expressed during the infection. TcMUC genes encode a hypervariable region at the N terminus. We now show that the hypervariable region is indeed present in the exposed mature N termini of the mucins because sera from infected hosts recognized peptides having sequences from this region. The results are discussed in comparison with the mucins from the insect stages of the parasite (Di Noia, J. M., D'Orso, I., Sanchez, D. O., and Frasch, A. C. C. (2000) J. Biol. Chem. 275, 10218-10227) which do not have variable regions. Fil:Pollevick, G.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Di Noia, J.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Salto, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Leguizamón, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De Lederkremer, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_00219258_v275_n36_p27671_Pollevick info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar J. Biol. Chem. 2000;275(36):27671-27680 epitope gene product glycosylphosphatidylinositol monosaccharide mucin sialic acid amino terminal sequence animal cell article cell interaction cell membrane Chagas disease gene expression gene sequence genetic transfection mammal multigene family nonhuman polyacrylamide gel electrophoresis priority journal protein expression tandem repeat Trypanosoma cruzi vertebrate Amino Acid Sequence Animals Antigens, Protozoan Base Sequence Carbohydrate Sequence Chagas Disease Epitopes Glycosylation Glycosylphosphatidylinositols Mice Molecular Sequence Data Mucins Oligosaccharides Recombinant Proteins Transfection Trypanosoma cruzi Variation (Genetics) Animalia Insecta Mammalia Protozoa Trypanosoma Trypanosoma cruzi Vertebrata Trypanosoma cruzi surface mucins with exposed variant epitopes info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00219258_v275_n36_p27671_Pollevick_oai |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-145 |
collection |
Repositorio Digital de la Universidad de Buenos Aires (UBA) |
topic |
epitope gene product glycosylphosphatidylinositol monosaccharide mucin sialic acid amino terminal sequence animal cell article cell interaction cell membrane Chagas disease gene expression gene sequence genetic transfection mammal multigene family nonhuman polyacrylamide gel electrophoresis priority journal protein expression tandem repeat Trypanosoma cruzi vertebrate Amino Acid Sequence Animals Antigens, Protozoan Base Sequence Carbohydrate Sequence Chagas Disease Epitopes Glycosylation Glycosylphosphatidylinositols Mice Molecular Sequence Data Mucins Oligosaccharides Recombinant Proteins Transfection Trypanosoma cruzi Variation (Genetics) Animalia Insecta Mammalia Protozoa Trypanosoma Trypanosoma cruzi Vertebrata |
spellingShingle |
epitope gene product glycosylphosphatidylinositol monosaccharide mucin sialic acid amino terminal sequence animal cell article cell interaction cell membrane Chagas disease gene expression gene sequence genetic transfection mammal multigene family nonhuman polyacrylamide gel electrophoresis priority journal protein expression tandem repeat Trypanosoma cruzi vertebrate Amino Acid Sequence Animals Antigens, Protozoan Base Sequence Carbohydrate Sequence Chagas Disease Epitopes Glycosylation Glycosylphosphatidylinositols Mice Molecular Sequence Data Mucins Oligosaccharides Recombinant Proteins Transfection Trypanosoma cruzi Variation (Genetics) Animalia Insecta Mammalia Protozoa Trypanosoma Trypanosoma cruzi Vertebrata Pollevick, G.D. Di Noia, J.M. Salto, M.L. Lima, C. Leguizamón, M.S. De Lederkremer, R.M. Frasch, A.C.C. Trypanosoma cruzi surface mucins with exposed variant epitopes |
topic_facet |
epitope gene product glycosylphosphatidylinositol monosaccharide mucin sialic acid amino terminal sequence animal cell article cell interaction cell membrane Chagas disease gene expression gene sequence genetic transfection mammal multigene family nonhuman polyacrylamide gel electrophoresis priority journal protein expression tandem repeat Trypanosoma cruzi vertebrate Amino Acid Sequence Animals Antigens, Protozoan Base Sequence Carbohydrate Sequence Chagas Disease Epitopes Glycosylation Glycosylphosphatidylinositols Mice Molecular Sequence Data Mucins Oligosaccharides Recombinant Proteins Transfection Trypanosoma cruzi Variation (Genetics) Animalia Insecta Mammalia Protozoa Trypanosoma Trypanosoma cruzi Vertebrata |
description |
The protozoan parasite Trypanosoma cruzi, the agent of Chagas disease, has a large number of mucin molecules on its surface, whose expression is regulated during the life cycle. These mucins are the main acceptors of sialic acid, a monosaccharide that is required by the parasite to infect and survive in the mammalian host. A large mucin-like gene family named TcMUC containing about 500 members has been identified previously in T. cruzi. TcMUC can be divided into two subfamilies according to the presence or absence of tandem repeats in the central region of the genes. In this work, T. cruzi parasites were transfected with one tagged member of each subfamily. Only the product from the gene with repeats was highly O-glycosylated in vivo. The O-linked oligosaccharides consisted mainly of β-D-Galp(1→4)-GlcNAc and β-D-Galp(1→4)[β-D-Galp(1→6)]-D-GlcNAc. The same glycosyl moieties were found in endogenous mucins. The mature product was anchored by glycosylphosphatidylinositol to the plasma membrane and exposed to the medium. Sera from infected mice recognized the recombinant product of one repeats-containing gene thus showing that they are expressed during the infection. TcMUC genes encode a hypervariable region at the N terminus. We now show that the hypervariable region is indeed present in the exposed mature N termini of the mucins because sera from infected hosts recognized peptides having sequences from this region. The results are discussed in comparison with the mucins from the insect stages of the parasite (Di Noia, J. M., D'Orso, I., Sanchez, D. O., and Frasch, A. C. C. (2000) J. Biol. Chem. 275, 10218-10227) which do not have variable regions. |
format |
Artículo Artículo publishedVersion |
author |
Pollevick, G.D. Di Noia, J.M. Salto, M.L. Lima, C. Leguizamón, M.S. De Lederkremer, R.M. Frasch, A.C.C. |
author_facet |
Pollevick, G.D. Di Noia, J.M. Salto, M.L. Lima, C. Leguizamón, M.S. De Lederkremer, R.M. Frasch, A.C.C. |
author_sort |
Pollevick, G.D. |
title |
Trypanosoma cruzi surface mucins with exposed variant epitopes |
title_short |
Trypanosoma cruzi surface mucins with exposed variant epitopes |
title_full |
Trypanosoma cruzi surface mucins with exposed variant epitopes |
title_fullStr |
Trypanosoma cruzi surface mucins with exposed variant epitopes |
title_full_unstemmed |
Trypanosoma cruzi surface mucins with exposed variant epitopes |
title_sort |
trypanosoma cruzi surface mucins with exposed variant epitopes |
publishDate |
2000 |
url |
http://hdl.handle.net/20.500.12110/paper_00219258_v275_n36_p27671_Pollevick http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_00219258_v275_n36_p27671_Pollevick_oai |
work_keys_str_mv |
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_version_ |
1766026555190935552 |