title: A monoclonal antibody directed to terminal residue of beta-galactofuranose of a glycolipid antigen isolated from Paracoccidioides brasiliensis: cross-reactivity with Leishmania major and Trypanosoma cruzi.
abstract: A mouse monoclonal antibody, MEST-1, was produced against Band 1 glycolipid antigen of Paracoccidioides brasiliensis. The glycan structure of Band 1 antigen was recently elucidated and the monosaccharides sequence was defined as: Galf beta 1-->6(Manp alpha 1-->3)Manp beta 1-->2Ins. The reactivity of MEST-1 MAb was determined by solid-phase radioimmunoassay and high performance thin layer chromatography immunostaining. Selective oxidation of galactofuranose residues and inhibition assays with different methyl-glycosides, revealed that MAb MEST-1 is directed against the terminal residue of beta-D-galactofuranose of Band 1, a phosphoglyceroglycolipid antigen of P. brasiliensis. By indirect immunofluorescence, it was observed that the epitope recognized by MEST-1 is accessible to the antibody in yeast forms of this fungus. Reactivity of MEST-1 with parasites known to express galactofuranose containing glycoconjugates was also analyzed by indirect immunofluorescence. A positive fluorescence was observed with promastigotes of Leishmania major and epimastigotes of Trypanosoma cruzi. GIPL-1 was identified as the antigen recognized by MEST-1 in Leishmania major, indicating that the MAb MEST-1 recognizes terminal galactofuranose residue in either beta 1-->6 or beta 1-->3 linkage to the mannose.
authors.affiliation: Department of Biochemistry, Universidade Federal, de São Paulo/EPM, Brazil.
authors.forename: E
authors.initials: E
authors.lastname: Suzuki
authors.forename: M S
authors.initials: MS
authors.lastname: Toledo
authors.forename: H K
authors.initials: HK
authors.lastname: Takahashi
authors.forename: A H
authors.initials: AH
authors.lastname: Straus
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000918:Antibody Specificity; D000946:Antigens, Fungal / Q000737:chemistry / Q000276:immunology*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002851:Chromatography, High Pressure Liquid; D019084:Fluorescent Antibody Technique, Indirect; D005690:Galactose / Q000737:chemistry / Q000276:immunology*; D006017:Glycolipids / Q000737:chemistry / Q000276:immunology; D018320:Leishmania major / Q000276:immunology*; D051379:Mice; D008969:Molecular Sequence Data; D010228:Paracoccidioides / Q000737:chemistry / Q000276:immunology*; D011863:Radioimmunoassay; D014349:Trypanosoma cruzi / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000946:Antigens, Fungal; D006017:Glycolipids; D005690:Galactose