title: The Paracoccidioides brasiliensis gp70 antigen is encoded by a putative member of the flavoproteins monooxygenase family.
abstract: Glycoprotein gp70 is an important intracellular antigen from Paracoccidioides brasiliensis that elicits both humoral and cellular immune responses. Herein, the PbGP70 gene cloning from isolate Pb18 using internal peptide sequence information is reported. The deduced protein sequence bears two N-glycosylation sites, antigenic sites and two mouse T-cell epitopes. Anti-recombinant gp70 (rPbgp70) polyclonal antibodies reacted with a 70-kDa component in total cell extract of P. brasiliensis, while MAbC5F11 and paracoccidioidomycosis patients' sera recognized rPbgp70. Confocal microscopy with anti-rPbgp70 and MAbC5F11 showed intense staining and cytoplasmatic co-localization. The protein sequence belongs to the flavoprotein monooxygenase family which groups important anti-oxidative bioactive compounds. We found increased PbGP70 transcript accumulation under oxidative stress induced by H(2)O(2), during fungal growth and in macrophage phagocyted/bound yeasts. Therefore, gp70 might play a dual role in P. brasiliensis by both eliciting immune cellular and humoral responses in the host and protecting the fungus from oxidative stress generated by phagocytic cells.
authors.affiliation: Discipline of Immunology, Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo, UNIFESP, Rua Botucatu, 862, São Paulo, SP, Brazil.
authors.forename: Juliana T
authors.initials: JT
authors.lastname: Maricato
authors.forename: Wagner L
authors.initials: WL
authors.lastname: Batista
authors.forename: Erika S
authors.initials: ES
authors.lastname: Kioshima
authors.forename: Luciano S
authors.initials: LS
authors.lastname: Feitosa
authors.forename: Ronni R Novaes
authors.initials: RR
authors.lastname: e Brito
authors.forename: Gustavo H
authors.initials: GH
authors.lastname: Goldman
authors.forename: Mário
authors.initials: M
authors.lastname: Mariano
authors.forename: Rosana
authors.initials: R
authors.lastname: Puccia
authors.forename: José D
authors.initials: JD
authors.lastname: Lopes
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015139:Blotting, Southern; D002478:Cells, Cultured; D005420:Flavoproteins / Q000378:metabolism; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal / Q000187:drug effects / Q000235:genetics; D006023:Glycoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000494:pharmacology; D008264:Macrophages / Q000382:microbiology; D051379:Mice; D008807:Mice, Inbred BALB C; D006899:Mixed Function Oxygenases / Q000235:genetics* / Q000378:metabolism*; D008969:Molecular Sequence Data; D018384:Oxidative Stress / Q000187:drug effects / Q000502:physiology; D010228:Paracoccidioides / Q000187:drug effects / Q000201:enzymology* / Q000235:genetics* / Q000254:growth & development; D017386:Sequence Homology, Amino Acid
chemical_list: D005420:Flavoproteins; D005656:Fungal Proteins; D006023:Glycoproteins; D006861:Hydrogen Peroxide; D006899:Mixed Function Oxygenases