Characterization of a gene which encodes a mannosyltransferase homolog of Paracoccidioides brasiliensis.
We screened an expression library of the yeast form of Paracoccidioides brasiliensis with a pool of human sera that was pre-adsorbed with mycelium, from patients with paracoccidioidomycosis (PCM). A sequence (PbYmnt) was obtained and characterized. A genomic clone was obtained by PCR of P. brasiliensis total DNA. The sequence contained a single open reading frame (ORF) encoding a protein of 357 amino acid residues, with a molecular mass of 39.78 kDa. The deduced amino acid sequence exhibited identity to mannosyl- and glycosyltransferases from several sources. A DXD motif was present in the translated gene and this sequence is characteristic of the glycosyltransferases. Hydropathy analysis revealed a single transmembrane region near the amino terminus of the molecule that suggested a type II membrane protein. The PbYmnt was expressed preferentially in the yeast parasitic phase. The accession number of the nucleotide sequence of PbYmnt and its flanking regions is AF374353. A recombinant protein was generated in Escherichia coli. Our data suggest that PbYmnt encodes one member of a glycosyltransferase family of proteins and that our strategy was useful in the isolation of differentially expressed genes.
Laboratório de Biologia Molecular, Instituto de Ciências Biológicas, Universidade Federal de Goiás, 74001-970, Goiânia, Goiás, Brazil.
Alessandra A
AA
Costa
Francisco J
FJ
Gómez
Maristela
M
Pereira
M Sueli S
MS
Felipe
Rosália S A
RS
Jesuino
George S
GS
Deepe
Célia M
CM
de Almeida Soares
D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000276:immunology / Q000302:isolation & purification; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008364:Mannosyltransferases / Q000737:chemistry / Q000235:genetics* / Q000276:immunology / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010228:Paracoccidioides / Q000201:enzymology* / Q000235:genetics* / Q000276:immunology; D010229:Paracoccidioidomycosis / Q000276:immunology; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
D005656:Fungal Proteins; D011994:Recombinant Proteins; D008364:Mannosyltransferases