Cloning, characterization and expression of a calnexin homologue from the pathogenic fungus Paracoccidioides brasiliensis

We report the cloning of a Paracoccidioides brasiliensis cDNA, here named PbCnx, encoding the homologue of the endoplasmic reticulum molecular chaperone calnexin. Calnexin specifically recognizes monoglucosylated glycoproteins in the endoplasmic reticulum, thus being an essential component of the co...

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Detalles Bibliográficos
Autores: Feitosa, Luciano dos Santos [UNIFESP], Maria de Almeida Soares, Celia, Santos, Marcia Regina Machado [UNIFESP], Melo Bailao, Alexandre, Xander, Patricia [UNIFESP], Mortara, Renato Arruda [UNIFESP], Daniel Lopes, Jose [UNIFESP]
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2007
País:Brasil
Institución:Universidade Federal de São Paulo (UNIFESP)
Repositorio:Repositório Institucional da UNIFESP
Idioma:inglés
OAI Identifier:oai:repositorio.unifesp.br:11600/29469
Acceso en línea:http://dx.doi.org/10.1002/yea.1438
http://repositorio.unifesp.br/handle/11600/29469
Access Level:acceso abierto
Palabra clave:chaperone
calnexin homologue
recombinant protein
paracoccidioidomycosis
Paracoccidioidides brasiliensis
Descripción
Sumario:We report the cloning of a Paracoccidioides brasiliensis cDNA, here named PbCnx, encoding the homologue of the endoplasmic reticulum molecular chaperone calnexin. Calnexin specifically recognizes monoglucosylated glycoproteins in the endoplasmic reticulum, thus being an essential component of the complex that interacts with the folded state of nascent secreted glycoproteins. the PbCnx open reading frame was found in a 1701 base pair (bp) fragment that encodes a 567 amino acid protein with an estimated mass of 62 680 Da. Northern and Southern blot hybridizations showed that PbCnx is encoded by a single, or a low number of, gene copies. PbCnx contains the hallmark KPEDWD motifs that are found in all members of the calnexin/calreticulin family proteins. A cDNA-encoding PbCnx was overexpressed as recombinant protein in Escherichia coli. the purified recombinant PbCnx was recognized by 6 out of 10 sera from PCM patients, a result that rules out its possible consideration for further use in diagnosis. Using confocal microscopy with anti-PbCnx mouse serum against yeast forms, a cytoplasmic staining pattern was observed. Copyright (c) 2006 John Wiley & Sons, Ltd.