Utilização de Kluyveromyces lactis na expressão da GDPase de Leishmania major.

• Ano de defesa: 2009
• Autor(a) principal: Santos, Yaro Luciolo dos
• Orientador(a): Passos, Flávia Maria Lopes
• Banca de defesa: Fietto, Luciano Gomes , Paula, Sérgio Oliveira de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Microbiologia Agrícola
• Departamento: Associações micorrízicas; Bactérias láticas e probióticos; Biologia molecular de fungos de interesse
• País: BR
• Palavras-chave em Português: GDPase; Kluyveromyces lactis; Apirase; Leishmania major; Leishmaniose
• Palavras-chave em Inglês: GDPase; Kluyveromyces lactis; Apirase; Leishmania major; Leishmaniasis
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::FISIOLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/5312

The yeast Kluyveromyces lactis has a potential applicability as a host in biotechnological production of heterologous recombinant proteins of biotechnological interest. In this context the objective of this work was to express the protein of Leishmania major GDPase for biotechnology applied to human and canine leishmaniasis. The GDPase of L. major belongs to the family of E-NTPDases or apirases, proteins involved in infectivity and virulence of parasites. For a system of expression and secretion of heterologous proteins in K. lactis, the technique of polymerase chain reaction (PCR) was used to amplify a sequence of 2073 bp covering the complete coding region of the GDPase "of L. major, which is inserted into the amplicon plasmid pKLAC1 sites in Sal I and Bgl II.The construction pKLAC1- GDPase was confirmed by PCR, linearized by the enzyme Ahd I and used for transformation of wild strain CBS 2359. The transformants were selected in YCB medium containing 5 mM acetamide induced in batch and in YPGal. Extract and supernatant of these cultures were analyzed by SDS-PAGE and Western blot using a polyclonal antiserum anti-GDPase of L. major. The analysis revealed a single protein of approximately 120 kDa in the wild strains and transformants of K. lactis. Perform a search in GenBank are two homologous genes in the genome of yeast: KlGDA1 and KlYND1que may explain the cross-reactivity. The results point to the failure to obtain transformants producing GDPase of L. major, probably due not to reconstitute the promoter PLAC4 that would direct the expression of the gene of GDPase. But that raises the chances of a wild strain to be tested as to induce the production of antibodies against species of the genus Leishmania and signal that the system contains flaws that compromise its use due to the dependence of reconstitution of the promoter PLAC4.