Clonagem e expressão heteróloga, modelagem e interações intermoleculares da enolpiruvilchiquimato 3-fosfato sintase de Paracoccidioides brasiliensis

• Ano de defesa: 2017
• Autor(a) principal: Costa, Wanderson Lucas da
• Orientador(a): Pereira, Maristela
• Banca de defesa: Pereira, Maristela, Lacerda, Elisângela de Paula Silveira, Neves, Bruno Junior
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Genética e Biologia Molecular
• Departamento: Instituto de Ciências Biológicas - ICB (RG)
• País: Brasil
• Palavras-chave em Português: Expressão heteróloga; EPSP-sintase; Modelagem; Paracoccidioides brasiliensis; Pull down-GST; Via do chiquimato
• Palavras-chave em Inglês: Heterologus expression; EPSP-synthase; Modeling; Paracoccidioides brasiliensis; Pull down-GST; Shikimate pathway
• Área do conhecimento CNPq: GENETICA::GENETICA MOLECULAR E DE MICROORGANISMOS
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/7714

Paracoccidioides spp. are thermodymorphic fungi that when inhaled by humans, these conidia find a favorable environment, changing to the yeast phase and becoming pathogenic causing paracoccidioidomycosis (PCM), one of the most prevalent systemic mycoses in Brazil. Some antifungals are used in the treatment of PCM. Treatment depends on the patient's progression and tolerability of each drug, but their treatment may be for long periods and cause various side effects in the patient. The chiquimate pathway is coordinated by 7 enzymes that perform consecutive steps to convert erythrose-4-phosphate and phosphoenol pyruvate (PEP) into chorismate. In microorganisms, this pathway is involved in the production of the amino acids phenylalanine, tyrosine and tryptophan; These amino acids are essential to the maintenance of these organisms. In this work, pGEX4T3 vector cloning and heterologous expression of Pb18 EPSP synthase belonging to the chiquimate pathway were performed. This protein was expressed in E. coli (DE3) strain and purified. Antibodies were produced for expression analysis of the protein in Western blot. The modeling of EPSP synthase was performed aiming to identify the amino acids involved in the active site. The pull down-GST assay with soluble Pb18 proteins allowed the identification of 40 proteins that interact with EPSP synthase. These proteins belong to different functional categories, which are involved with the availability of phosphoenol pyruvate, the substrate necessary for the functioning of the chiquimate pathway.