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Previous issue date: 2017 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === O tratamento das leucemias ? desafiador por v?rios aspectos, entre os quais podem ser destacados os efeitos adversos e a obten??o de op??es terap?uticas de alta qualidade e de custos razo?veis. A utiliza??o da enzima L-asparaginase como agente terap?utico, limita a fonte ex?gena de asparagina, da qual as c?lulas malignas dependem para o metabolismo celular e para a sobreviv?ncia. Essa ? uma op??o que oferece menores riscos ao paciente e ?s c?lulas sadias, que s?o capazes de sintetizar este amino?cido. Neste cen?rio o objetivo deste trabalho foi selecionar, entre fungos filamentosos, linhagens produtoras da enzima L-asparaginase. O estudo tamb?m buscou avaliar o efeito da varia??o da fonte de carbono e da raz?o carbono-nitrog?nio no crescimento e na express?o da atividade enzim?tica, a fim de desenvolver meios de cultivo para o processo produtivo. Realizou-se tamb?m um estudo do crescimento apical das tr?s linhagens selecionadas, duas do g?nero Penicillium sp. e uma do g?nero Fusarium sp., em diversos meios de cultivo. O conhecimento gerado sobre as linhagens produtoras e os demais estudos realizados permitiram a obten??o de um meio de cultivo que possibilitou a produ??o enzim?tica em at? 11,45 U.min-1.mL-1 com a linhagem de Fusarium sp. === Disserta??o (Mestrado) ? Programa de P?s-gradua??o em Ci?ncias Farmac?uticas, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2016. === The treatment of leukemia is challenging in many ways, including the adverse effects and obtaining treatment options of high quality and reasonable cost. The use of L-asparaginase enzyme as a therapeutic agent limits the exogenous source of asparagine, which the malignant cells depend for cellular metabolism and survival. This option offers lower risk to patients and healthy cells, which are able to synthesize this amino acid. Therefore, the objective of this work was to select among filamentous fungi, producing strains of L-asparaginase enzyme. The study also aimed at evaluating the effect of varying the carbon source and carbon-nitrogen ratio in the growth and expression of the enzymatic activity to develop culture media for the production process. It was also carried out a study of the apical growth of the three strains selected, two of the genus Penicillium sp. and one Fusarium sp., cultivated in various culture media. The knowledge about the growth of the strains studied in different nutritional sources and other studies allowed obtaining a culture medium that enabled the enzyme production of 11.45 U.min-1.mL-1 by Fusarium sp.
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