A enzima purina nucleosídeo fosforilase do parasita Schistosoma mansoni (SmPNP) é um alvo molecular atrativo para o desenvolvimento de candidatos a novos fármacos para o tratamento da esquistossomose, doença tropical negligenciada que afeta mais de 200 milhões de pessoas em todo mundo. No presente trabalho, estudos de cinética enzimática foram conduzidos para a determinação da potência e do mecanismo de inibição de uma série de inibidores da enzima SmPNP. Além das investigações bioquímicas, estudos cristalográficos e de modelagem molecular revelaram importantes bases moleculares para a afinidade de ligação frente à enzima alvo, levando ao desenvolvimento de relações entre a estrutura e atividade (SAR).The enzyme purine nucleoside phosphorylase from Schistosoma mansoni (SmPNP) is an attractive molecular target for the development of novel drugs against schistosomiasis, a neglected tropical disease that affects about 200 million people worldwide. In the present work, enzyme kinetic studies were carried out in order to determine the potency and mechanism of inhibition of a series of SmPNP inhibitors. In addition to the biochemical investigations, crystallographic and molecular modeling studies revealed important molecular features for binding affinity towards the target enzyme, leading to the development of structure-activity relationships (SAR).
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