Estudos quantitativos multidimensionais de correlação estrutura-atividade de inibidores peptídicos da HIV-1 protease

Abstract

AIDS is a disease provoked by a specific virus, which affects the immunologic defense system. HIV-1 protease is a homodimer, which plays the role of "molecular scissors" in cleaving several non-functional polyproteins into smaller and functional proteins in order to generate mature proteins. According to The Joint United Nations Programme on HIV/AIDS - UNAIDS (2009), latest informative, it is estimated that 34,000,000 persons live with HIV/AIDS all over the world. Quantitative studies of structure-activity relationship on 5D and 6D (QSAR-5D and 6D) of 46 peptide inhibitors with central vicinal diol grouping of HIV-1 protease, were performed by using QSAR-5D (RAPTOR, Receptor as Poly Tier Object Representation) and QSAR-6D (QUASAR, The quase-atomistic receptor modeling). Twelve compounds, which did not make part of the calculations at the step of generating the models, were used to validate the QSAR-5D and 6D methods. The QSAR-5D and 6D models were generated only by utilizing the partial least square methodology. The best model of the QSAR-5D method generated values of R2Training and R2Test equal to 0.944 and 0.793, respectively. The best model of the QSAR-6D method generated values of e R2Training and R2Test equal to 0.001 and 0.-0,040, respectively. Then, the methods will be useful to map the interaction sites of compounds under study and propose structural modifications with the objective of making them more potent and, consequently, better HIV-1 protease inhibitors.