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• W2100063740 abstract "We characterized by crystallographic, calorimetric and biochemical methods the action of a low molecular weight compound, 3-(2-benzothiazolylthio)-1-propanesulfonic acid (compound 8) that binds to the dimer interface of triosephosphate isomerase from Trypanosoma cruzi (TcTIM) and thereby abolishes its function with a high level of selectivity. The kinetics of TcTIM inactivation by the agent and isothermal titration calorimetry experiments showed that the binding of two molecules of the compound per enzyme is needed for inactivation. The binding of the first molecule is endothermic, and that of the second exothermic. Crystals of TcTIM in complex with one molecule of the inactivating agent that diffracted to a resolution of 2 Å were obtained. The compound is at the dimer interface at less than 4 Å from residues of the two subunits. Compound 8 is more effective at low than at high protein concentrations, indicating that it perturbs the association between the two TcTIM monomers. Calorimetric and kinetic data of experiments in which TcTIM was added to a solution of the inactivating agent showed that at low concentrations of the compound, inactivation is limited by binding, whereas at high concentrations of the agent, the events that follow binding become rate-limiting. The portion of the interface of TcTIM that binds the benzothiazole derivative and its equivalent region in human TIM differs in amino acid composition and hydrophobic packing. Thus, we show that by focusing on protein–protein interfaces, it is possible to discover low molecular weight compounds that are selective for enzymes from parasites." @default.
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• W2100063740 date "2004-08-01" @default.
• W2100063740 modified "2023-10-17" @default.
• W2100063740 title "Inactivation of Triosephosphate Isomerase from Trypanosoma cruzi by an Agent that Perturbs its Dimer Interface" @default.
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• W2100063740 doi "https://doi.org/10.1016/j.jmb.2004.06.056" @default.
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