RESUMO
Catalytic nucleic acids consisting of a bis-Zn2+ -pyridyl-salen-type ([di-ZnII 3,5 bis(pyridinylimino) benzoic acid]) complex conjugated to the ATP aptamer act as ATPase-mimicking catalysts (nucleoapzymes). Direct linking of the Zn2+ complex to the 3'- or 5'-end of the aptamer (nucleoapzymesâ I and II) or its conjugation to the 3'- or 5'-end of the aptamer through bis-thymidine spacers (nucleoapzymesâ III and IV) provided a set of nucleoapzymes exhibiting variable catalytic activities. Whereas the separated bis-Zn2+ -pyridyl-salen-type catalyst and the ATP aptamer do not show any noticeable catalytic activity, the 3'-catalyst-modified nucleoapzyme (nucleoapzymeâ IV) and, specifically, the nucleoapzyme consisting of the catalyst linked to the 3'-position through the spacer (nucleoapzymeâ III) reveal enhanced catalytic features in relation to the analogous nucleoapzyme substituted at the 5'-position (kcat =4.37 and 6.88â min-1 , respectively). Evaluation of the binding properties of ATP to the different nucleoapzyme and complementary molecular dynamics simulations suggest that the distance separating the active site from the substrate linked to the aptamer binding site controls the catalytic activities of the different nucleoapzymes.