Cyclen based lanthanide ion ribonuclease mimics: the effect of pyridine cofactors upon phosphodiester HPNP hydrolysis |
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Authors: | Thorfinnur Gunnlaugsson R. Jeremy H. Davies Paul Jensen Sinead Mulready Clarke S. Stevenson |
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Affiliation: | a Department of Chemistry, Centre for Synthesis and Chemical Biology, Trinity College Dublin, Dublin 2, Ireland b School of Biology and Biochemistry, Queen’s University of Belfast, Belfast BT9 7BL, Northern Ireland |
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Abstract: | The cyclen based pyridine complexes 1Ln-3Ln (Ln = La(III) and Eu(III)) were synthesised as metallo-ribonuclease mimics and their ability to hydrolytically cleave the phosphodiester of HPNP at 37 °C was investigated using UV-vis spectroscopy, whereas the binding of the substrate was evaluated using 31P NMR and Eu(III)-luminescent measurements. In contrast 2La gave rise to fast pH dependent hydrolysis of HPNP, with maximum efficiency at ca. pH 8.2, and with a half-lifetime of ∼1 h, the 1Ln and 3Ln complexes were found to be inactive, emphasizing the importance of the nature of the pyridine isomer as a cofactor in the hydrolytic process. |
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Keywords: | Ribonuclease mimics Lanthanides Eu(III) La(III) Hydrolysis HPNP Cyclen |
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