Binding properties of ferrocene–glutathione conjugates as inhibitors and sensors for glutathione S-transferases
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Martos Maldonado, Manuel Cristo![University of Almería authority University of Almería authority](/themes/Mirage2/images/autoridades/autoridad.png)
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2012-02Abstract
The binding properties of two electroactive glutathione–ferrocene conjugates that consist in glutathione attached to one or both of the cyclopentadienyl rings of ferrocene (GSFc and GSFcSG), to Schistosoma japonica glutathione S-transferase (SjGST) were studied by spectroscopy fluorescence, isothermal titration calorimetry (ITC) and differential pulse voltammetry (DPV). Such ferrocene conjugates resulted to be competitive inhibitors of glutathione S-transferase with an increased binding affinity relative to the natural substrate glutathione (GSH). We found that the conjugate having two glutathione units (GSFcSG) exhibits an affinity for SjGST approximately two orders of magnitude higher than GSH. Furthermore, it shows negative cooperativity with the affinity for the second binding site two orders of magnitude lower than that for the first one. We propose that the reason for such negative cooperativity is steric since, i) the obtained thermodynamic parameters do not indicate profound co...
Palabra/s clave
Ferrocene–glutathione conjugates
Binding
Voltammetry
Calorimetry
Electrochemical sensors
Docking
Cooperativity
Glutathione S-transferase