Inhibition of peroxidase-catalyzed protein tyrosine nitration by antithyroid drugs and their analogues
作者:Krishna P. Bhabak、Govindasamy Mugesh
DOI:10.1016/j.ica.2010.03.048
日期:2010.10
nitration of L-tyrosine reveals that the presence of thione/selone moiety is important for the inhibition. Although the presence of a free N-H group adjacent to C=S moiety is necessary for most of the thiones to inhibit the LPO-catalyzed nitration, the corresponding selones do not require the presence of any free N-H group for their activity. Furthermore, experiments with different concentrations of H2O2
In contrast to thiones and selones, the S- and Se-protected compounds do not show any noticeable inhibition under identical experimental conditions. While the inhibition of LPO by MMI cannot be reversed by increasing the hydrogen peroxide concentration, the inhibition by MSeI can be completely reversed by increasing the peroxide concentration. Experimental and theoretical studies were performed on
Anti-Thyroid Drugs and Thyroid Hormone Synthesis: Effect of Methimazole Derivatives on Peroxidase-Catalyzed Reactions
作者:Gouriprasanna Roy、G. Mugesh
DOI:10.1021/ja054497u
日期:2005.11.1
moiety is important for the LPO inhibition. The kinetic and mechanisticstudies reveal that MSeI inhibits the LPO activity by reducing the H(2)O(2), providing a novel method to reversibly inhibit the enzyme. Although MSeI strongly inhibits LPO, the enzyme's activity can be completely recovered by increasing the H(2)O(2) concentration. On the other hand, the inhibition by methimazole (MMI), the sulfur