Oxidative modification of a carboxyl-terminal vicinal methionine in calmodulin by hydrogen peroxide inhibits calmodulin-dependent activation of the plasma membrane Ca-ATPase

Biochemistry
Y YaoT C Squier

Abstract

In order to investigate the possibility that calmodulin (CaM) may be a principal target of reactive oxygen species (ROS) produced under conditions of oxidative stress, we have examined wheat germ CaM for the presence of highly reactive sites that correlate with the loss of function. Using reversed-phase HPLC and FAB mass spectrometry after proteolytic digestion, we have identified the sites of modification by hydrogen peroxide. We find that one of the vicinal methionines (i.e., Met146 or Met147) near the C-terminus of CaM is selectively oxidized. The ability of CaM to bind and to activate the plasma membrane (PM)-Ca-ATPase from erythrocytes was measured. There is a 30-fold decrease in the calcium affinity of oxidatively modified CaM. While there is a little change in the binding constant between the carboxyl-terminal domain of calcium-saturated CaM and a peptide homologous to the autoinhibitory sequence of the PM-Ca-ATPase, we find that there is a 9-fold reduction in the affinity of the amino-terminal domain of CaM with respect to the ability to bind target peptides. The extent of oxidative modification to one of the vicinal methionines near the carboxyl-terminal domain correlates with the loss of CaM-dependent activation of th...Continue Reading

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