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Changes in protein mobility accompany changes in conformation during the trans-activation of enzymes; however, few studies exist that validate or characterize this behavior. In this study, amide hydrogen/deuterium exchange/mass spectrometry was used to probe the conformational flexibility of extracellular signal-regulated protein kinase-2 before and after activation by phosphorylation. The exchange data indicated that extracellular regulated protein kinase-2 activation caused altered backbone flexibility in addition to the conformational changes previously established by x-ray crystallography. The changes in flexibility occurred in regions involved in substrate binding and turnover, suggesting their importance in enzyme regulation.

Changes in protein conformational mobility upon activation of extracellular regulated protein kinase-2 as detected by hydrogen exchange