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

Andrew N. Hoofnagle, Katheryn A. Resing, Elizabeth J. Goldsmith, Natalie G. Ahn

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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.

Original languageEnglish (US)
Pages (from-to)956-961
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number3
StatePublished - Jan 30 2001


ASJC Scopus subject areas

  • General

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