Synchrotron Radiolysis and Mass Spectrometry: A New Approach to Research on the Actin Cytoskeleton

Jing Qu Guan, Steven C. Almo, Mark R. Chance

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Hydroxyl radicals generated from millisecond exposure of aqueous solutions to synchrotron X-rays react with proteins to yield stable oxidative modifications of solvent-accessible amino acid side chains. Following proteolysis, HPLC/MS analysis is performed to quantitate the side chain reactivities, and MS/MS analysis is used to identify the modification site(s). Side chain reactivity is shown to be correlated with solvent accessibility; thus the method provides detailed site-specific information about protein structure. The application of these techniques to the study of the actin cytoskeleton is described in detail, including defining the binding sites of monomeric actin with gelsolin segment-1, the actin monomer binding surface on cofilin, the divalent cation-dependent structure changes of monomeric actin, and the conformational changes associated with actin filamentous assembly.

Original languageEnglish (US)
Pages (from-to)221-229
Number of pages9
JournalAccounts of Chemical Research
Issue number4
StatePublished - Apr 2004

ASJC Scopus subject areas

  • Chemistry(all)


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