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Journal Article
Research Support, N.I.H., Extramural
High resolution electron transfer dissociation studies of unfractionated intact histones from murine embryonic stem cells using on-line capillary LC separation: determination of abundant histone isoforms and post-translational modifications.
Epigenetic regulation of chromatin is dependent on both the histone protein isoforms and state of their post-translational modifications. The assignment of all post-translational modification sites for each individual intact protein isoform remains an experimental challenge. We present an on-line reversed phase LC tandem mass spectrometry approach for the separation of intact, unfractionated histones and a high resolution mass analyzer, the Orbitrap, with electron transfer dissociation capabilities to detect and record accurate mass values for the molecular and fragment ions observed. From a single LC-electron transfer dissociation run, this strategy permits the identification of the most abundant intact proteins, determination of the isoforms present, and the localization of post-translational modifications.
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