Mass spectrometric characterization of human histone H3: a bird's eye view - PubMed (original) (raw)

Mass spectrometric characterization of human histone H3: a bird's eye view

C Eric Thomas et al. J Proteome Res. 2006 Feb.

Abstract

The modification of H3 in asynchronous HeLa cells was profiled using Top Down Mass Spectrometry. A broad distribution of species differing by 14 Da and containing less than 3% unmodified protein was observed for all three variants. Species of up to +168 Da were observed for H3.1, and fragmentation of all species by Electron Capture Dissociation (ECD) revealed approximately 5% methylation of K4 and approximately 50% dimethylation of K9. K14 and K23 were major sites of acetylation. H3.3 was slightly hypermodified with the apex of the distribution shifted by approximately +14 Da compared to H3.1. H3.1 (50% and 15%) from colchicine-treated cells was monophosphorylated and diphosphorylated, respectively, with equivalent modification of S10 and S28.

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