Abstract
Histones represent a class of proteins ideally suited to analyses by top-down mass spectrometry due to their relatively small size, the high electron transfer dissociation-compatible charge states they exhibit, and the potential to gain valuable information concerning combinatorial post-translational modifications and variants. We recently described new methods in mass spectrometry for the acquisition of high-quality MS/MS spectra of intact proteins (Anderson, L. C., English, A. M., Wang, W., Bai, D. L., Shabanowitz, J., and Hunt, D. F. (2015) Int. J. Mass Spectrom. 377, 617-624). Here, we report an extension of these techniques. Sequential ion/ion reactions carried out in a modified Orbitrap Velos Pro/Elite(TM) capable of multiple fragment ion fills of the C-trap, in combination with data-dependent and targeted HPLC-MS experiments, were used to obtain high resolution MS/MS spectra of histones from butyrate-treated HeLa cells. These spectra were used to identify several unique intact histone proteoforms with up to 81% sequence coverage. We also demonstrate that parallel ion parking during ion/ion proton transfer reactions can be used to separate species of overlapping m/z that are not separated chromatographically, revealing pr...Continue Reading
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