Nano Archive

Charge state dependent fragmentation of gaseous [alpha]-synuclein cations via ion trap and beam-type collisional activation

Chanthamontri, Chamnongsak and Liu, Jian and McLuckey, Scott A. (2009) Charge state dependent fragmentation of gaseous [alpha]-synuclein cations via ion trap and beam-type collisional activation. International Journal of Mass Spectrometry, 283 (1-3). 9 - 16.

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Official URL: http://www.sciencedirect.com/science/article/B6VND...

Abstract

Ions derived from nano-electrospray ionization (nano-ESI) of α-synuclein, a 14.5 kDa, 140 amino acid residue protein that is a major component of the Lewy bodies associated with Parkinson's disease, have been subjected to ion trap and beam-type collisional activation. The former samples products from fragmentation at rates generally lower than 100 s−1 whereas the latter samples products from fragmentation at rates generally greater than 103 s−1. A wide range of protein charge states spanning from as high as [M+17H]17+ to as low as [M+4H]4+ have been formed either directly from nano-ESI or via ion/ion proton transfer reactions involving the initially formed protein cations and have been subjected to both forms of collision-induced dissociation (CID). The extent of sequence information (i.e., number of distinct amide bond cleavages) available from either CID method was found to be highly sensitive to protein precursor ion charge state. Furthermore, the relative contributions of the various competing dissociation channels were also dependent upon precursor ion charge state. The qualitative trends in the changes in extent of amide bond cleavages and identities of bonds cleaved with precursor ion charge state were similar for two forms of CID. However, for every charge state examined, roughly twice the primary sequence information resulted from beam-type CID relative to ion trap CID. For example, evidence for cleavage of 86% of the protein amide bonds was observed for the [M+9H]9+ precursor ion using beam-type CID whereas 41% of the bonds were cleaved for the same precursor ion using ion trap CID. The higher energies required to drive fragmentation reactions at rates necessary to observe products in the beam experiment access more of the structurally informative fragmentation channels, which has important implications for whole protein tandem mass spectrometry.

Item Type:Article
Additional Information:A Collection of Invited Papers Dedicated to Michael T. Bowers on the Occasion of his 70th Birthday
Uncontrolled Keywords:Ion/ion reaction; Top-down protein characterization; Ion trap collisional activation; Beam-type collisional activation
Subjects:Analytical Science > Microscopy and probe methods
Analytical Science > Metrology and standards in nanotechnology
ID Code:5661
Deposited By:SPI
Deposited On:04 Aug 2009 12:02
Last Modified:04 Aug 2009 12:02

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