Activated Ion Electron Transfer Dissociation for Improved Fragmentation of Intact Proteins.

Activated Ion Electron Transfer Dissociation for Improved Fragmentation of Intact Proteins.
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DOI:
10.1021/acs.analchem.5b00881
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发表时间:
2015-07-21
影响因子:
7.4
通讯作者:
Coon, Joshua J.
Coon, Joshua J.
中科院分区:
化学1区
文献类型:
--
作者:
Riley, Nicholas M.;Westphall, Michael S.;Coon, Joshua J.

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Here we report the first implementation of activated ion electron transfer dissociation (AI-ETD) for top down protein characterization, showing that AI-ETD definitively extends the m/z range over which ETD can be effective for fragmentation of intact proteins. AI-ETD, which leverages infrared photon bombardment concurrent to the ETD reaction to mitigate nondissociative electron transfer, was performed using a novel multipurpose dissociation cell that can perform both beam-type collisional dissociation and ion–ion reactions on an ion trap–Orbitrap hybrid mass spectrometer. AI-ETD increased the number of c- and z-type product ions for all charge states over ETD alone, boosting product ion yield by nearly 4-fold for low charge density precursors. AI-ETD also outperformed HCD, generating more matching fragments for all proteins at all charge states investigated. In addition to generating more unique fragment ions, AI-ETD provided greater protein sequence coverage compared to both HCD and ETD. In all, the effectiveness of AI-ETD across the entirety of the m/z spectrum demonstrates its efficacy for robust fragmentation of intact proteins.
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