Abstract
We propose a tandem mass spectrometry method that combines electron-transfer dissociation (ETD) with simultaneous collision-induced dissociation (CID), termed ETD/CID. This technique can provide more complete sequence coverage of peptide ions, especially those at lower charge states. A selected precursor ion is isolated and subjected to ETD. At the same time, a residual precursor ion is subjected to activation via CID. The specific residual precursor ion selected for activation will depend upon the charge state and m/z of the ETD precursor ion. Residual precursor ions, which include unreacted precursor ions and charge-reduced precursor ions (either by electron-transfer or proton transfer), are often abundant remainders in ETD-only reactions. Preliminary results demonstrate that during an ETD/CID experiment, b, y, c, and z-type ions can be produced in a single experiment and displayed in a single mass spectrum. While some peptides, especially doubly protonated ones, do not fragment well by ETD, ETD/CID alleviates this problem by acting in at least one of three ways: (1) the number of ETD fragment ions are enhanced by CID of residual precursor ions, (2) both ETD and CID-derived fragments are produced, or (3) predominantly CID-derived fragments are produced with little or no improvement in ETD-derived fragment ions. Two interesting scenarios are presented that display the flexibility of the ETD/CID method. For example, smaller peptides that show little response to ETD are fragmented preferentially by CID during the ETD/CID experiment. Conversely, larger peptides with higher charge states are fragmented primarily via ETD. Hence, ETD/CID appears to rely upon the fundamental reactivity of the analyte cations to provide the best fragmentation without implementing any additional logic or MS/MS experiments. In addition to the ETD/CID experiments, we describe a novel dual source interface for providing front-end ETD capabilities on a linear ion trap mass spectrometer.
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Published online May 20, 2009
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Campbell, J.L., Hager, J.W. & Le Blanc, J.C.Y. On performing simultaneous electron transfer dissociation and collision-induced dissociation on multiply protonated peptides in a linear ion trap. J Am Soc Mass Spectrom 20, 1672–1683 (2009). https://doi.org/10.1016/j.jasms.2009.05.009
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DOI: https://doi.org/10.1016/j.jasms.2009.05.009