Abstract
Mass spectrometry (MS)-based methods typically assess acetylation by detection of a diagnostic ion at 126.1 m/z, corresponding to the immonium ion of acetyl-lysine –NH3, which is generated by collisionally induced dissociation. A novel implementation of this approach, based on the accurate mass and retention time technique, couples high mass resolution measurement with rapid cycling between low and elevated collision energies to generate intact and fragment high-resolution mass spectra. This allows acetyl lysine diagnostic ions at 126.1 m/z to be monitored and aligned to the precursor m/z based on retention time profile. The technique is termed Collisionally Induced Release of Acetyl Diagnostic. Sequence information is also obtained for acetylation site assignment. This technique to identify acetylation species is information independent as it does not require the sequence of the protein/peptides to identify acetylation, and thus complementary to data-dependent methods. It is suitable for analysis of acetylated peptides, or proteins enriched by immunoprecipitation with acetyl lysine-specific antibodies.
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Acknowledgements
Financial support from the Engineering and Physical Sciences Research Council, ChELSI initiative EP/E036252/1 (CE, OSY, PCW), Cancer Research UK (DS), and Biochemical Biophysical Research Council (BMC). We thank the Bruker Daltonik GmbH research team, in particular Peter Sander, for provision and discussion on the Dissect algorithm.
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Evans, C.A., Ow, S.Y., Smith, D.L., Corfe, B.M., Wright, P.C. (2013). Application of the CIRAD Mass Spectrometry Approach for Lysine Acetylation Site Discovery. In: Hake, S., Janzen, C. (eds) Protein Acetylation. Methods in Molecular Biology, vol 981. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-62703-305-3_2
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DOI: https://doi.org/10.1007/978-1-62703-305-3_2
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