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A Study on Immonium Ions and Immonium-Related Ions Depending on Different Collision Energies as Assessed by Q-TOF MS

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Abstract

Immonium ions and immonium-related ions commonly appear in the mass spectra of peptide precursor ions. An overall understanding of the variation of the abundance of these ions is beneficial for the identification of unknown peptides. Here, four peptides from mass spectrometry (MS) of sucrose phosphorylase were selected as precursor ions, and the frequency of immonium ions and immonium-related ions in a dataset containing 130 MS/MS spectra were examined. Immonium ions and immonium-related ions were mainly produced from the further fragmentation of a-, b-, and y-ions. At the optimal collision energy (CE), the immonium ions of leucine at m/z 86, isoleucine at m/z 86, glutamine at m/z 101, arginine at m/z 129, tryptophan at m/z 159, proline at m/z 70, valine at m/z 72, glutamic acid at m/z 102, phenylalanine at m/z 120, and tyrosine at m/z 136, as well as the immonium-related ions of methionine at m/z 61, lysine at m/z 84, glutamine at m/z 84, and tyrosine at m/z 91 existed in higher abundance and had higher confidence level, therefore suggesting the presence of corresponding amino acid residues well. However, the immonium ions of serine at m/z 60 and threonine at m/z 74, although showing lower abundance, were stable at high CE and had higher confidence level, indicating the presence of serine and threonine residues, respectively. The immonium ion of asparagine at m/z 87 also was a good indicator for the existence of asparagine residue.

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Abbreviations

Q-TOF:

quadrupole–time-of-flight

MS:

mass spectrometry

CE:

collision energy

CID:

collision-induced dissociation

PA:

proton affinity

DTT:

D,L-dithiothreitol

IAA:

iodoacetamide

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Authors and Affiliations

  1. State Forestry Administration Key Open Laboratory, International Centre for Bamboo and Rattan, Beijing, 100102, China

    C. Guo, X. F. Guo, L. Zhao, D. D. Chen, J. Wang & J. Sun

Authors
  1. C. Guo
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  2. X. F. Guo
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  3. L. Zhao
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  4. D. D. Chen
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  5. J. Wang
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  6. J. Sun
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Correspondence to X. F. Guo.

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Guo, C., Guo, X.F., Zhao, L. et al. A Study on Immonium Ions and Immonium-Related Ions Depending on Different Collision Energies as Assessed by Q-TOF MS. Russ J Bioorg Chem 44, 408–415 (2018). https://doi.org/10.1134/S1068162018040088

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  • DOI: https://doi.org/10.1134/S1068162018040088

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