ArticleJournal of the American Society for Mass Spectrometry2008
Why are a(3) ions rarely observed?
Article in Journal of the American Society for Mass Spectrometry, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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Who cites it
21 citing papers in PubMed.
- Weak Acid-Base Interactions of Histidine and Cysteine Affect the Charge States, Tertiary Structure, and Zn(II)-Binding of Heptapeptides.Journal of the American Society for Mass Spectrometry · 2019Article
- Thermodynamics and Reaction Mechanisms for Decomposition of a Simple Protonated Tripeptide, HJournal of the American Society for Mass Spectrometry · 2019Article
- Thermodynamics and Reaction Mechanisms of Decomposition of the Simplest Protonated Tripeptide, Triglycine: A Guided Ion Beam and Computational Study.Journal of the American Society for Mass Spectrometry · 2017Article
- Investigation of bn-44 peptide fragments using high resolution mass spectrometry and isotope labeling.Journal of the American Society for Mass Spectrometry · 2014Article
- Structures of a(n)* ions derived from protonated pentaglycine and pentaalanine: results from IRMPD spectroscopy and DFT calculations.Journal of the American Society for Mass Spectrometry · 2013Article
- Fragmentation reactions of methionine-containing protonated octapeptides and fragment ions therefrom: an energy-resolved study.Journal of the American Society for Mass Spectrometry · 2013Article
- Gas-phase fragmentation of oligoproline peptide ions lacking easily mobilizable protons.Journal of the American Society for Mass Spectrometry · 2013Article
- Using gas-phase guest-host chemistry to probe the structures of b ions of peptides.Journal of the American Society for Mass Spectrometry · 2012Article
- The influence glutamic acid in protonated bInternational journal of mass spectrometry · 2012Article
- Conformation-specific spectroscopy of peptide fragment ions in a low-temperature ion trap.Journal of the American Society for Mass Spectrometry · 2012Article
- Influence of a Gamma Amino Acid on the Structures and Reactivity of Peptide a(3) Ions.International journal of mass spectrometry · 2012Article
- Fragmentation reactions of b(5) and a (5) ions containing proline--the structures of a(5) ions.Journal of the American Society for Mass Spectrometry · 2012Article
- Relative stability of peptide sequence ions generated by tandem mass spectrometry.Journal of the American Society for Mass Spectrometry · 2012Article
- Rearrangement pathways of the a (4) ion of protonated YGGFL characterized by IR spectroscopy and modeling.Journal of the American Society for Mass Spectrometry · 2012Article
- Towards understanding the tandem mass spectra of protonated oligopeptides. 2: The proline effect in collision-induced dissociation of protonated Ala-Ala-Xxx-Pro-Ala (Xxx = Ala, Ser, Leu, Val, Phe, and Trp).Journal of the American Society for Mass Spectrometry · 2011Article
- Structural heterogeneity of doubly-charged peptide b-ions.Journal of the American Society for Mass Spectrometry · 2011Article
- Effect of the His residue on the cyclization of b ions.Journal of the American Society for Mass Spectrometry · 2010Article
- Structural characterization of intact proteins is enhanced by prevalent fragmentation pathways rarely observed for peptides.Journal of the American Society for Mass Spectrometry · 2010Article
- Cyclization of peptide b9 ions.Journal of the American Society for Mass Spectrometry · 2009Article
- Charge-separation reactions of doubly-protonated peptides: effect of peptide chain length.Journal of the American Society for Mass Spectrometry · 2009Article
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Authors and funding
7 authors.
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No grant is acknowledged in the PubMed record.
Abstract
It has been determined experimentally that a(3) ions are generally not observed in the tandem mass spectroscopic (MS/MS) spectra of b(3) ions. This is in contrast to other b(n) ions, which often have the corresponding a(n) ion as the base peak in their MS/MS spectra. Although this might suggest a different structure for b(3) ions compared to that of other b(n) ions, theoretical calculations indicate the conventional oxazolone structure to be the lowest energy structure for the b(3) ion of AAAAR, as it is for other b(n) ions of this peptide. However, it has been determined theoretically that the a(3) ion is lower in energy than other a(n) ions, relative to the corresponding b ions. Furthermore, the a(3) --> b(2) transition structure (TS) is lower in energy than other a(n) --> b(n-1) TSs of AAAAR, compared with the corresponding b ions. Consequently, it is suggested that the b(3) ion does fragment to the a(3) ion, but that the a(3) ion then immediately fragments (to b(2) and a(3)) because of the excess internal energy arising from its relatively low energy and the facile a(3) --> b(2) reaction. That is why a(3) ions are not observed in the MS/MS spectra of b(3) ions.
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