Journal
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
Volume 21, Issue 8, Pages 1455-1465Publisher
SPRINGER
DOI: 10.1016/j.jasms.2010.04.007
Keywords
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Funding
- US National Science Foundation [CHE-0431991, CHE-0518234]
- National Institutes of Health [P41-RR018942, 5RC1GM090797-02]
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Singly-protonated proline-containing peptides with N-terminal arginine are photodissociated with vacuum ultraviolet (VUV) light in an ESI linear ion trap/orthogonal-TOF (LIT/o-TOF). When proline is the n(th) residue from the N-terminus, unusual b(n) + 2 and a(n) + 2 ions are observed. Their formation is explained by homolytic cleavage of the C-alpha - C bond in conjunction with a rearrangement of electrons and an amide hydrogen. The latter is facilitated by a proline-stabilized gas-phase peptide conformation. (J Am Soc Mass Spectrom 2010, 21, 1455-1465) (C) 2010 American Society for Mass Spectrometry
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