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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2017 Jan 3;28(6):991–1004. doi: 10.1007/s13361-016-1554-2

Figure 1.

Figure 1

Oxidation of ARACmAKA via ion/ion reactions with HSO5−, where Cm indicates a cysteine residue protected with N-hydroxymaleimide. CID of (a) the ion/ion complex between doubly protonated ARACmAKA and HSO5−, (b) the [M+H+O]+ species, (c) loss of (R+H2O) from the oxidized species, and (d) the dehydroalanine species generated upon loss of the alkyl sulfenic acid from the oxidized species. Lightning bolts indicate the species subjected to CID. Asterisks indicate ammonia losses, degree signs indicate water losses, red and blue squares indicate loss of RSOH and (R+H2O) from the oxidized species, respectively. Red/blue fragments with square superscripts indicate fragment ions that have lost RSOH/(R+H2O).