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. Author manuscript; available in PMC: 2017 Sep 2.
Published in final edited form as: J Proteome Res. 2016 Aug 18;15(9):3139–3146. doi: 10.1021/acs.jproteome.6b00266

Figure 2.

Figure 2

Oxidation of LFTFHADIC(cam)TLPDTEK via ion/ion reaction with IO4−. Activation of (a) [M + 2H + IO4]+, (b) [M + H + O]+, and (c) dehydroalanine product formed upon HOScam loss from the [M + H + O]+ species. Insets show structures of (a) cam-modified cysteine, (b) the modified side-chain upon oxidation, and (c) the dehydroalanine residue produced upon loss of HOScam. Symbols are as follows: (red squares) loss of HOSR to form the dehydroalanine product, (○) water losses, (*) ammonia losses, (lightning bolts) species subjected to CID, and (□) fragment ions that have lost the HOSR group.