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. Author manuscript; available in PMC: 2013 Aug 30.
Published in final edited form as: Chem Biol Interact. 2012 May 31;199(2):120–128. doi: 10.1016/j.cbi.2012.05.009

Figure 4.

Figure 4

PDI peptide ILFIFIDSDHTDNQR (288–302) adducted by naphthalene diol epoxide with a MASCOT ion score of 96. A is the fragmentation pattern with depicted b- and y-series ions for the adducted peptide. B is the CID spectrum of [M+H]2+ at m/z 1006 of the adducted peptide; NDO is bound to His297. Italicized ions y11 – y13 and b10 are modified y-ions in the presence of the NDO. Italicized b10 (m/z 1379.8098) represents the modified N-terminal fragment with histidine. The peptide was doubly charged.