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. Author manuscript; available in PMC: 2016 Mar 4.
Published in final edited form as: Biochemistry. 2007 Jul 6;46(30):8798–8806. doi: 10.1021/bi700667v

FIGURE 5.

FIGURE 5

Low-energy CID spectrum of the EPI-nitrene-modified Gln184−Lys203 tryptic peptide, precursor ion at m/z 668.1 (4+). Assignments were made according to the nomenclature of Biemann (39). The modification occurred at Tyr195 as indicated by the unmodified N-terminal b ions (up to b6 in black) and C-terminal y fragments (up to y8 in blue) and the modified immonium y ion and internal fragments (in red). For simplicity labeling involves mostly sequence ions and internal fragments containing the modified residue. Carbamidomethylcysteines are designated as C*.