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. Author manuscript; available in PMC: 2010 Jul 29.
Published in final edited form as: J Proteome Res. 2008 Sep 4;7(10):4603–4608. doi: 10.1021/pr800456q

Figure 4.

Figure 4

Mechanistic study of the in vitro modification with a mass shift of −19 at lysine. (A) MS/MS of the unmodified histone H4 peptide, DNIQGITKPAIR. (B) MS/MS spectrum of the modified histone H4 peptide with loss of 19 Da at lysine, DNIQGIT−19KPAIR. (C) A possible molecular mechanism of in vitro protein modification resulting in a mass shift of −19 Da at lysine.