crosslinked residues with loss of ammonia 2-(2-aminosuccinimidyl)pentanedioic acid (Asn) -17.026548385620117188 -17.030000686645507812 226.0589752197265625 226.19000244140625 none PSI-MOD Cross-link 2. MOD:01940 aspartimide glutamic acid A protein modification that crosslinks an asparagine and the following glutamic acid residue with the formation of (2-aminosuccinimidyl)pentanedioic acid and the release of ammonia. (4S)-4-[(3S)-3-amino-2,5-dioxopyrrolidin-1-yl]-5-oxopentanoic acid C 9 H 10 N 2 O 5 natural 2-(2-aminosuccinimidyl)pentanedioic acid E, N H -3 N -1 2-(2-aminosuccinimidyl)pentanedioic acid crosslinked L-asparagine residue