N-(L-isoaspartyl)-glycine (Asn) -17.026548385620117188 -17.030000686645507812 155.0456695556640625 155.1300048828125 2-amino-N4-(carboxymethyl)-butanediamic acid natural N-term C 6 H 7 N 2 O 3 XLNK-4Asp-NGly(Asn) A protein modification that effectively crosslinks an L-asparagine residue and a glycine residue by an isopeptide bond with formation of N-(L-isoaspartyl)glycine and the release of ammonia. G, N isoaspartyl glycine N-(L-isoaspartyl)-glycine N4-(carboxymethyl)-asparagine Cross-link 2. MOD:00135 PSI-MOD N-beta-aspartylglycine H -3 N -1 CROSSLNK Isoaspartyl glycine isopeptide (Asn-Gly) CROSSLNK Isoaspartyl glycine isopeptide (Gly-Asn) (2S)-2-amino-4-(carboxymethyl)amino-4-oxobutanoic acid crosslinked residues with loss of ammonia N-(L-isoaspartyl)-glycine crosslinked L-asparagine residue