crosslinked residues with loss of water N6-(L-isoaspartyl)-L-lysine (Asp) -18.010564804077148438 -18.020000457763671875 225.1113433837890625 225.2400054931640625 natural H -2 O -1 isoaspartyl N6-lysine C 10 H 15 N 3 O 3 D, K Cross-link 2. beta-(N6-lysyl)aspartyl acid CROSSLNK Isoaspartyl lysine isopeptide (Lys-Asn) XLNK-4Asp-N6Lys(Asp) A protein modification that effectively crosslinks an L-aspartic acid residue and an L-lysine residue by an isopeptide bond with the formation of N6-(L-isoaspartyl)-L-lysine and the release of water. N(epsilon)-(beta-aspartyl)lysine N6-(L-isoaspartyl)-L-lysine MOD:01917 PSI-MOD none (2S)-2-amino-6-([(3S)-3-amino-3-carboxypropanoyl]amino)hexanoic acid N6-(L-isoaspartyl)-L-lysine crosslinked L-aspartic acid residue