modified L-glutamic acid residue N2-(L-isoglutamyl)-L-lysine (2S)-6-amino-2-([(4S)-4-amino-4-carboxybutanoyl]amino)hexanoic acid 128.0949554443359375 128.17999267578125 257.137542724609375 257.290008544921875 5-glutamyl N2-lysine A protein modification that effectively converts an L-glutamic acid residue to N2-(L-isoglutamyl)-L-lysine. This is not an isopeptide cross-link. C 11 H 19 N 3 O 4 C 6 H 12 N 2 O 1 E MOD:01608 MOD_RES 5-glutamyl N2-lysine N2-(L-isoglutamyl)-L-lysine N2-(gamma-glutamyl)lysine PSI-MOD alpha-(gamma-glutamyl)lysine gamma-glutamyl N2-lysine natural uniprot.ptm:PTM-0407