N6-propylamino-poly(propylmethylamino)-propyldimethylamine-L-lysine (alpha)- ([([(5S)-5-amino-5-carboxypentyl]amino)propyl][(methyl)amino])-(omega)-methyl poly[propane-1,3-diyl(methylimino)] A protein modification that effectively converts an L-lysine residue to an N6-propylamino-poly(propylmethylamino)-propyldimethylamine-L-lysine. K MOD:00283 MOD_RES N6-poly(methylaminopropyl)lysine N6-[3-([(omega)-(dimethyl)aminopropyl-poly(3-[methylamino]propyl)]amino)propyl]lysine N6-propylamino-poly(propylmethylamino)-propyldimethylamine-L-lysine PSI-MOD lysine derivative Lys(x) natural silaffin polycationic lysine derivative uniprot.ptm:PTM-0198 modified L-lysine residue