glutamyl semialdehyde (Arg) -43.053432464599609375 -43.06999969482421875 113.04767608642578125 113.12000274658203125 A protein modification that effectively converts an L-arginine residue to L-glutamyl semialdehyde. Arg->GluSA Arginine oxidation to glutamic semialdehyde C -1 H -5 N -3 O 1 C 5 H 7 N 1 O 2 From DeltaMass: Average Mass: -27 Monoisotopic Mass Change:-27.06 Average Mass Change:-27.07 References:Amici A, Levine, RL, Tsai, L, and Stadtman, ER: Conversion of amino acid residues in proteins and amino acid homopolymers to carbonyl derivatives by metal-catalyzed oxidation reactions. Journal of Biological Chemistry 264: 3341-3346 1989.Requena JR, Chao CC, Levine RL, and Stadtman ER: Glutamic and aminoadipic semialdehydes are the main carbonyl products of metal-catalyzed oxidation of proteins. Proceedings of the National Academy of Sciences USA 98: 69-74 2001. MOD:00479 Oxidation of arginine (to glutamic acid) PSI-MOD R Unimod:344 artifact modified L-arginine residue glutamyl semialdehyde