L-aspartic 4-phosphoric anhydride (2S)-2-amino-4-oxo-4-(phosphonooxy)butanoic acid 194.9932708740234375 195.07000732421875 2-aminobutanedioic 4-phosphoric anhydride 2-azanyl-4-oxo-4-(phosphonooxy)butanoic acid 4-oxo-O-phosphono-L-homoserine 4-phosphoaspartic acid 4-phosphorylated L-aspartatic acid 79.96633148193359375 79.98000335693359375 A protein modification that effectively converts an L-aspartic acid residue to L-aspartic 4-phosphoric anhydride. ACT_SITE 4-aspartylphosphate intermediate C 0 H 1 N 0 O 3 P 1 C 4 H 6 N 1 O 6 P 1 D L-aspartic 4-phosphoric anhydride MOD:00042 MOD_RES 4-aspartylphosphate PAsp PSI-MOD Phospho Phosphorylation Unimod:21 beta-aspartyl phosphate natural uniprot.ptm:PTM-0038 modified L-aspartic acid residue O-phosphorylated residue