O-phospho-L-serine 166.99835205078125 167.05999755859375 79.96633148193359375 79.98000335693359375 MOD:00046 O3-phosphoserine MOD_RES Phosphoserine ACT_SITE Phosphoserine intermediate S none natural Phospho PSI-MOD 2-amino-3-hydroxypropanoic acid 3-phosphate O-phospho-L-serine H 1 O 3 P 1 serine phosphate ester Phosphorylation O-phosphonoserine A protein modification that effectively converts an L-serine residue to O-phospho-L-serine. O-phosphorylated L-serine phosphorylations Phospho Seryl (2S)-2-amino-3-(phosphonooxy)propanoic acid 2-azanyl-3-(phosphonooxy)propanoic acid C 3 H 6 N 1 O 5 P 1 OPSer modified L-serine residue O-phosphorylated residue