O-(ADP-ribosyl)-L-serine (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-propanoic acid 541.06109619140625 541.29998779296875 628.0931396484375 628.3800048828125 A protein modification that effectively converts an L-serine residue to O-(ADP-ribosyl)-L-serine. ADP Ribose addition ADP-Ribosyl C 15 H 21 N 5 O 13 P 2 C 18 H 26 N 6 O 15 P 2 MOD:00242 MOD_RES ADP-ribosylserine O-(ADP-ribosyl)-L-serine O3-(ADP-ribosyl)-L-serine O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-serine O3-alpha-D-ribofuranosyl-L-serine 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate) OADPRibSer PSI-MOD S Unimod:213 natural uniprot.ptm:PTM-0056 monoadenosine diphosphoribosyl (ADP-ribosyl) modified residue modified L-serine residue