O-(ADP-ribosyl)-L-serine 541.06109619140625 541.29998779296875 628.0931396484375 628.3800048828125 PSI-MOD none O-(ADP-ribosyl)-L-serine C 18 H 26 N 6 O 15 P 2 S ADP Ribose addition MOD_RES ADP-ribosylserine (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-propanoic acid O3-(ADP-ribosyl)-L-serine ADP-Ribosyl MOD:00242 O3-alpha-D-ribofuranosyl-L-serine 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate) OADPRibSer A protein modification that effectively converts an L-serine residue to O-(ADP-ribosyl)-L-serine. C 15 H 21 N 5 O 13 P 2 natural O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-serine monoadenosine diphosphoribosyl (ADP-ribosyl) modified residue modified L-serine residue