monoadenosine diphosphoribosyl (ADP-ribosyl) modified residue modified L-threonine residue O-(ADP-ribosyl)-L-threonine 541.06109619140625 541.29998779296875 642.1087646484375 642.4000244140625 C 19 H 28 N 6 O 15 P 2 O3-(ADP-ribosyl)-L-threonine MOD:01663 natural C 15 H 21 N 5 O 13 P 2 A protein modification that effectively converts an L-threonine residue to O-(ADP-ribosyl)-L-threonine. PSI-MOD O-(ADP-ribosyl)-L-threonine O3-alpha-D-ribofuranosyl-L-threonine 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate) T O3-[alpha-D-ribofuranoside 5'->5'-ester with adenosine 5'-(trihydrogen diphosphate)]-L-threonine none (S)-2-amino-3-([adenosine 5'-(trihydrogen diphosphate) 5'->5'-ester with alpha-D-ribofuranosyl]oxy)-butanoic acid