derives from N,N-dimethyl-L-proline protonated-dimethylated residue methylated proline protonated L-proline (L-prolinium) residue N,N-dimethyl-L-proline (from L-prolinium) 1+ 127.0991668701171875 127.19000244140625 28.030752182006835938 28.049999237060546875 A protein modification that effectively converts an L-prolinium (charged L-proline) residue to N,N-dimethyl-L-proline. C 2 H 4 N 0 O 0 C 7 H 13 N 1 O 1 MOD:00888 MOD:00889 N-term PSI-MOD Unimod:36 natural alpha-amino dimethylated residue