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) 127.0997161865234375 127.18000030517578125 28.031299591064453125 28.049999237060546875 A protein modification that effectively converts an L-prolinium (charged L-proline) residue to N,N-dimethyl-L-proline. 1+ PSI-MOD C 2 H 4 N-term MOD:00889 MOD:00888 C 7 H 13 N 1 O 1 natural alpha-amino dimethylated residue