label: N-terminal N,N-dimethyl-L-prolyl-L-prolyl-L-lysyl-[protein] + 2 S-adenosyl-L-homocysteine + 2 H(+) => N-terminal L-prolyl-L-prolyl-L-lysyl-[protein] + 2 S-adenosyl-L-methionine
label_lc: n-terminal n,n-dimethyl-l-prolyl-l-prolyl-l-lysyl-[protein] + 2 s-adenosyl-l-homocysteine + 2 h(+) => n-terminal l-prolyl-l-prolyl-l-lysyl-[protein] + 2 s-adenosyl-l-methionine