Methylornithine synthase (EC 5.4.99.58, PylB) is an enzyme with systematic name L-lysine carboxy-aminomethylmutase.
[1][2] This enzyme catalyses the conversion of L-lysine into (3R)-3-methyl-D-ornithine.
The enzyme is a member of the superfamily of S-adenosyl-L-methionine-dependent radical enzymes.