. "Catalysis of the reaction: S-adenosyl-L-methionine(1+) = S-methyl-5'-thioadenosine + homoserine lactone." . . "adenosylmethionine cyclotransferase activity" . "adenosyl methionine cyclotransferase activity" . "adenosylmethioninase activity" . "S-adenosyl-L-methionine alkyltransferase (cyclizing)" . . .