L-methionyl-[protein] + S-adenosyl-L-methionine => S-methyl-L-methionyl-[protein] + S-adenosyl-L-homocysteine
l-methionyl-[protein] + s-adenosyl-l-methionine => s-methyl-l-methionyl-[protein] + s-adenosyl-l-homocysteine