4-methyl-2-oxopentanoate + S-adenosyl-L-methionine => (3R)-3,4-dimethyl-2-oxopentanoate + S-adenosyl-L-homocysteine + H(+)
4-methyl-2-oxopentanoate + s-adenosyl-l-methionine => (3r)-3,4-dimethyl-2-oxopentanoate + s-adenosyl-l-homocysteine + h(+)
4-methyl-2-oxopentanoate + S-adenosyl-L-methionine => (3R)-3,4-dimethyl-2-oxopentanoate + S-adenosyl-L-homocysteine + H(+)
4-methyl-2-oxopentanoate + s-adenosyl-l-methionine => (3r)-3,4-dimethyl-2-oxopentanoate + s-adenosyl-l-homocysteine + h(+)