(E)-3-(methoxycarbonyl)pent-2-enedioate + S-adenosyl-L-homocysteine => trans-aconitate + S-adenosyl-L-methionine
(e)-3-(methoxycarbonyl)pent-2-enedioate + s-adenosyl-l-homocysteine => trans-aconitate + s-adenosyl-l-methionine