Involved in the production of itaconic acid, a soluble unsaturated dicarboxylic acid mainly produced from sugars. cis-aconitate + H(+) = CO2 + itaconate A.terreus has been used for the industrial production of itaconic acid because of its high production rate. Itaconic acid is used as a monomer to form polymers that are widely used as raw materials for latex, synthetic resins, adhesives, paint, and additives for acrylic resin fibers and paper. It is also used as an acidulant and for the pH adjustment of foods. Belongs to the PrpD family.