4.2.3.22 ? x * 40000, recombinant enzyme, SDS-PAGE -, 663198 4.2.3.22 additional information the recombinant N-terminal half of the protein catalyzes the Mg2+-dependent cyclization of farnesyl diphosphate to germacradienol and germacrene D, while the highly homologous C-terminal domain catalyzes the Mg2+-dependent conversion of germacradienol to geosmin 716305