ID 4.1.99.16 DE geosmin synthase. CA (1E,4S,5E,7R)-germacra-1(10),5-dien-11-ol + H2O = (-)-geosmin + acetone. CC -!- Geosmin is the cause of the characteristic smell of moist soil. CC -!- It is a bifunctional enzyme. CC -!- The N-terminal part of the enzyme is EC 4.2.3.22, germacradienol CC synthase, and forms germacradienol from FPP. CC -!- The C-terminal part of the enzyme catalyzes the conversion of CC germacradienol to geosmin via (1S,4aS,8aS)-8,10-dimethyl- CC 1,2,3,4,4a,5,6,8a-octahydronaphthalene. DR Q9X839, CYC2_STRCO ; //