ID 4.2.3.7 DE pentalenene synthase. AN pentalenene synthetase. CA (2E,6E)-farnesyl diphosphate = diphosphate + pentalenene. CC -!- Isolated from Streptomyces avermitilis. CC -!- The enzyme is involved in the biosynthesis of pentalenolactone and CC related antibiotics. CC -!- The 9si hydrogen of farnesyl diphosphate undergoes a 1,2-hydride CC shift where it becomes the 1alpha hydrogen of pentalenene. CC -!- Formerly EC 4.6.1.5. DR Q55012, PENA_STREX ; E3VWJ0, PNTA_STRAE ; Q82IY4, PTLA_STRAW ; DR A0A348B788, STS14_POSPM; //