ID   2.5.1.103
DE   presqualene diphosphate synthase.
CA   2 (2E,6E)-farnesyl diphosphate = diphosphate + presqualene diphosphate.
CC   -!- Isolated from the green alga Botryococcus braunii BOT22.
CC   -!- Unlike EC 2.5.1.21, where squalene is formed in one step from
CC       farnesyl diphosphate, in this alga the intermediate presqualene
CC       diphosphate is generated and released by this enzyme.
CC   -!- This compound is then converted into either squalene (by EC 1.3.1.96)
CC       or botryococcene (EC 1.3.1.97).
DR   Q6N3F2, HPND_RHOPA ;  P55350, HPND_SINFN ;  H2VFR7, HPND_ZYMMO ;
DR   G0Y286, PSDS_BOTBR ;
//