:(S)-beta-bisabolene synthase

{{Short description|Class of enzymes}}

{{Infobox enzyme

| Name = (S)-β-bisabolene synthase

| EC_number = 4.2.3.55

| CAS_number =

| GO_code =

| image =

| width =

| caption =

}}

(S)-β-bisabolene synthase (EC 4.2.3.55) is an enzyme with systematic name (2E,6E)-farnesyl-diphosphate diphosphate-lyase ((S)-β-bisabolene-forming).{{cite journal | vauthors = Fujisawa M, Harada H, Kenmoku H, Mizutani S, Misawa N | title = Cloning and characterization of a novel gene that encodes (S)-beta-bisabolene synthase from ginger, Zingiber officinale | journal = Planta | volume = 232 | issue = 1 | pages = 121–30 | date = June 2010 | pmid = 20229191 | doi = 10.1007/s00425-010-1137-6 | s2cid = 2842560 }} This enzyme catalyses the following chemical reaction

: (2E,6E)-farnesyl diphosphate $\backslash rightleftharpoons$ (S)-β-bisabolene + diphosphate

The synthesis of (S)-β-macrocarpene from (2E,6E)-farnesyl diphosphate proceeds in two steps.