:(S)-beta-macrocarpene synthase

{{Short description|Class of enzymes}}

{{Infobox enzyme

| Name = (S)-β-Macrocarpene synthase

| EC_number = 5.5.1.17

| CAS_number =

| GO_code =

| image =

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(S)-β-macrocarpene synthase ({{EnzExplorer|5.5.1.17}}, TPS6, TPS11) is an enzyme with systematic name (S)-β-macrocarpene lyase (decyclizing).{{cite journal | vauthors = Köllner TG, Schnee C, Li S, Svatos A, Schneider B, Gershenzon J, Degenhardt J | title = Protonation of a neutral (S)-beta-bisabolene intermediate is involved in (S)-β-macrocarpene formation by the maize sesquiterpene synthases TPS6 and TPS11 | journal = The Journal of Biological Chemistry | volume = 283 | issue = 30 | pages = 20779–88 | date = July 2008 | pmid = 18524777 | pmc = 3258946 | doi = 10.1074/jbc.m802682200 | doi-access = free }} This enzyme catalyses the following chemical reaction

: (S)-β-bisabolene $\backslash rightleftharpoons$ (S)-β-macrocarpene

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