(−)-alpha-terpineol synthase

{{Short description|Class of enzymes}}

{{Infobox enzyme

| Name = (−)-α-terpineol synthase

| EC_number = 4.2.3.111

| CAS_number =

| GO_code =

| image =

| width =

| caption =

}}

(−)-α-Terpineol synthase (EC 4.2.3.111) is an enzyme with systematic name geranyl-diphosphate diphosphate-lyase [cyclizing, (−)-α-terpineol-forming].{{cite journal | vauthors = Martin DM, Bohlmann J | title = Identification of Vitis vinifera (–)-α-terpineol synthase by in silico screening of full-length cDNA ESTs and functional characterization of recombinant terpene synthase | journal = Phytochemistry | volume = 65 | issue = 9 | pages = 1223–9 | date = May 2004 | pmid = 15184006 | doi = 10.1016/j.phytochem.2004.03.018 }}{{cite journal | vauthors = Lücker J, Bowen P, Bohlmann J | title = Vitis vinifera terpenoid cyclases: functional identification of two sesquiterpene synthase cDNAs encoding (+)-valencene synthase and (–)-germacrene D synthase and expression of mono- and sesquiterpene synthases in grapevine flowers and berries | journal = Phytochemistry | volume = 65 | issue = 19 | pages = 2649–59 | date = October 2004 | pmid = 15464152 | doi = 10.1016/j.phytochem.2004.08.017 }} This enzyme catalyses the following chemical reaction

: geranyl diphosphate + H₂O $\backslash rightleftharpoons$ (−)-α-terpineol + diphosphate

The enzyme has been characterized from Vitis vinifera (grape).