Aja viide. Aja lugu.

Lupan-3β,20-diol synthase (EC 4.2.1.128, LUP1 (gene)) is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene hydro-lyase (lupan-3beta,20-diol forming).^[1]^[2] This enzyme catalyses the following chemical reaction

lupan-3β,20-diol

\rightleftharpoons

(3S)-2,3-epoxy-2,3-dihydrosqualene + H₂O

The reaction occurs in the reverse direction.

References

^ Segura MJ, Meyer MM, Matsuda SP (July 2000). "Arabidopsis thaliana LUP1 converts oxidosqualene to multiple triterpene alcohols and a triterpene diol". Organic Letters. 2 (15): 2257–9. doi:10.1021/ol006016b. PMID 10930257.
^ Kushiro T, Hoshino M, Tsutsumi T, Kawai K, Shiro M, Shibuya M, Ebizuka Y (November 2006). "Stereochemical course in water addition during LUP1-catalyzed triterpene cyclization". Organic Letters. 8 (24): 5589–92. doi:10.1021/ol062310d. PMID 17107079.

Carbon–oxygen lyases (EC 4.2) (primarily dehydratases)
4.2.1: Hydro-Lyases	Carbonic anhydrase Fumarase Aconitase Enolase Alpha Enolase 2 Enoyl-CoA hydratase/3-Hydroxyacyl ACP dehydrase Methylglutaconyl-CoA hydratase Tryptophan synthase Cystathionine beta synthase Porphobilinogen synthase 3-Isopropylmalate dehydratase Urocanase Uroporphyrinogen III synthase Nitrile hydratase
4.2.2: Acting on polysaccharides	Hyaluronate lyase Pectin lyase
4.2.3: Acting on phosphates	Threonine synthase
4.2.99: Other	Carboxymethyloxysuccinate lyase Hydroperoxide lyase

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)