Alpha-humulene synthase

Alpha-humulene synthase (EC 4.2.3.104, ZSS1) is an enzyme with systematic name (2E,6E)-farnesyl-diphosphate diphosphate-lyase (alpha-humulene-forming).^[1] This enzyme catalyses the following chemical reaction:

\rightleftharpoons

alpha-humulene + diphosphate

The enzyme from Zingiber zerumbet, shampoo ginger, also gives traces of β-caryophyllene.

References[]

^ Yu F, Okamto S, Nakasone K, Adachi K, Matsuda S, Harada H, Misawa N, Utsumi R (May 2008). "Molecular cloning and functional characterization of alpha-humulene synthase, a possible key enzyme of zerumbone biosynthesis in shampoo ginger (Zingiber zerumbet Smith)". Planta. 227 (6): 1291–9. doi:10.1007/s00425-008-0700-x. PMID 18273640. S2CID 21079702.

v t 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
4.2.3: Acting on phosphates	Threonine synthase
4.2.99: Other	Carboxymethyloxysuccinate lyase Hydroperoxide lyase

v t Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Coenzyme 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)