5alpha-hydroxysteroid dehydratase

This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is 5alpha-ergosta-7,22-diene-3beta,5-diol 5,6-hydro-lyase (ergosterol-forming). This enzyme is also called 5alpha-ergosta-7,22-diene-3beta,5-diol 5,6-hydro-lyase.

References

Topham RW, Gaylor JL (1970). "Isolation and purification of a 5 alpha-hydroxysterol dehydrase of yeast". J. Biol. Chem. 245 (9): 2319–27. PMID 5442273.

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

Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor
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)

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