Shionone synthase

Shionone synthase (EC 5.4.99.46) is an enzyme with systematic name (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, shionone-forming).^[1] This enzyme catalyses the following chemical reaction

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

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shionone

The enzyme gives traces of four other triterpenoids

References

↑ Sawai, S.; Uchiyama, H.; Mizuno, S.; Aoki, T.; Akashi, T.; Ayabe, S.; Takahashi, T. (2011). "Molecular characterization of an oxidosqualene cyclase that yields shionone, a unique tetracyclic triterpene ketone of Aster tataricus". FEBS Lett. 585: 1031–1036. doi:10.1016/j.febslet.2011.02.037. PMID 21377465.

Shionone synthase at the US National Library of Medicine Medical Subject Headings (MeSH)

Isomerase: mutases (EC 5.4)

5.4.1 Acyl Groups	Lysolecithin acylmutase Precorrin-8X methylmutase

5.4.2 Phosphomutases	Phosphoglycerate mutase Bisphosphoglycerate mutase Phosphoglucomutase Phosphomannomutase PMM1 PMM2

5.4.99 Other groups	Methylmalonyl-CoA mutase Lanosterol synthase

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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