The Enzyme Database

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EC 4.2.1.124     
Accepted name: arabidiol synthase
Reaction: arabidiol = (3S)-2,3-epoxy-2,3-dihydrosqualene + H2O
For diagram of arabidiol, camellidiol and thalianol biosynthesis, click here
Glossary: arabidiol = (13R)-malabarica-17,21-diene-3β,14-diol
Other name(s): PEN1 (gene name); (S)-squalene-2,3-epoxide hydro-lyase (arabidiol forming)
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene hydro-lyase (arabidiol forming)
Comments: The reaction occurs in the reverse direction.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Xiang, T., Shibuya, M., Katsube, Y., Tsutsumi, T., Otsuka, M., Zhang, H., Masuda, K. and Ebizuka, Y. A new triterpene synthase from Arabidopsis thaliana produces a tricyclic triterpene with two hydroxyl groups. Org. Lett. 8 (2006) 2835–2838. [DOI] [PMID: 16774269]
[EC 4.2.1.124 created 2011]
 
 
EC 5.4.99.53     
Accepted name: marneral synthase
Reaction: (3S)-2,3-epoxy-2,3-dihydrosqualene = marneral
For diagram of arabidiol, camellidiol and thalianol biosynthesis, click here
Systematic name: (3S)-2,3-epoxy-2,3-dihydrosqualene mutase (cyclizing, marneral-forming)
Comments: Marneral is a triterpenoid formed by Grob fragmentation of the A ring of 2,3-epoxy-2,3-dihydrosqualene during cyclization.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Xiong, Q., Wilson, W.K. and Matsuda, S.P.T. An Arabidopsis oxidosqualene cyclase catalyzes iridal skeleton formation by Grob fragmentation. Angew. Chem. Int. Ed. Engl. 45 (2006) 1285–1288. [DOI] [PMID: 16425307]
[EC 5.4.99.53 created 2011]
 
 


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