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EC Number General Information Commentary Reference
Display the reaction diagram Show all sequences 4.2.1.B20metabolism onoceroids are triterpenoids biosynthesized from squalene or (3S)-2,3-oxidosqualene by cyclization from both termini 729891
Display the reaction diagram Show all sequences 4.2.1.B20physiological function ferns are known to produce onoceroids including onoceranes and serratanes having unusual structures among triterpenes. Serratanes are directly biosynthesized from pre-alpha-onocerin and not from alpha-onocerin as previously assumed 743390
Display the reaction diagram Show all sequences 4.2.1.B20physiological function onoceroids are a group of triterpenes biosynthesized from squalene or dioxidosqualene by cyclization from both termini. The bifunctional triterpene/sesquarterpene (TC) constructs a tetracyclic scaffold from tetraprenyl-beta-curcumene (C35) but a bicyclic scaffold from squalene (C30) in the first reaction. The enzyme also accepts the bicyclic intermediate as a substrate and generates tetracyclic and pentacyclic onoceroids in the second reaction, catalytic mechanism of an onoceroid synthase, overview. The bulk size at Y167 contributes to termination of the cyclization of squalene at the bicyclic step 747544
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