5-epi-aristolochene synthase

UniProtKB accession:  Q40577

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UniProtKB description:  Catalyzes the cyclization of trans,trans-farnesyl diphosphate (FPP) to the bicyclic intermediate 5-epi-aristolochene, initial step in the conversion of FPP to the sesquiterpenoid antifungal phytoalexin capsidiol (PubMed:16375847, PubMed:20175559, PubMed:20201526, Ref.3). Produces germacrene A as an enzyme-bound intermediate that is not released by the enzyme, but is further cyclized to produce the bicyclic 5-epi-aristolochene (PubMed:16375847, PubMed:20175559, Ref.3). Mediates, at low levels, the formation of 4-epi-eremophilene and premnaspirodiene from trans,trans-farnesyl diphosphate (PubMed:20175559). Mediates also the conversion of cis,trans-farnesyl diphosphate to cisoid minor products such as (+)-2-epi-prezizaene, (-)-alpha-cedrene and, to a lesser extent, (-)-beta-curcumene; produces also at low levels alpha-acoradiene and 4-epi-alpha-acoradiene, but barely nerolidol, alpha-bisabolol, epi-alpha-bisabolol and cis-farnesol (PubMed:20175559, PubMed:20201526).