Terpene cyclase-like protein flvF

UniProtKB accession:  B8NHE1

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Terpene cyclase-like protein; part of the gene cluster that mediates the biosynthesis of flavunoidine, an alkaloidal terpenoid with a tetracyclic cage-like core connected to dimethylcadaverine via a C-N bond and acylated with 5,5-dimethyl-L-pipecolate (PubMed:31885262). The tetracyclic core is synthesized by the terpene cyclase flvE and the cytochrome P450 monooxygenase flvD (PubMed:31885262). The terpene cyclase flvE catalyzes the cyclization of farnesyl pyrophosphate (FPP) to form (1R,4R,5S)-(+)-acoradiene and the cytochrome P450 monooxygenase flvD is then responsible for oxidative conversion of (1R,4R,5S)-(+)-acoradiene into the tetracyclic cage present in the final product flavunoidine (PubMed:31885262). In parallel, the N-methyltransferase flvH dimethylates L-lysine to give N,N-dimethyl-L-Lysin which is decarboxylated by flvG to afford dimethylcadaverine (PubMed:31885262). The terpene cyclase-like protein flvF is the enzyme that attaches the dimethylcadaverine precusor at the C-7 of the tetracyclic cage to yield pre-flavunoidine (PubMed:31885262). The cytochrome monooxygenase flvC hydroxylates the C-10 position of pre-flavunoidine whereas the NRPS flvI acylates the terpenoid core at the hydroxylated C-10 with dimethylpipecolate to yield final flavunoidine (PubMed:31885262). The bifunctional enzyme flvA and the dehydrogenase flvB are responsible for the synthesis of the dimethylpipecolate precursor (PubMed:31885262). The PLP-dependent lyase domain of flvA might use L-O-acetyl-homoserine and alpha-keto-isovalerate to form an intermediary ketone that can cyclize intramolecularly to yield an imine (PubMed:31885262). The imine can be reduced by flvB to yield the 6-carboxylated pipecolate (PubMed:31885262). The C-terminal alpha-KG-dependent oxygenase domain of flvA is then proposed to catalyze the decarboxylation to yield dimethylpipecolate (PubMed:31885262).