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FSR1 | Non-reducing polyketide synthase fsr1; Non-reducing polyketide synthase; part of the gene cluster that mediates the biosynthesis of fusarubins, highly pigmented naphthoquinones responsible for the coloration of the fruiting bodies. The non-reducing polyketide synthase FSR1 is responsible for the condensation of seven acetyl-CoA units to yield a haptaketide. After rings A and B are formed by aldol-type cyclization, the PKS-derived product is released as 6-O-demethylfusarubinaldehyde. Then, two hydroxyl groups at C-5 and C-10 are incorporated by FSR3, and simultaneously hydroxyl groups a [...] (2286 aa) | ||||
FUB8 | Non-canonical non-ribosomal peptide synthetase FUB8; Non-canonical non-ribosomal peptide synthetase; part of the gene cluster that mediates the biosynthesis of fusaric acid, a mycotoxin with low to moderate toxicity to animals and humans, but with high phytotoxic properties. L-aspartate is suggested as fusaric acid amino acid precursor that is activated and further processed to O-acetyl-L-homoserine by cluster enzymes aspartate kinase FUB3 and homoserine O-acetyltransferase FUB5, as well as enzymes of the primary metabolism. The polyketide synthase (PKS) FUB1 generates the triketide tr [...] (1036 aa) | ||||
bik1 | Bikaverin polyketide synthase bik1; Polyketide synthase; part of the gene cluster that mediates the biosynthesis of bikaverin, a red pigment also considered as a mycotoxin. The first stage is catalyzed by the polyketide synthase bik1, which catalyzes the formation of the intermediate SMA76a also knowm as pre- bikaverin. FAD- dependent monooxygenase bik2 might then be responsible for the oxidation of pre-bikaverin to oxo-pre-bikaverin which is in turn methylated by the O-methyltransferase bik3 to me-oxo-pre-bikaverin. A further cycle of oxydation and methylation by bik2 and bik3 leads t [...] (2036 aa) |