Active site residues governing substrate selectivity and polyketide chain length in aloesone synthase.


Aloesone synthase (ALS) and chalcone synthase (CHS) are plant-specific type III poyketide synthases sharing 62% amino acid sequence identity. ALS selects acetyl-CoA as a starter and carries out six successive condensations with malonyl-CoA to produce a heptaketide aloesone, whereas CHS catalyses condensations of 4-coumaroyl-CoA with three malonyl-CoAs to… (More)


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