Journal
ORGANIC LETTERS
Volume 5, Issue 8, Pages 1277-1280Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol0300165
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{GRAPHICS] In the chalcone synthase (CHS) enzyme reaction, both the starter molecule and the extension unit of the poyketide chain elongation reaction were simultaneously replaced with nonphysiological substrates. When incubated with benzoyl-CoA and methylmalonyl-CoA as substrates, recombinant CHS from Scutellaria baicalensis afforded an unnatural novel triketide, 4-hydroxy-3,5-dimethyl-6-phenyl-pyran-2-one, along with a tetraketide, 4-hydroxy-3,5-dimethyl-6-(1-methyl-2-oxo-2-phenyl-ethyl)-pyran-2-one. On the other hand, the enzyme also accepted hexanoyl-CoA and methylmalonyl-CoA as substrates to produce an unnatural novel triketide, 4-hydroxy-3,5-dimethyl-6-pentyl-pyran-2-one.
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