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- W2078665241 abstract "A cDNA clone encoding amorpha-4,11-diene synthase from Artemisia annua was subcloned into a bacterial expression vector in frame with a His6-tag. Recombinant amorpha-4,11-diene synthase was produced in Escherichia coli and purified to apparent homogeneity. The enzyme showed pH optimum at pH 6.5, and a minimum at pH 7.5. Substantial activity was observed in the presence of Mg2+, Mn2+ or Co2+ as cofactor. The enzyme exhibits a low activity in the presence of Ni2+ and essentially no activity with Cu2+ or Zn2+. The sesquiterpenoids produced from farnesyl diphosphate in the presence of Mg2+ were analyzed by GC-MS. In addition to amorpha-4,11-diene, 15 sesquiterpenoids were produced. Only small quantitative differences in product pattern were observed at pH 6.5, 7.5, or 9.5. Amorpha-4,11-diene synthase showed significant increased product selectivity in the presence of Mn2+ or Co2+. Km for farnesyl diphosphate was 3.3, 8.0, and 0.7 microM in the presence of Mg2+, Mn2+ or Co2+, respectively. The corresponding kcat-values were 6.8, 15.0, and 1.3 x 10(-3) s(-1), respectively. Km and kcat for geranyl diphosphate were 16.9 microM and 7.0 x 10(-4) s(-1), respectively, at pH 6.5, in the presence of Mn2+." @default.
- W2078665241 created "2016-06-24" @default.
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- W2078665241 date "2005-04-01" @default.
- W2078665241 modified "2023-10-11" @default.
- W2078665241 title "Expression, purification, and characterization of recombinant amorpha-4,11-diene synthase from Artemisia annua L." @default.
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- W2078665241 doi "https://doi.org/10.1016/j.abb.2005.02.012" @default.
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