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- W2001262372 abstract "A gene putatively identified as the Archaeoglobus fulgidus inositol-1-phosphate synthase (IPS) gene was overexpressed to high level (about 30-40% of total soluble cellular proteins) in Escherichia coli. The recombinant protein was purified to homogeneity by heat treatment followed by two column chromatographic steps. The native enzyme was a tetramer of 168 +/- 4 kDa (subunit molecular mass of 44 kDa). At 90 degrees C the K(m) values for glucose-6-phosphate and NAD(+) were estimated as 0.12 +/- 0.04 mM and 5.1 +/- 0.9 microM, respectively. Use of (D)-[5-(13)C]glucose-6-phosphate as a substrate confirmed that the stereochemistry of the product of the IPS reaction was L-myo-inositol-1-phosphate. This archaeal enzyme, with the highest activity at its optimum growth temperature among all IPS reported (k(cat) = 9.6 +/- 0.4 s(-1) with an estimated activation energy of 69 kJ/mol), was extremely heat stable. However, the most unique feature of A. fulgidus IPS was that it absolutely required divalent metal ions for activity. Zn(2+) and Mn(2+) were the best activators with K(D) approximately 1 microM, while NH(4)(+) (a critical activator for all the other characterized IPS enzymes) had no effect on the enzyme. These properties suggested that this archaeal IPS was a class II aldolase. In support of this, stoichiometric reduction of NAD(+) to NADH could be followed spectrophotometrically when EDTA was present along with glucose-6-phosphate." @default.
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- W2001262372 date "2000-09-15" @default.
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- W2001262372 title "Inositol-1-phosphate Synthase from <i>Archaeoglobus fulgidus </i>Is a Class II Aldolase" @default.
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- W2001262372 doi "https://doi.org/10.1021/bi001517q" @default.
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