Purification and properties of 3-hexulose phosphate synthase and phospho-3-hexuloisomerase from Methylococcus capsulatus

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Abstract
3-Hexulose phosphate synthase and phospho-3-hexuloisomerase were purified 40- and 150-fold respectively from methane-grown Methylococcus capsulatus. The molecular weights of the enzymes were approximately 310000 and 67000 respectively, as determined by gel filtration. Dissociation of 3-hexulose phosphate synthase into subunits of molecular weight approx. 49000 under conditions of low pH or low ionic strength was observed. Within the range of compounds tested, 3-hexulose phosphate synthase is specific for formaldehyde and d-ribulose 5-phosphate (forward reaction) and d-arabino-3-hexulose 6-phosphate (reverse reaction), and phospho-3-hexuloisomerase is specific for d-arabino-3-hexulose 6-phosphate (forward reaction) and d-fructose 6-phosphate (reverse reaction). A bivalent cation is essential for activity and stability of 3-hexulose phosphate synthase; phospho-3-hexuloisomerase is inhibited by many bivalent cations. The pH optima of the two enzymes are 7.0 and 8.3 respectively and the equilibrium constants are 4.0×10-5m and 1.9×102m respectively. The apparent Michaelis constants for 3-hexulose phosphate synthase are: d-ribulose 5-phosphate, 8.3×10-5m; formaldehyde, 4.9×10-4m; d-arabino-3-hexulose 6-phosphate, 7.5×10-5m. The apparent Michaelis constants for phospho-3-hexuloisomerase are: d-arabino-3-hexulose 6-phosphate, 1.0×10-4m; d-fructose 6-phosphate, 1.1×10-3m.