Partial Purification and Properties of a Highly Specific Trehalose Phosphate Phosphatase from Mycobacterium smegmatis

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Abstract
A specific trehalose phosphate phosphatase was purified approximately 50-fold from Mycobacterium smegmatis. The enzyme had a pH optimum of about 7.0 and was stimulated by Mg(2+). The optimum concentration of Mg(2+) was about 1.5 x 10(-3)m. Of other divalent cations tested, only Co(2+) showed some activity. The K(m) for trehalose phosphate was found to be about 1.5 x 10(-3)m. The enzyme showed slight activity toward mannose-6-P and fructose-6-P but was inactive on a large number of other phosphorylated compounds. Citrate was a competitive inhibitor of the enzyme both with respect to trehalose phosphate concentration and Mg(2+) concentration. This inhibition appears to be due to chelation of Mg(2+) by this compound. Ethylenediaminetetraacetic acid and NaF were also inhibitors of the enzyme, but these inhibitions were noncompetitive.

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