Abstract
A specific nucleoside diphosphatase was purified from the plant portion of soybean (Glycine max L.) root nodules. This enzyme is highly specific for nucleotide diphosphates; it is unable to hydrolyze nucleotide tri- and monophosphates or a variety of other phosphorylated compounds. It will, however, hydrolyze any nucleotide disphosphate tested. The pH optimum of the enzyme is about 7.5; it requires a divalent cation for activity; and it is neither inhibited nor activated by any of the metabolites tested. It appears that in vivo this enzyme would be very active, but its function is not clear.
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