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Inorganic pyrophosphatase and nucleoside diphosphatase in the parasitic protozoon, Entamoeba histolytica.
Authors:J McLaughlin  D G Lindmark  M Müller
Affiliation:The Rockefeller University, New York, N.Y. 10021 USA
Abstract:Entamoeba histolytica contains two acid pyrophosphatases. One is an inorganic pyrophosphatase with a relatively high Km ( ? 1 mM) and no cation requirement. The other is a nucleoside diphosphatase with a relatively low Km ( ? 50 μM) and Ca2+ requirement. No Mg2+ dependent neutral or alkaline inorganic pyrophosphatase is present. The pyrophosphatases are localized in subcellular particles, display structure-linked latency and are tightly bound to membranes.
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