Dissociation of hexameric Escherichia coli inorganic pyrophosphatase into trimers on His-136-->Gln or His-140-->Gln substitution and its effect on enzyme catalytic properties.

Dissociation of hexameric Escherichia coli inorganic pyrophosphatase into trimers on His-136-->Gln or His-140-->Gln substitution and its effect on enzyme catalytic properties.