the dissociation of the tetrameric enzyme and association of monomeric enzyme to dimeric forms occurs during catalysis of the forward reaction, caused by the product oxaloacetate, or by malate or fumarate. The monomeric form and the dimeric form are less active than the tetrameric enzyme form
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overexpression in Escherichia coli K-12 has no effect on succinate fermentation. In phosphoenolpyruvate carboxylase mutant strain of Escherichia coli K-12 (ppc::kan), PEPCK overexpression increases succinate production 6.5fold