Primary Citation:Larsen, T. M., Wedekind, J. E., Rayment, I., Reed, G. H.: A carboxylate oxygen of the substrate bridges the magnesium ions at the active site of enolase: structure of the yeast enzyme complexed with the equilibrium mixture of 2-phosphoglycerate and phosphoenolpyruvate at 1.8 A resolution.. Biochemistry 35 pp. 4349 (1996)