Even in solution only a single μ-carboxylato bridge links the metal centers in complex 1, according to EPR studies. This feature makes the complex an interesting structural model for the active center in enzymes that contain two manganese atoms. In D-xylose isomerase, for example, the manganese atoms are linked by a single bridging carboxylate(glutamate) residue.
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Adams et al. (1995) studied this question.