There are three families of enzymes having molybdenum at their active sites: the sulfite oxidase, xanthine oxidase, and DMSO reductase families.
a. Crystal structures of these enzymes show that in each case molybdenum is coordinated by a complex dithiolene ligand. What is the structure of this ligand, and what is it called?
b. Using sketches, show how the coordination environment of Mo is different in these three enzyme families.
c. What types of reactions do these enzymes catalyze? (See J. McMaster and J. H. Enemark, Curt: Opin. Chem. Bio., 1998, 2, 201; J. H. Enemark, J. J. A. Cooney, J.-J. Wang, and R. H. Holm, Chem. Rev., 2004, 104, 1175.)
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