1.2- Dithiolenes pterin redox reactions

The third recurring structural motif with non-amino-acid components found in metalloproteins is the metal-dithiolene unit found in molybdenum- and tungsten-containing oxidases or dehydrogenases (see Chapter 8.18). The dithiolene is typically a pterin derivative (often with phosphate and/or nucleotide appendages) and coordinated to Mo or W in a 1 1 or 2 1 stoichiometry (Figure 7)." These units usually function in two-electron redox reactions (cf 0x0 transfer ), shuttling between... 

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