Archaeal tungsten enzymes

There are only a few reports in which XAS has been applied to the archaeal tungsten enzymes, but nevertheless the technique has proved important. Just as molybdenum is the only second-transition element to have a function in biology, tungsten is the only third-transition element and also the heaviest element that is known to have a function in biology. Tungsten has a very similar chemistry to molybdenum and a detailed review of the comparative chemistry of the two elements has recently been reported. " The redox couples relating the... 

---