Oxalate oxidoreductase
Oxalate oxidoreductases are a relatively recently discovered group of enzymes that break down oxalate, a problematic molecule nutritionally. The first one to have been characterized has the systematic name oxalate:ferredoxin oxidoreductase. This enzyme catalyses the following chemical reaction:
The enzyme is known to contain thiamine diphosphate and iron–sulfur clusters.
Another OOR from acetogenic bacteria, a thiamine pyrophosphate -dependent OOR, had its mechanism of action decoded step by step under X-ray crystallography to rather simplistically split oxalate, producing low-potential electrons and CO2.