NADP-dependent quinone oxidoreductases (<db_xref db="EC" dbkey="1.6.5.5"/>) are part of the zinc-containing alcohol dehydrogenase family of enzymes. <p> The NADP-dependent quinone oxidoreductase (<db_xref db="EC" dbkey="1.6.5.5"/>) is found in bacteria (gene qor), in yeast and in mammals where, in somespecies such as rodents, it has been recruited as an eye lens protein and isknown as zeta-crystallin [<cite idref="PUB00001655"/>]. The sequence of quinone oxidoreductase isdistantly related to that other zinc-containing alcohol dehydrogenases and itlacks the zinc-ligand residues. The Torpedo fish and mammalian synaptic vesiclemembrane protein vat-1 is related to qor.</p> Quinone oxidoreductase/zeta-crystallin, conserved site