Experiments on the YhhW protein show that is has quercetinase activity. This entry represents the C-terminal cupin domain from the two cupin domains that make up the protein [1]. This domain is usually associated with Pfam:PF02678.

1: Structural and biochemical analysis reveal pirins to possess quercetinase activity. Adams M, Jia Z; J Biol Chem. 2005;280:28675-28682. PMID:15951572

2: The crystal structure of the protein YhaK from Escherichia coli reveals a new subclass of redox sensitive enterobacterial bicupins. Gurmu D, Lu J, Johnson KA, Nordlund P, Holmgren A, Erlandsen H; Proteins. 2009;74:18-31. PMID:18561187