<p>This entry is found in FAD-binding domains consisting of two alpha+beta subdomains. It represents the second (C-terminal) 2-layer alpha/beta subdomain, which is found in:</p><p> <ul> <li>CO dehydrogenase flavoprotein (N-terminal domain; [<cite idref="PUB00036706"/>]) family, which includes xanthine oxidase (domain 3) (<db_xref db="EC" dbkey="1.17.3.2"/>) [<cite idref="PUB00032033"/>], subunit A of xanthine dehydrogenase (domain 3) (<db_xref db="EC" dbkey="1.17.1.4"/>) [<cite idref="PUB00026513"/>], medium subunit of quinoline 2-oxidoreductase (QorM) (<db_xref db="EC" dbkey="1.3.99.17"/>) [<cite idref="PUB00031318"/>], and the beta-subunit of 4-hydroxybenzoyl-CoA reductase (HrcB) (N-terminal domain) (<db_xref db="EC" dbkey="1.3.99.20"/>) [<cite idref="PUB00030724"/>].</li><li>Uridine diphospho-N-acetylenolpyruvylglucosamine reductase (MurB) (N-terminal domain) [<cite idref="PUB00031941"/>].</li></ul> </p>