1.11.1.1 FAD - 395331, 395332, 395333, 395338, 395344, 395345, 742429 1.11.1.1 FAD 2 mol flavin and 1 mol of a non-flavin electron acceptor at the active site 395328 1.11.1.1 FAD enzyme contains flavin and non-flavin redox centers 395334, 395337, 395339, 395340 1.11.1.1 FAD FAD-flavoprotein, 1 mol FAD per 1 mol enzyme 395329 1.11.1.1 FAD flavoprotein. The resonance Raman (RR) modes of the oxidized and twoelectron reduced (EH2) forms of Npx are related to very tight flavin-protein interactions maintaining a nearly planar conformation of the isoalloxazine tricycle, a low level of H-bonding at the N1/N5 and O2/O4 sites, and a strong H-bond at N3H. Minimal changes in FAD structure and environment upon either NAD(H) binding or reduction of the sulfinic redox center 744823 1.11.1.1 rubredoxin rubredoxin-like Fe(SCys)4-domain 700055