1.8.1.16 FAD formation of a charge-transfer complex between one of the newly reduced active site thiols and the oxidized FAD 1.8.1.16 FAD the enzyme forms a dimer, with each monomer consisting of a FAD domain, a Rossmann fold NADH binding domain, and an interface domain 1.8.1.16 NAD+ the enzyme forms a dimer, with each monomer consisting of a FAD domain, a Rossmann fold NADH binding domain, and an interface domain 1.8.1.16 NADH preferred cofactor