Member of the Rhodanese Homology Domain superfamily. Included in this CD are the Lactococcus lactis NADH oxidase, Bacillus cereus NADH dehydrogenase, and Bacteroides thetaiotaomicron pyridine nucleotide-disulphide oxidoreductase, and similar rhodanese-like domains found C-terminal of the pyridine nucleotide-disulphide oxidoreductase (Pyr-redox) domain and the Pyr-redox dimerization domain.