The present invention is directed to compositions and methods comprising NAD(P)H oxidases, particularly bacterial oxidases, nucleic acids, recombinant plasmid vectors and recombinant proteins therein encoded, and host cells comprising the oxidases and nucleic acids. The present invention also comprises an isolated bacterial oxidase that oxidizes both NADH and NADPH. Methods for producing the enzymes and enzymatic reactions comprising use of NAD(P)H oxidases and products of such reactions are also disclosed.