Requires thiamine diphosphate as cofactor. The enzyme from the denitrifying bacterium Azoarcus evansii is specific for phenylglyoxylate. 2-Oxoisovalerate is oxidized at 15% of the rate for phenylglyoxylate. Also reduces viologen dyes. Contains iron-sulfur centres and FAD.
2 * 50000 + 2 * 48000 + 2 * 43000 + 2 * 24000 + 2 * 11500, SDS-PAGE. The enzyme complex consists of a core enzyme of 4 subunits with the composition alpha2beta2gamma2delta2, this complex is able to reduce viologen dyes. The holoenzyme contains in addition an epsilon2 unit that catalyzes the transfer of electrons from a small ferredoxin-like subunit of the core complex to NAD, this unit also catalyzes the transhydrogenase reaction, carries FAD and resembles ferredoxin:NAD(P)+-oxidoreductase