CRYSTAL STRUCTURE OF PUTATIVE NADH DEHYDROGENASE/NAD(P)H NITROREDUCTASE (BDI_1728) FROM PARABACTEROIDES DISTASONIS ATCC 8503 AT 1.86 A RESOLUTION 3M5K OXIDOREDUCTASE, STRUCTURAL GENOMICS, JOINT CENTER FOR STRUCTURAL GENOMICS, JCSG, PROTEIN STRUCTURE INITIATIVE, PSI-2