CRYSTAL STRUCTURE OF PUTATIVE KETOSTEROID ISOMERASE (YP_001303366.1) FROM PARABACTEROIDES DISTASONIS ATCC 8503 AT 1.45 A RESOLUTION ISOMERASE, PUTATIVE KETOSTEROID ISOMERASE, STRUCTURAL GENOMICS, JOINT CENTER FOR STRUCTURAL GENOMICS, JCSG, PROTEIN STRUCTURE INITIATIVE, PSI-2 3KE7