2OBX | A:6-155; F:10-157; G:10-157; B:10-156; C:10-156; H:10-156; D:10-155; E:10-155; I:10-155; J:10-155 | LUMAZINE SYNTHASE RIBH2 FROM MESORHIZOBIUM LOTI (GENE MLL7281, SWISS-PROT ENTRY Q986N2) COMPLEXED WITH INHIBITOR 5-NITRO-6-(D-RIBITYLAMINO)-2,4(1H,3H) PYRIMIDINEDIONE |