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Structure of the active site in KefF. Aromatic residues of both subunits contribute to the active site of KefF; the backbone of one subunit is shown in blue and the other in gray. Histidine 112 (pink) is proposed to be important for charge stabilization on the reduced FMN during the catalytic cycle, with further delocalization to Y68 or Y134. The image was generated with PyMOL on the basis of the KefF crystal structure (36).
