Amino acid alignment of Sinorhizobium PdxR with 4PE dehydrogenase and FMN/FAD-containing oxidoreductase homologs from other organisms. Identical and similar sequences present in three or more sequences are indicated by a black background. Abbreviations: PdxR, 4PE dehydrogenase (S. meliloti IFO 14782); gi 15888067, hypothetical protein AGR_C_1314 (Agrobacterium tumefaciens str. C58); gi 17987810, glycolate oxidase subunit GlcD (Brucella melitensis 16 M); gi 16127619, FAD-binding oxidoreductase (Caulobacter crescentus CB15); gi 17546275, probable oxidoreductase protein (Ralstonia solanacearum GMI1000); gi 13477075, similar to actin-interacting protein (Mesorhizobium loti MAFF303099).