Genomic organization of the genes comprising the lkr–sdh and lysdh–aasadh operons in S. pomeroyi. The (+) signal preceding the numbers 1, 2 and 3 indicates the transcribed frame. SPO followed by 4 digits indicates the NCBI gene identifier. The genes of the LKR/SDH operon encode: PGM, phosphoglycerate mutase; GST, glutathione-S-transferase; LKR, lysine-ketoglutarate reductase; HP, hypothetical protein; SDH, saccharopine dehydrogenase. The genes for the lysdh–aasadh operon encode: QOR, quinone oxidorreductase, AsnC, AsnC transcriptional regulator family; LysDH, lysine dehydrogenase, AASADH, α-aminoadipic-δ-semialdehyde dehydrogenase.