Figure 2. Diversity of lipoic acid synthesis genes in β-proteobacteria.
The lipA genes that encode lipoic acid synthase are represented with blue arrows whereas the octanoyl-protein ligase lipB genes are indicated with green arrows. In most species, ybeD, a gene of unknown function is located upstream of the lipB gene (grey arrows) whereas the tatE (Sec-independent protein translocase) encoded downstream of lipA is in yellow. In some cases, a LysR-family transcription factor-encoding gene ybeF is located lipA between lipB is highlighted (orange).