Deinoxanthin and lipid-binding sites of the SDBC. The images show side and top views of the model, and a side view of the map with details of the deinoxanthin (DX) and the lipid-binding sites. DX is shown in pink and the two different lipids are shown in yellow, external lipid (EL), and orange, the internal one (IL). The inset shows a detail of these sites. A scale bar represents 50 Å. OM, outer membrane; PP, periplasm; SDBC, S-layer deinoxanthin-binding complex; SL, S-layer.