TonB-dependent receptor probably involved in ulvan degradation (Probable). Ulvan is the main polysaccharide component of the Ulvales (green seaweed) cell wall. It is composed of disaccharide building blocks comprising 3-sulfated rhamnose (Rha3S) linked to D-glucuronic acid (GlcA), L-iduronic acid (IduA), or D-xylose (Xyl) (Probable). The TonB-dependent receptor may mediate transport of ulvan oligosaccharides from the surface of the outer membrane to the periplasm for subsequent degradation (By similarity). By ulvan and rhamnose. Belongs to the TonB-dependent receptor family.