Involved in the uptake of iron in complex with the siderophore anguibactin. Binds ferric-anguibactin in the periplasm and mediates its transport into the cytoplasm. Part of an iron transport system composed of the outer membrane receptor FatA, the periplasmic binding protein FatB and the inner membrane proteins FatC and FatD. The lipoprotein nature of FatB is not essential for activity. Mutants are unable to grow under iron-limiting conditions. Belongs to the bacterial solute-binding protein 8 family.