Mediates chemotaxis towards D-galactose, L-arabinose and D-fucose but not towards D-fructose. Probably part of a binding-protein high affinity uptake system. Induced by D-galactose, L-arabinose and D-fucose. Not induced by stress conditions such as nitrogen limitation, osmotic stress, salt stress or temperature stress. SbpA from A.brasilense cannot complement an Agrobacterium chvE mutant with regard to vir gene expression. Belongs to the bacterial solute-binding protein 2 family.