Catalyzes the reversible aldol condensation/cleavage reaction between glyceraldehyde 3-phosphate and dihydroxyacetone phosphate (DHAP) to yield fructose-bisphosphate (FBP). beta-D-fructose 1,6-bisphosphate = D-glyceraldehyde 3-phosphate + dihydroxyacetone phosphate Activated by citrate. Homooctamer or homodecamer. Belongs to the DeoC/FbaB aldolase family. FbaB subfamily. Was originally (Ref.1) thought to be a dehydrin. Extended N-terminus.