catalyzes aldol condensation between L-aspartate-4-semialdehyde (ASA) and dihydroxyacetone phosphate (DHAP), to form 2-amino-4,5-dihydroxy-6-oxo-7-(phosphonooxy)heptanoate. 2-amino-4,5-dihydroxy-6-oxo-7-(phosphooxy)heptanoate = dihydroxyacetone phosphate + L-aspartate 4-semialdehyde Homodecamer. Belongs to the DeoC/FbaB aldolase family. GriI subfamily.