Catalyzes the reversible conversion of fructoselysine 6-phosphate to glucose 6-phosphate and lysine. Functions in a fructoselysine degradation pathway that allows E.coli to grow on fructoselysine or psicoselysine. H2O + N(6)-(6-phospho-D-fructosyl)-L-lysine = D-glucose 6-phosphate + L-lysine Carbohydrate metabolism; fructoselysine degradation; D-glucose 6-phosphate and lysine from fructoselysine: step 2/2. Homododecamer.