Catalyzes the reversible conversion of fructoselysine 6-phosphate to glucose 6-phosphate and lysine (PubMed:12147680). Functions in a fructoselysine degradation pathway that allows E.coli to grow on fructoselysine or psicoselysine (PubMed:14641112). H2O + N(6)-(6-phospho-D-fructosyl)-L-lysine = D-glucose 6-phosphate + L-lysine Strongly inhibited by ZnCl(2). Carbohydrate metabolism; fructoselysine degradation; D-glucose 6-phosphate and lysine from fructoselysine: step 2/2. Homododecamer. Induced by fructoselysine and psicoselysine. Makes part of the frl operon with FrlA, FrlC, FrlD and FrlR. Cells lacking this gene are unable to grow on fructoselysine or psicoselysine, where they do grow on glucose. Extended N-terminus.