Catalyzes the phosphorylation of fructose 6-phosphate to fructose 1,6-bisphosphate using ADP as the phosphate donor. As a phosphoryl group donor, ADP can be replaced by GDP, ATP, and GTP to a limited extent. ADP + beta-D-fructose 6-phosphate = AMP + beta-D-fructose 1,6-bisphosphate + H(+) Binds 1 Mg(2+) ion per subunit. Inhibited by AMP and ATP. The kinetic parameters were measured at 50 degrees Celsius. Optimum pH is 6.5. Carbohydrate degradation; glycolysis. Homotetramer. Belongs to the carbohydrate kinase PfkC family.