. "Catalysis of the reaction: 5-formyltetrahydrofolate + ATP = 5,10-methenyltetrahydrofolate + ADP + H(+) + phosphate." . . "5-formyltetrahydrofolate cyclo-ligase activity" . "5,10-methenyltetrahydrofolate synthetase activity" . "5-formyltetrahydrofolate cyclo-ligase (ADP-forming)" . "5-formyltetrahydrofolate cyclodehydrase" . "5-Formyltetrahydrofolate cyclodehydrase activity" . "formyltetrahydrofolic cyclodehydrase activity" . "methenyl-THF synthetase activity" . . . .