ID 4.3.1.4 DE formimidoyltetrahydrofolate cyclodeaminase. AN formiminotetrahydrofolate cyclodeaminase. CA 5-formimidoyltetrahydrofolate + 2 H(+) = (6R)-5,10- CA methenyltetrahydrofolate + NH4(+). CC -!- In eukaroytes, occurs as a bifunctional enzyme that also has CC EC 2.1.2.5 activity. DR Q9YH58, FTCD_CHICK ; Q54JL3, FTCD_DICDI ; O95954, FTCD_HUMAN ; DR Q91XD4, FTCD_MOUSE ; P53603, FTCD_PIG ; O88618, FTCD_RAT ; //