Methenyltetrahydrofolate cyclohydrolase
In enzymology, a methenyltetrahydrofolate cyclohydrolase (EC3.5.4.9) is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are 5,10-methenyltetrahydrofolate and H2O, whereas its product is 10-formyltetrahydrofolate.