methenyltetrahydromethanopterin cyclohydrolase

Noun

 * 1)  A hydrolase enzyme that catalyzes the chemical reaction 5,10-methenyl-5,6,7,8-tetrahydromethanopterin + H2O $$\rightleftharpoons$$ 5-formyl-5,6,7,8-tetrahydromethanopterin.