ID 1.5.99.9 DE Methylenetetrahydromethanopterin dehydrogenase. AN 5,10-methylenetetrahydromethanopterin dehydrogenase. AN N(5),N(10)-methylenetetrahydromethanopterin dehydrogenase. CA 5,10-methylenetetrahydromethanopterin + coenzyme F420 = 5,10- CA methenyltetrahydromethanopterin + reduced coenzyme F420. CC -!- Coenzyme F420 is a 7,8-didemethyl-8-hydroxy-5-deazariboflavin CC derivative; methanopterin is a pterin analog. CC -!- The enzyme is involved in the formation of methane from CO(2) in CC Methanobacterium thermoautotrophicum. //