| Product Name | methenyltetrahydromethanopterin cyclohydrolase | 
| Example Structure |  | 
| Synonyms | 5,10-methenyltetrahydromethanopterin cyclohydrolase, CBH37751, hydrolase, methenyltetrahydromethanopterin cyclo-, Mch, methenyl-H4MPT cyclohydrolase, methenyl-H4MPT+ cyclohydrolase, methenyltetrahydromethanopterin cyclohydrolase, N5,N10-methenyltetrahydromethanopterin cyclohydrolase | 
| EC Number | 3.5.4.27 | 
| CAS Registry Number |  | 
| Comments | Methanopterin is a pterin analogue. The enzyme is involved in the formation of methane from CO2?in?Methanobacterium thermoautotrophicum. | 
| Cofactor |  | 
| History |  | 
| Reactions | 5,10-methenyl-5,6,7,8-tetrahydromethanopterin + H(2)O = 5-formyl-5,6,7,8- tetrahydromethanopterin. |