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Methenyltetrahydromethanopterin (methenyl-H4MPT) cyclohydrolase (MCH). MCH is a cytoplasmic enzyme that has been identified in methanogenic archaea, sulfate- reducing archaea, and methylotrophic bacteria. It catalyzes the reversible formation of N(5), N(10)-methenyltetrahydromethanopterin (methenyl-H4MPT+) from N(5)-formyltetrahydromethanopterin (formyl- H4MPT), in the third step of the reaction to reduce CO2 to CH4. The protein functions as a homodimer or homotrimer, depending on the organism.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",