Unique Methanogenic Coenzymes Methanofuran (MF): a low-molecular-weight coenzyme that interacts in the first step of methanogenesis from Co2 Methanopterin(reduced form tetrahydro-methanopterin or MF): a methanogenetic coenzyme containing a substituted pterin(HA) ring, a CI carrier during the reduction of Co2 to ch4 Coenzyme M: involved in the final step in methane formation, is the carrier of the methyl group that is reduced to methane by the F430-methyl reductase enzyme complex in the final step of methanogenesis. Coenzyme F430: a yellow, soluble, nickel-containing tetrapyrrole that plays an intimate role in the terminal step of methanogenesis as part of the methyl reductase systemUnique Methanogenic Coenzymes Methanofuran (MF): a low-molecular-weight coenzyme that interacts in the first step of methanogenesis from CO2. Methanopterin (reduced form tetrahydro-methanopterin or MF): a methanogenetic coenzyme containing a substituted pterin (蝶呤) ring, a C1 carrier during the reduction of CO2 to CH4. Coenzyme M: involved in the final step in methane formation, is the carrier of the methyl group that is reduced to methane by the F430-methyl reductase enzyme complex in the final step of methanogenesis. Coenzyme F430: a yellow, soluble, nickel-containing tetrapyrrole that plays an intimate role in the terminal step of methanogenesis as part of the methyl reductase system