Posebno bogat prirodni izvor F420 jeMycobacterium smegmatis, u kojoj nekoliko desetina enzima koristi F420 umesto srodnog kofaktoraFMN koji koriste homologni enzimi većine drugih vrsta.[5]
↑Hagemeier CH, Shima S, Thauer RK, Bourenkov G, Bartunik HD, Ermler U (2003). „Coenzyme F420-dependent methylenetetrahydromethanopterin dehydrogenase (Mtd) from Methanopyrus kandleri: a methanogenic enzyme with an unusual quarternary [sic] structure”. J. Mol. Biol.332 (5): 1047–57. DOI:10.1016/S0022-2836(03)00949-5. PMID14499608.
↑GD; Geerts, WJ; Keltjens, JT; Van Der Drift, C; Vogels, GD (1991). „Purification and properties of 5,10-methylenetetrahydromethanopterin dehydrogenase and 5,10-methylenetetrahydromethanopterin reductase, two coenzyme F420-dependent enzymes, from Methanosarcina barkeri”. Biochim. Biophys. Acta.1079 (3): 293–302. DOI:10.1016/0167-4838(91)90072-8. PMID1911853.