Formaldehyde-activating enzyme is an enzyme required for energy metabolism and formaldehyde detoxification. It catalyses the condensation of formaldehyde and tetrahydromethanopterin to methylene tetrahydromethanopterin [1].

1: Novel formaldehyde-activating enzyme in Methylobacterium extorquens AM1 required for growth on methanol. Vorholt JA, Marx CJ, Lidstrom ME, Thauer RK; J Bacteriol. 2000;182:6645-6650. PMID:11073907

2: How an enzyme binds the C1 carrier tetrahydromethanopterin. Structure of the tetrahydromethanopterin-dependent formaldehyde-activating enzyme (Fae) from Methylobacterium extorquens AM1. Acharya P, Goenrich M, Hagemeier CH, Demmer U, Vorholt JA, Thauer RK, Ermler U; J Biol Chem. 2005;280:13712-13719. PMID:15632161