 5,10-Methenyltetrahydromethanopterin hydrogenase

The 5,10-methenyltetrahydromethanopterin hydrogenase (or Hmd), the so-called iron-sulfur cluster-free hydrogenase, is an enzyme found in methanogenic archea such as Methanothermobacter marburgensis.It was discovered and first characterized by the Thauer group at the Max Planck Institute in Marburg.