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  • A hydrogenase is an enzyme that catalyses the reversible oxidation of molecular hydrogen (H2). Hydrogenases play a vital role in anaerobic metabolism.
  • Hydrogen uptake (H2 oxidation) is coupled to the reduction of electron acceptors such as oxygen, nitrate, sulfate, carbon
    dioxide, and fumarate, whereas proton reduction (H2 evolution) is essential in pyruvate fermentation and in the disposal of
    excess electrons.


  • The fermentative hyperthermophile Pyrococcus furiosus contains an NADPH-utilizing, heterotetrameric, cytoplasmic hydrogenase that catalyzes both H2 production and the reduction of elemental sulfur to H2S.
  • The hydrogenase, also known as sulfhydrogenase because of its S0-reducing activity, is a Ni-containing, iron-sulfur flavoprotein that also serves to reduce H1 to H2. Sulfide dehydrogenase is an iron-sulfur flavoprotein which also functions as a ferredoxin:NADP oxidoreductase.


  • Hydrogenase electrodes are capable of consuming hydrogen directly from microbial media, which ensures their use as fuel
    electrodes in treatment of organic wastes.
  • Adequate uptake hydrogenase activity in soybean bacteroids often increases plant growth, as well as the efficiency of energy utilization during nitrogen fixation.
  • Fe-hydrogenase is a distinct class of hydrogen-producing metalloenzyme, present in a wide variety of prokaryotes and


  • The structure of the HndAc domain and the mapping of the HndDN interacting site obtained by heteronuclear NMR spectroscopy, and analyze the role of HndB within this NADP-reducing hydrogenase complex.
  • Sequence similarities between H2ases and complex I (NADH dehydrogenase) were fi rst reported by Böhm et al.and by Pilkington  et al. and have been emphasized in several subsequent reports.

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