Status Description Organism Genes References
hydrogenase 4 membrane subunit Aggregatibacter actinomycetemcomitans hyfE
hydrogenase small subunit Aquifex aeolicus mbhS1
hydrogenase large subunit Aquifex aeolicus mbhL1
Ni/Fe hydrogenase B-type cytochrome subunit Aquifex aeolicus hoxZ
hydrogenase small subunit Aquifex aeolicus mbhS3
hydrogenase large subunit Aquifex aeolicus mbhL3
hydrogenase large subunit Aquifex aeolicus mbhL2
hydrogenase small subunit Aquifex aeolicus mbhS2
putative hydrogenase protein Azospirillum brasilense hycD
Ni/Fe hydrogenase, cytochrome b subunit Arcobacter butzleri hyaC