Probable rubredoxin protein, 61% Identity to SProt;P30778, P31912. Has PF00301, Rubredoxin;Rubredoxin is a low molecular weight iron-containing bacterial protein involved in electron transfer,sometimes replacing ferredoxin as an electron carrier. No signal peptide. No TMHs; High confidence in function and specificity; Belongs to the rubredoxin family.

Hydrogenase expression/formation protein hupH, 58% similarity to SwissProt:Q03007. TrEMBL;Q6PTB0,TrEMBL;P95499, SwissProt;P19932. Has PF04809(IPR006894):HupH hydrogenase expression protein, C-terminal conserved region;This family represents a C-terminal conserved region found in these bacterial proteins necessary for hydrogenase synthesis. Their precise function is unknown. No Signal peptide or TMH reported Present; High confidence in function and specificity.

Hydrogenase-1 operon protein HyaE, 50% similarity to TrEMBL;Q8XGC7, 46% similarity to SwissProt;P19931. Alias: hupG Has PF07449:Hydrogenase-1 expression protein HyaE(IPR010893);This family contains bacterial hydrogenase-1 expression proteins approximately 120 residues long. This includes the E. coli protein HyaE, and the homologous proteins HoxO of R. eutropha and HupG of R. leguminosarum. Deletion of the hoxO gene in R. eutropha led to complete loss of the uptake [NiFe] hydrogenase activity, suggesting that it has a critical role in hydrogenase assembly. No signal peptide or TMH repor [...]

Putative Hydrogenase expression/formation protein hupF,43% similarity to TrEMBL; Q6PTB2. No Signal Peptide or TMH reported present. Has PF01455:HupF/HypC family(IPR001109);The large subunit of [NiFe]-hydrogenase,as well as other nickel metalloenzymes, is synthesized as a precursor devoid of the metalloenzyme active site. This precursor then undergoes a complex post-translational maturation process that requires a number of accessory proteins. The hydrogenase expression/formation proteins (HUPF/HYPC) form a family of small proteins that are hydrogenase precursor-specific chaperones requ [...]

Hydrogenase expression/formation protein hupD, 54% identity,(63% simialrity) to SwissProt:Q03004. Aliases: hoxM(SwissProt:P40591), hyaD(E.coli). Has PF01750:Hydrogenase maturation protease;The family consists of hydrogenase maturation proteases. In E. coli HypI the hydrogenase maturation protease is involved in processing of HypE the large subunit of hydrogenases 3, by cleavage of its C-terminal. IPR000671:Peptidase_M52; TIGR00072; hydrog_prot; Signal P reporting SIgnal peptide Present. No TMH present; High confidence in function and specificity.

Probable hydrogenase nickel inorporation protein hypA; Involved in the maturation of [NiFe] hydrogenases. Required for nickel insertion into the metal center of the hydrogenase.

Ferredoxin hydrogenase, small subunit. Homology to hoxK of A. eutrophus of 83% (sprot:MBHS_ALCEU). This enzyme recycles the H(2) produced by nitrogenase to increase the production of ATP and to protect nitrogenase against inhibition or damage by O(2) under carbon- or phosphate-limited conditions. Tigrfam: hydA: hydrogenase (NiFe) small subunit Pfam: NADH ubiquinone oxidoreductase 20kD signal peptide no TMHs; High confidence in function and specificity.

Ferredoxin hydrogenase, small subunit. Homology to hoxB of A. hydrogenophilus of 75% (TREMBL:P94154). Hydrogenases catalyse the reversible oxidation of molecular hydrogen and play a vital role in anaerobic metabolism. InterPro: Hydrogenase (NiFe) small subunit HydA (IPR001821); Respiroatory-chain NADH dehydrogenase 20 kD subunit (IPR006137) Tigrfam: hydA: hydrogenase (NiFe) small subunit (hydA) Pfam: NADH ubiquinone oxidoreductase no signal peptide no TMHs; High confidence in function and specificity.

Probable Ni/Fe-hydrogenase, B-type cytochrome subunit. Homology to hupZ of A. chroococcum of 65% (sprot|CYBH_AZOCH) Probable b-type cytochrome. InterPro: Nickel-dependent hydrogenase b-type cytochrome subunit (IPR000516) Pfam: Nickel-dependent hydrogenase b-type cytrochrome subunit no signal peptide 4 TMHs; High confidence in function and specificity.