Heterodisulfide reductase, subunit A/methylviologen reducing hydrogenase, subunit delta; Part of a complex that catalyzes the reversible reduction of CoM-S-S-CoB to the thiol-coenzymes H-S-CoM (coenzyme M) and H-S-CoB (coenzyme B).

NADH oxidase (noxA-4); Similar to GB:L77117 SP:Q58065 PID:1591361 percent identity: 36.71; identified by sequence similarity; putative.

Molybdopterin oxidoreductase, iron-sulfur binding subunit; Similar to SP:P31076 GB:X65042 PID:48527 percent identity: 46.93; identified by sequence similarity; putative.

Molybdopterin oxidoreductase, iron-sulfur binding subunit; Part of a membrane-bound tetrathionate reductase that catalyzes the reduction of tetrathionate to thiosulfate. TtrB is probably involved in transfer of electrons from TtrC to TtrA (By similarity).

Molybdopterin oxidoreductase, membrane subunit; Has menaquinol-oxidizing activity. HmeB subunit may function as a menaquinol-oxidizing site. HmeA, HmeB and HmeE subunits may together catalyze electron transfer from menaquinol to cytochrome c.

nifS protein, class-V aminotransferase (nifS-1); Master enzyme that delivers sulfur to a number of partners involved in Fe-S cluster assembly, tRNA modification or cofactor biosynthesis. Catalyzes the removal of elemental sulfur atoms from cysteine to produce alanine. Functions as a sulfur delivery protein for Fe-S cluster synthesis onto IscU, an Fe-S scaffold assembly protein, as well as other S acceptor proteins.

nifS protein, class-V aminotransferase (nifS-2); Catalyzes the removal of elemental sulfur from cysteine to produce alanine (Probable). Binds 1 2Fe-2S cluster per subunit in a crystal formed under reducing conditions; this subunit provides 1 ligand while IscU provides the other 3 ligands. It is likely that Fe-S cluster coordination is flexible as the role of this complex is to build and then hand off Fe-S clusters.

Molybdopterin oxidoreductase, membrane subunit; Similar to SP:P31077 GB:X65042 PID:48528 percent identity: 26.03; identified by sequence similarity; putative.