NifU-related protein; A scaffold on which IscS assembles Fe-S clusters. 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.

Putative NifQ protein. Homology to nifQ of A. vinelandii of 33% (sprot|NIFQ_AZOVI(SRS) NifQ is involved in early stages of the biosynthesis of the iron-molybdenum cofactor (FeMo-co), which is an integral part of the active site of dinitrogenase [2]. The conserved C-terminal cysteine residues may be involved in metal binding. Pfam: NifQ no signal peptide no TMHs; Family membership.

Putative CyaY protein; Involved in iron-sulfur (Fe-S) cluster assembly. May act as a regulator of Fe-S biogenesis.

Conserved hypothetical protein. Homology to rsc0810 of R. solanacearum of 71% (trembl|Q8Y180). InterPro: Uncharacterized protein family UPF0033 (IPR001455). Pfam: Uncharacterized protein family UPF0033. no signal peptide. no TMH; Family membership; Belongs to the sulfur carrier protein TusA family.

RrF2 family protein. These are small proteins of 12 to 18 kD which seem to contain a signal sequence, and may represent a family of probable transcriptional regulators. Similar to SWISSPROT: sprot|YOR2_AZOVI (50% Azotobacter vinelandii, hypothetical upf0074 protein) / TREMBL: trembl|Q8Y0M5 (72% Ralstonia solanacearum (Pseudomonas solanacearum), hypothetical protein rsc1018) Pfam: PF02082 Transcriptional regulator. TIGRFAM: TIGR00738 rrf2 family protein (Uncharacterized protein family UPF0074 / putative transcriptional regulator). Signal P reporting signal peptide. HTH reporting nucleic [...]

Probable cysteine desulfurase (NifS protein homolog). Homology to iscS of M. thermophila of 40% (sprot|ISCS_METTE) Catalyzes the removal of elemental sulfur from cysteine to produce alanine (By similarity). InterPro: Aminotransferase class-V (IPR000192) Pfam: aminotransferase class-V no signal peptide no TMHs ahpD: alkylhydroperoxidase AhpD; Family membership.

Fdx2 protein; Ferredoxin 2Fe-2S. Homology to fdx of E. coli of 70% (sprot|FER_ECOLI). Ferredoxin are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. Although the function of this ferredoxin is unknown it is probable that it has a role as a cellular electron transfer protein. Involved in the in vivo assembly of the Fe-S clusters in a wide variety of iron- sulfur proteins. InterPro: Ferredoxin (IPR001055); Adrenodoxin (IPR001055) Pfam: 2Fe-2S iorn-sulfur cluster binding domain no signal peptide no TMHs; High confidence in function and specificity.

Probable ferredoxin. Homology to fdxP of C. crescentus of 51% (sprot|FER2_CAUCR). Ferredons are iron-sulfur proteins that transfer electrons in a wide variety of metabolic reactions. InterPro: Ferredoxin (IPR001041),Adrenodoxin (IPR001055) Pfam: 2Fe-2S iron-sulfur cluster binding domain no signal peptide no TMHs; High confidence in function and specificity.

HesB/yadR/yfhF family protein, 45% identity to TrEMBL;Q9KJL2,Q6HRJ0. SwissProt;P37026(41% identity) Has PF01521, HesB-like domain;IPR000361, HesB_yadR_yfhF;This family includes HesB which may be involved in nitrogen fixation; the hesB gene is expressed only under nitrogen fixation conditions. Other members of this family include various hypothetical proteins of which P46847 and NP31774 also contains NifU-like domains NifU which is also involved in nitrogen fixation. In the gram-negative soil bacterium Rhizobium etli, the hesB-like gene iscN is required for nitrogen fixation; High confi [...]