Involved in the assembly of mitochondrial iron-sulfur proteins. Probably involved in the binding of an intermediate of Fe/S cluster assembly. Arabidopsis thaliana (taxid: 3702)
Involved in the assembly of mitochondrial and cytoplasmic iron-sulfur proteins. Probably involved in the binding of an intermediate of Fe/S cluster assembly.
Score = 119 bits (302), Expect = 5e-37
Identities = 40/82 (48%), Positives = 60/82 (73%)
Query: 7 LKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKLR 66
L++GVK GC+GL Y L + DE + DE+ E GVK+++DPK+L ++ G+++D+V++ L
Sbjct: 24 LRVGVKGGGCSGLQYGLEFDDEPNEDDEVFEQDGVKVVVDPKSLPYLDGSEIDYVEELLG 83
Query: 67 SEFVFINPNSKGQCGCGESFMT 88
S F F NPN+KG CGCG+SF
Sbjct: 84 SGFTFTNPNAKGTCGCGKSFSV 105
Proteins in this subfamily appear to be associated with the process of FeS-cluster assembly. The HesB proteins are associated with the nif gene cluster and the Rhizobium gene IscN has been shown to be required for nitrogen fixation. Nitrogenase includes multiple FeS clusters and many genes for their assembly. The E. coli SufA protein is associated with SufS, a NifS homolog and SufD which are involved in the FeS cluster assembly of the FhnF protein. The Azotobacter protein IscA (homologs of which are also found in E.coli) is associated which IscS, another NifS homolog and IscU, a nifU homolog as well as other factors consistent with a role in FeS cluster chemistry. A homolog from Geobacter contains a selenocysteine in place of an otherwise invariant cysteine, further suggesting a role in redox chemistry [Biosynthesis of cofactors, prosthetic groups, and carriers, Other]. Length = 105
>gnl|CDD|223393 COG0316, sufA, Fe-S cluster assembly scaffold protein [Posttranslational modification, protein turnover, chaperones]
Score = 94.9 bits (236), Expect = 4e-27
Identities = 43/80 (53%), Positives = 57/80 (71%)
Query: 7 LKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKLR 66
L+LGVK GC+G++Y L + DE D + EDKGVKI+ID K+L ++ GT++DFV + L
Sbjct: 24 LRLGVKTSGCSGMAYVLEFVDEPTPDDIVFEDKGVKIVIDGKSLQYLDGTQLDFVKEGLN 83
Query: 67 SEFVFINPNSKGQCGCGESF 86
F F NPN K +CGCGESF
Sbjct: 84 EGFKFTNPNVKDECGCGESF 103
This model represents the IscA component of the ISC system for iron-sulfur cluster assembly. The ISC system consists of IscRASU, HscAB and an Isc-specific ferredoxin. IscA previously was believed to act as a scaffold and now is seen as an iron donor protein. This clade is limited to the proteobacteria [Biosynthesis of cofactors, prosthetic groups, and carriers, Other]. Length = 105
Score = 89.5 bits (222), Expect = 6e-25
Identities = 37/80 (46%), Positives = 53/80 (66%)
Query: 7 LKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKLR 66
++LGVK GC G+ Y L+ E K D+L+E G K+ + P+A++ ++GT++DFV LR
Sbjct: 26 IRLGVKKTGCAGMEYVLDLVSEPKKDDDLIEHDGAKVFVAPEAVLFILGTQVDFVRTTLR 85
Query: 67 SEFVFINPNSKGQCGCGESF 86
F F NPN+ CGCGESF
Sbjct: 86 QGFKFNNPNATSACGCGESF 105
This model represents the SufA protein of the SUF system of iron-sulfur cluster biosynthesis. This system performs FeS biosynthesis even during oxidative stress and tends to be absent in obligate anaerobic and microaerophilic bacteria [Biosynthesis of cofactors, prosthetic groups, and carriers, Other]. Length = 107
Score = 81.9 bits (203), Expect = 5e-22
Identities = 30/68 (44%), Positives = 47/68 (69%)
Query: 7 LKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKLR 66
L++GV+ GC+G SY L + DE + DE+ E GV +++D K+L ++ GT++DFV++ L
Sbjct: 24 LRIGVRYGGCSGFSYGLTFEDEPDEGDEVFEQDGVTVVVDEKSLPYLEGTEIDFVEELLG 83
Query: 67 SEFVFINP 74
S F F NP
Sbjct: 84 SGFTFSNP 91
This family is involved in iron-sulphur cluster biosynthesis. Its members include proteins that are involved in nitrogen fixation such as the HesB and HesB-like proteins. Length = 91
This model represents the SufA protein of the SUF system of iron-sulfur cluster biosynthesis. This system performs FeS biosynthesis even during oxidative stress and tends to be absent in obligate anaerobic and microaerophilic bacteria.
>TIGR00049 Iron-sulfur cluster assembly accessory protein
Proteins in this subfamily appear to be associated with the process of FeS-cluster assembly. The HesB proteins are associated with the nif gene cluster and the Rhizobium gene IscN has been shown to be required for nitrogen fixation. Nitrogenase includes multiple FeS clusters and many genes for their assembly. The E. coli SufA protein is associated with SufS, a NifS homolog and SufD which are involved in the FeS cluster assembly of the FhnF protein. The Azotobacter protein IscA (homologs of which are also found in E.coli) is associated which IscS, another NifS homolog and IscU, a nifU homolog as well as other factors consistent with a role in FeS cluster chemistry. A homolog from Geobacter contains a selenocysteine in place of an otherwise invariant cysteine, further suggesting a role in redox chemistry.
>KOG1119 consensus Mitochondrial Fe-S cluster biosynthesis protein ISA2 (contains a HesB-like domain) [Energy production and conversion; Intracellular trafficking, secretion, and vesicular transport]
IscR (TIGR02010) is an iron-sulfur cluster-binding transcriptional regulator (see Genome Property GenProp0138). Members of this protein family include YhgI, whose expression is under control of IscR, and show sequence similarity to IscA, a known protein of iron-sulfur cluster biosynthesis. These two lines of evidence strongly suggest a role as an iron-sulfur cluster biosynthesis protein. An older study designated this protein GntY and suggested a role for it and for the product of an adjacent gene, based on complementation studies, in gluconate utilization.
This model represents a family of small proteins related to HesB and its close homologs, which are likely to be invovlved in iron-sulfur cluster assembly (See TIGR00049 and pfam01521). Several members are selenoproteins, with a TGA codon and Sec residue that aligns to the conserved Cys of the HesB domain. A variable Cys/Ser/Gly-rich C-terminal region is not included in the seed alignment and model.
>PF01521 Fe-S_biosyn: Iron-sulphur cluster biosynthesis; InterPro: IPR000361 The proteins in this entry are variously annotated as iron-sulphur cluster insertion protein or Fe/S biogenesis protein
They appear to be involved in Fe-S cluster biogenesis. This family includes IscA, HesB, YadR and YfhF-like proteins. The hesB gene is expressed only under nitrogen fixation conditions []. IscA, an 11 kDa member of the hesB family of proteins, binds iron and [2Fe-2S] clusters, and participates in the biosynthesis of iron-sulphur proteins. IscA is able to bind at least 2 iron ions per dimer []. Other members of this family include various hypothetical proteins that also contain the NifU-like domain (IPR001075 from INTERPRO) suggesting that they too are able to bind iron and are involved in Fe-S cluster biogenesis. The HesB family are found in species as divergent as Homo sapiens (Human) and Haemophilus influenzae suggesting that these proteins are involved in basic cellular functions []. ; PDB: 2D2A_A 1X0G_D 1NWB_A 2K4Z_A 1R94_B 1R95_A 1S98_B 2P2E_A 2QGO_A 2APN_A.
>COG4841 Uncharacterized protein conserved in bacteria [Function unknown]
Score = 46.2 bits (108), Expect = 4e-06, Method: Compositional matrix adjust.
Identities = 27/89 (30%), Positives = 43/89 (48%)
Query: 3 QRPYLKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVD 62
Q L++ V+ C Y L E D L + +G I I +A + G ++D+++
Sbjct: 24 QAAILRIQVQPSECGDWRYDLALVAEPKPTDLLTQSQGWTIAIAAEAAELLRGLRVDYIE 83
Query: 63 DKLRSEFVFINPNSKGQCGCGESFMTTSS 91
D + F F NPN+ CGCG +F + S
Sbjct: 84 DLMGGAFRFHNPNASQTCGCGMAFRVSRS 112
Score = 142 bits (359), Expect = 2e-45
Identities = 34/81 (41%), Positives = 48/81 (59%)
Query: 7 LKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKLR 66
++LGVK GC G Y L+ E K D L E G K+ + +A+ + GT++DFV + L
Sbjct: 64 VRLGVKQTGCAGFGYVLDSVSEPDKDDLLFEHDGAKLFVPLQAMPFIDGTEVDFVREGLN 123
Query: 67 SEFVFINPNSKGQCGCGESFM 87
F F NP ++ +CGCGESF
Sbjct: 124 QIFKFHNPKAQNECGCGESFG 144
Score = 123 bits (311), Expect = 2e-38
Identities = 26/86 (30%), Positives = 42/86 (48%)
Query: 6 YLKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDFVDDKL 65
L++ V+ C Y L E D L + +G I I +A + G ++D+++D +
Sbjct: 27 ILRIQVQPSECGDWRYDLALVAEPKPTDLLTQSQGWTIAIAAEAAELLRGLRVDYIEDLM 86
Query: 66 RSEFVFINPNSKGQCGCGESFMTTSS 91
F F NPN+ CGCG +F + S
Sbjct: 87 GGAFRFHNPNASQTCGCGMAFRVSRS 112
Score = 102 bits (256), Expect = 7e-30
Identities = 32/86 (37%), Positives = 50/86 (58%)
Query: 1 QRQRPYLKLGVKARGCNGLSYTLNYADERAKFDELVEDKGVKILIDPKALMHVIGTKMDF 60
+ P L++ V GC+G Y + + D + D + E GVK++IDP ++ +V G ++D+
Sbjct: 28 NIENPILRIRVVPGGCSGFQYAMGFDDTVEEGDHVFEYDGVKVVIDPFSMPYVNGAELDY 87
Query: 61 VDDKLRSEFVFINPNSKGQCGCGESF 86
V D + F NPN+ G CGCG SF
Sbjct: 88 VVDFMGGGFTIRNPNATGSCGCGSSF 113
