>TIGR01981 sufD FeS assembly protein SufD; InterPro: IPR011542 Iron-sulphur (FeS) clusters are important cofactors for numerous proteins involved in electron transfer, in redox and non-redox catalysis, in gene regulation, and as sensors of oxygen and iron. These functions depend on the various FeS cluster prosthetic groups, the most common being [2Fe-2S] and [4Fe-4S] . FeS cluster assembly is a complex process involving the mobilisation of Fe and S atoms from storage sources, their assembly into [Fe-S] form, their transport to specific cellular locations, and their transfer to recipient apoproteins. So far, three FeS assembly machineries have been identified, which are capable of synthesising all types of [Fe-S] clusters: ISC (iron-sulphur cluster), SUF (sulphur assimilation), and NIF (nitrogen fixation) systems. The ISC system is conserved in eubacteria and eukaryotes (mitochondria), and has broad specificity, targeting general FeS proteins , . It is encoded by the isc operon (iscRSUA-hscBA-fdx-iscX). IscS is a cysteine desulphurase, which obtains S from cysteine (converting it to alanine) and serves as a S donor for FeS cluster assembly. IscU and IscA act as scaffolds to accept S and Fe atoms, assembling clusters and transfering them to recipient apoproteins. HscA is a molecular chaperone and HscB is a co-chaperone. Fdx is a [2Fe-2S]-type ferredoxin. IscR is a transcription factor that regulates expression of the isc operon. IscX (also known as YfhJ) appears to interact with IscS and may function as an Fe donor during cluster assembly . The SUF system is an alternative pathway to the ISC system that operates under iron starvation and oxidative stress. It is found in eubacteria, archaea and eukaryotes (plastids). The SUF system is encoded by the suf operon (sufABCDSE), and the six encoded proteins are arranged into two complexes (SufSE and SufBCD) and one protein (SufA). SufS is a pyridoxal-phosphate (PLP) protein displaying cysteine desulphurase activity. SufE acts as a scaffold protein that accepts S from SufS and donates it to SufA . SufC is an ATPase with an unorthodox ATP-binding cassette (ABC)-like component. No specific functions have been assigned to SufB and SufD. SufA is homologous to IscA , acting as a scaffold protein in which Fe and S atoms are assembled into [FeS] cluster forms, which can then easily be transferred to apoproteins targets. In the NIF system, NifS and NifU are required for the formation of metalloclusters of nitrogenase in Azotobacter vinelandii, and other organisms, as well as in the maturation of other FeS proteins. Nitrogenase catalyses the fixation of nitrogen. It contains a complex cluster, the FeMo cofactor, which contains molybdenum, Fe and S. NifS is a cysteine desulphurase. NifU binds one Fe atom at its N-terminal, assembling an FeS cluster that is transferred to nitrogenase apoproteins . Nif proteins involved in the formation of FeS clusters can also be found in organisms that do not fix nitrogen . This entry represents SufD proteins that form part of the SufBCD complex in the SUF system. No specific functions have been assigned to these proteins.; GO: 0005515 protein binding, 0016226 iron-sulfur cluster assembly.

Probab=100.00 E-value=0 Score=589.75 Aligned_cols=323 Identities=28% Similarity=0.422 Sum_probs=298.5 Q ss_pred ECCCHHHHHHCCEEEEEHHHHHHHHHHHHHHHCCC-EECCCC------------CHHHHHHHHHHCCCEEEEECCCCCCC Q ss_conf 02005678747908855899877778988620221-124565------------31466887642384388734774134 Q gi|254781059|r 145 VTTFKEELKKSGVIFMPISEAICEHPDLVKKYLST-VVPVGD------------NFYAALNSAVFTDGSFVYIPKGVRCP 211 (489) Q Consensus 145 ~~~l~~~L~~~GVi~~~l~eA~~~~p~lv~~~~~~-~~~~~~------------~~f~aLn~A~~~~G~fi~Vp~gv~v~ 211 (489) T Consensus 52 ~~~~~~~~~~~G~~~~~l~~~~~~~~~~~~~~~~~~~~~~~e~~~~yL~~~g~d~~~~~~~~~~~~~g~~~~~~~~~~~~ 131 (397) T TIGR01981 52 VSNLVRLVFVNGVFVPDLSDADPLLPELLEDLLEARAVLSDEIQSKYLQFEGADERFTALNAALFNDGTVLYVPKGVEVE 131 (397) T ss_pred CCCCCCHHHCCCEEECHHHHHCCCCCCCCCCCCCCCCCCHHHHHHHCCCCCCCHHHHHHHHHHHCCCEEEEEECCCCEEE T ss_conf 15663001108732000222034664321001377256737999850674583377566556313515999965894773 Q ss_pred CCEEEEEEEC-CCC---CEECCEEEEEEECCCEEEEEECCCCCC-CCCCC-CCCEEEEEEECCCCEEEEEEEEECCCCCC Q ss_conf 2127999965-888---400221489972772499996156765-44444-43305899866995899999630475531 Q gi|254781059|r 212 MELSTYFRIN-EKG---TGQFERTLIIADEGSYVSYLEGCTAPQ-RDENQ-LHAAVVELVALDNAEIKYSTVQNWYPGDS 285 (489) Q Consensus 212 ~PI~~~~~~~-~~~---~~~f~r~lIi~ee~S~v~~iE~~~s~~-~~~~~-~~~~v~Ei~vg~nA~v~~~~iQn~~~~~~ 285 (489) T Consensus 132 ~Pi~~~~~~~~~~~e~~~~~~~~~~i~~~~~~~~~v~e~~~~~~~~~~~~Y~~n~v~~i~~~~~A~v~~~~~~~~----- 206 (397) T TIGR01981 132 EPIEIKFIGVAGEGEKKAFVHPRLLIEVEKGSKITVIERFEGISLNESKAYFTNSVVEITVGANASVSFVRVQDF----- 206 (397) T ss_pred CCEEEEEEEECCCCCEEEEEECCEEEEECCCCEEEEEEEEECCCCCCCCEEEEECEEEEEECCCCEEEEEEEECC----- T ss_conf 348999984067675013653453899868980799998325788864314650408999744878999996158----- Q ss_pred CCCCCEEEEE-EEEEEEECCCEEEEEEEEEECCCEEEEEEEEEEECCCCEEEEEEEEEECCCEEEEEEEEEEEECCCCCC Q ss_conf 1448746401-467863046303899887514634788538998278727999987762598689972189983676611 Q gi|254781059|r 286 QGKGGIYNFV-TKRGDCRGMRSKISWTQLETGSAITWKYPSCLLRGEQSCGEFYSIAISNGFQQIDSGTKMLHLAKNTTS 364 (489) Q Consensus 286 ~~~~~~~~~~-t~r~~~~~~~a~~~~~~~~lG~~~~r~~~~~~L~G~~a~~~~~gi~l~~~~Q~~D~~~~v~H~~p~t~S 364 (489) T Consensus 207 --~~~~~~~~W~~~~~~-~~~a~~~~~~~~~Gg~~~~~~~~~~l~G~~s~~~~~gl~~~~~~~~~D~~~~v~h~~~~~~S 283 (397) T TIGR01981 207 --SKNSTHFSWNHRAKI-GKDARLRLAVVNLGGKLSRHNLDVDLEGEGSKLEVKGLAIGAGRQHVDVRTLVEHNGPDTKS 283 (397) T ss_pred --CCCEEEEEEEEEEEE-ECCCEEEEEEEECCCCEEEEEEEEEEECCCEEEEEEEEEEECCCCEEEEEEEEEECCCCCEE T ss_conf --981699865577765-12865899999927857999987888246407999998751798157777568871666243 Q ss_pred EEEEEEEECCCCEEEEEEEEEECCCCCCCCCEEEEEEEEECCCCEEEEEEEEEEECCCCEEE-EEEEECCCCHHHHHHHH Q ss_conf 01000010589468994014733886587430221058845985486223689834875688-75320247999999998 Q gi|254781059|r 365 RIVSKGISAGFSNNTYRGKVSVHRGAAHSRNFTQCDSLLIGNNCGAHTIPYIESKNSSCNLE-HEATTSKISDEHLFYCL 443 (489) Q Consensus 365 ~~~~K~i~~d~s~~~f~G~i~v~~~A~~t~~~~~~~~LlLs~~a~~~s~P~LeI~~ddv~~~-H~Atvg~id~e~LFYL~ 443 (489) T Consensus 284 ~~~~~g~~~d~a~~vF~G~~~i~~~A~~tda~~~~~~LlLs~~A~~d~~P~LeI~~ddV~~~gHgAtVg~iD~e~LFYLr 363 (397) T TIGR01981 284 NILHRGILDDRAHGVFRGIIRIPKGAKGTDAEQLNRNLLLSDKARADTKPQLEIDADDVKCSGHGATVGQIDDEQLFYLR 363 (397) T ss_pred EEEEEEEECCCCEEEEEEEEEECCCCCCCCEEEEEEEEEECCCCEEEECEEEEEECCCEEECCEECCCCCCCHHHHHHHH T ss_conf 28997799268429999878846557486336563157547876287121679975824321101100335744657676 Q ss_pred HCCCCHHHHHHHHHHHHHHHHHHHCCHHHHHH Q ss_conf 37889899999999998999988589689999 Q gi|254781059|r 444 QRGIPEEAAIALIVNGFVREVLQKLPMEFAVE 475 (489) Q Consensus 444 sRGi~~~~A~~liv~gF~~~v~~~ip~e~~~e 475 (489) T Consensus 364 SRGi~~~~A~~L~i~gF~~e~i~~i~~~~l~~ 395 (397) T TIGR01981 364 SRGIDEEEARRLLIRGFLGEIIEEIPDESLKE 395 (397) T ss_pred HCCCCHHHHHHHHHHHHHHHHHHHCCCHHHHH T ss_conf 37889899999999988643332138815652

HHsearch alignment for GI: 254781059 and conserved domain: TIGR01981