>TIGR01980 sufB FeS assembly protein SufB; InterPro: IPR010231 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 SufB, which is part of the SUF system and forms a complex with SufBCD.; GO: 0005515 protein binding, 0016226 iron-sulfur cluster assembly.

Probab=95.70 E-value=0.2 Score=29.78 Aligned_cols=289 Identities=15% Similarity=0.202 Sum_probs=167.9 Q ss_pred HHHHHHHHHHHCCCCCCCCCCCCC--CC--CCC-EEEECCCCCCCC----CCC----CCCCCHHHHHHHHHCCCCHHHHH Q ss_conf 999999999968877866587665--68--200-031005653334----332----10158788887765176511111 Q gi|254781059|r 57 WRLLAYRRWLTMKDPSWARIRYPA--ID--FDD-LYYYAAPKSIVG----PQS----LDDVDPELLRTYEKLGIPIREQE 123 (489) Q Consensus 57 ~R~~Al~~f~~l~~P~W~~~~l~~--i~--~~~-i~~~~~p~~~~~----~~s----ld~v~~ei~~tf~kLgip~~e~~ 123 (489) T Consensus 98 vP~eIk~TFEkLGIPeaE~k~LaGvav~AQYdSEviY~~~Ke~L~~~GVIF~d~d~Al~~YPdLVKeYF~~v~VPp~DnK 177 (469) T TIGR01980 98 VPDEIKDTFEKLGIPEAERKALAGVAVGAQYDSEVIYHNIKEDLEEKGVIFCDMDTALKEYPDLVKEYFGKVCVPPSDNK 177 (469) T ss_pred CCHHHHHHHHHCCCCHHHHHHHCCCEEEEEEEEEEEECCCHHHHHHCCEEECCHHHHHHHCHHHHHHHCCCCCCCCCCCH T ss_conf 67899987644486179998742535778862044622204675629878638599865172567866270025876341 Q ss_pred HHCCCCCCCCEEEEEE-CCEEEECCCHHHHHHCCEEE-EEHHHHHHHHHHHHHHHCCCEECCCCCHHHHHHH-HHHCCCE Q ss_conf 1023444431000121-35022020056787479088-5589987777898862022112456531466887-6423843 Q gi|254781059|r 124 ILAGVQTSKVAVDAVF-DSVSVVTTFKEELKKSGVIF-MPISEAICEHPDLVKKYLSTVVPVGDNFYAALNS-AVFTDGS 200 (489) Q Consensus 124 ~l~g~~~~~v~v~~~~-ds~~v~~~l~~~L~~~GVi~-~~l~eA~~~~p~lv~~~~~~~~~~~~~~f~aLn~-A~~~~G~ 200 (489) T Consensus 178 FAAL----n~---AVWSGGsFvYV--P-----kGV~v~~PLq-----------tYF-RIN~~~~GQFE--rTLiIadeGa 229 (469) T TIGR01980 178 FAAL----NG---AVWSGGSFVYV--P-----KGVRVDMPLQ-----------TYF-RINSENTGQFE--RTLIIADEGA 229 (469) T ss_pred HHHH----HH---HEEECCEEEEE--C-----CCCEECCCCC-----------CCE-ECCCCCCCCCE--EEEEEEEECC T ss_conf 4664----02---11027857984--7-----8986666300-----------000-02847788632--5889995177 Q ss_pred EEEECCCCCCCCCEEEEEEECCCCCEECCEEEEEEECCCEEEE--EECCCCCCCCCCCCCCEEEE-EEEC-CCCEEEEEE Q ss_conf 8873477413421279999658884002214899727724999--96156765444444330589-9866-995899999 Q gi|254781059|r 201 FVYIPKGVRCPMELSTYFRINEKGTGQFERTLIIADEGSYVSY--LEGCTAPQRDENQLHAAVVE-LVAL-DNAEIKYST 276 (489) Q Consensus 201 fi~Vp~gv~v~~PI~~~~~~~~~~~~~f~r~lIi~ee~S~v~~--iE~~~s~~~~~~~~~~~v~E-i~vg-~nA~v~~~~ 276 (489) T Consensus 230 ~VhYiEG--CsAP~Y~---~~sLHA---a~VE~~v~~~A~~rYtTvQNWs~N~~~KGGvyNlvTKRA~veG~ng~meWv~ 301 (469) T TIGR01980 230 SVHYIEG--CSAPVYS---TNSLHA---AVVELIVKEDARVRYTTVQNWSKNDKNKGGVYNLVTKRALVEGENGTMEWVD 301 (469) T ss_pred EEEEEEC--CCCCCCC---CCCCEE---EEEEEEECCCCEEEEEEEEECCCCCCCCCCEEECCCCEEEEECCCCEEEEEE T ss_conf 4888702--3266568---887133---5899998378758984687303788998544866872378962687799960 Q ss_pred EEECCCCCCCCCCCEEEEEEEEEEEECCCEEEEEEEEEECCCEEEEEEE--EEEECCCCEEEEEEEEEECCCEEEEEEE- Q ss_conf 6304755311448746401467863046303899887514634788538--9982787279999877625986899721- Q gi|254781059|r 277 VQNWYPGDSQGKGGIYNFVTKRGDCRGMRSKISWTQLETGSAITWKYPS--CLLRGEQSCGEFYSIAISNGFQQIDSGT- 353 (489) Q Consensus 277 iQn~~~~~~~~~~~~~~~~t~r~~~~~~~a~~~~~~~~lG~~~~r~~~~--~~L~G~~a~~~~~gi~l~~~~Q~~D~~~- 353 (489) T Consensus 302 ------Gs-~GSK~Tm~YPs--~iL~G~~A~~e~~sIa~A~~gQ~~DTGaK~~H~AP~TSStI~sKSIS~ggG~~~YRGL 372 (469) T TIGR01980 302 ------GS-IGSKITMKYPS--SILKGEGAKTEFLSIALAGKGQHLDTGAKMIHLAPNTSSTIISKSISKGGGKSSYRGL 372 (469) T ss_pred ------CC-HHHHHHHHCCE--EEECCCCCCCCCEEEEEECCCCCEECCCEEEEECCCCEEEEEEEEEECCCCEEEEEEE T ss_conf ------24-00024412552--4782886211422778724763000075368708996248898788758874430257 Q ss_pred -EEEEECCCCCCEEEEEEEECCC-CEE-------EEEEEEEECCCC Q ss_conf -8998367661101000010589-468-------994014733886 Q gi|254781059|r 354 -KMLHLAKNTTSRIVSKGISAGF-SNN-------TYRGKVSVHRGA 390 (489) Q Consensus 354 -~v~H~~p~t~S~~~~K~i~~d~-s~~-------~f~G~i~v~~~A 390 (489) T Consensus 373 Vk~~~~A~~~k~~v~CD~Ll~Dd~S~SdT~P~~ei~n~~v~~~HEA 418 (469) T TIGR01980 373 VKIGKGAKGAKSHVQCDSLLLDDESASDTIPYIEIFNDTVSVEHEA 418 (469) T ss_pred EEECCCCCCCCCEEEEEEEEECCCCCCCCCCEEEEECCCCCEEEEE T ss_conf 8865765577111256655657842213243055526833247855

HHsearch alignment for GI: 254781059 and conserved domain: TIGR01980