>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=100.00 E-value=0 Score=523.78 Aligned_cols=396 Identities=22% Similarity=0.286 Sum_probs=343.4 Q ss_pred HHHHHHHHHHHHHHHHC-CCCHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCHHHHH--------HH--------CCC- Q ss_conf 79999999999998617-8877899999999999998283239972474258878977--------51--------357- Q gi|254781061|r 6 AVETMLLQSCDEACQKY-YRNQSVVAFRRRLLCDFRTQGLLPTRKIENWHYTDLKNIL--------KV--------LPT- 67 (428) Q Consensus 6 ~~~~~l~~~f~~~~~~~-~~~~~~~~~R~~a~~~F~~~G~lPtkK~E~WKyT~l~~l~--------~~--------~~~- 67 (428) T Consensus 16 ~~~kGLt~~VV~~IS~~K~EP~WMLd~RLrale~f~k~p-~P-----~Wg~~dl~~iD~~~~vyY~~PdCnefkKq~~~~ 89 (469) T TIGR01980 16 ETEKGLTEEVVREISEKKGEPDWMLDFRLRALELFLKMP-MP-----TWGRPDLSGIDIEDIVYYSKPDCNEFKKQSKKT 89 (469) T ss_pred HCCCCCCHHHHHHHHHHCCCCHHHHHHHHHHHHHHHCCC-CC-----CCCCCCCCCCCHHHCCCCCCCCCHHHHHHHHHH T ss_conf 407898889999997305888689999999999884288-89-----888888886786453434377703331012342 Q ss_pred -CCCCCC----------------CCCCCCHHH--CCCCEEEEEECCCCCCCCCCCCCCCCCHHHHCCCC----HHHCCCC Q ss_conf -644321----------------111110000--15815999834654200044575410056521242----0100013 Q gi|254781061|r 68 -NKNSIA----------------TLQKKYKPL--VADSIQLSISQQPSSSILKEKNIEVLPFSHIENTD----ENSYCLE 124 (428) Q Consensus 68 -~~~~~~----------------~~~~~~~~~--~~d~~~i~~~~~~~~~~l~~~~i~~~~~~~~~~~~----~~~~~~~ 124 (428) T Consensus 90 r~~~sWdevP~eIk~TFEkLGIPeaE~k~LaGvav~AQYdSEviY~~~Ke~L~~~GVIF~d~d~Al~~YPdLVKeYF~~v 169 (469) T TIGR01980 90 RKATSWDEVPDEIKDTFEKLGIPEAERKALAGVAVGAQYDSEVIYHNIKEDLEEKGVIFCDMDTALKEYPDLVKEYFGKV 169 (469) T ss_pred CCCCCCCCCCHHHHHHHHHCCCCHHHHHHHCCCEEEEEEEEEEEECCCHHHHHHCCEEECCHHHHHHHCHHHHHHHCCCC T ss_conf 15678234678999876444861799987425357788620446222046756298786385998651725678662700 Q ss_pred -CCCCCCHHHHHHHHHCCCCEEEEEECCEEECCCEEEEEE-CCC-CCCCEEEEEECCCCCCEEEEEECCCCC-CCCEEEC Q ss_conf -455544566788752138748773054477023034320-223-222101210017986135553035667-5520100 Q gi|254781061|r 125 -PLSEHDTIGYINGILSNDGYKVVIPDECQLNVPLELQAI-QCG-GQMHLRYPISFGMNSRTTVVERYTTLT-NDNSFVS 200 (428) Q Consensus 125 -~~~~~d~f~~LN~A~~~~g~~I~V~~~~~~~~PI~i~~~-~~~-~~~~~r~~I~v~~ns~~~iiE~~~~~~-~~~~~~n 200 (428) T Consensus 170 ~VPp~DnKFAALn~AVWSGGsFvYVPkGV~v~~PLqtYFRIN~~~~GQFErTLiIadeGa~VhYiEGCsAP~Y~~~sLHA 249 (469) T TIGR01980 170 CVPPSDNKFAALNGAVWSGGSFVYVPKGVRVDMPLQTYFRINSENTGQFERTLIIADEGASVHYIEGCSAPVYSTNSLHA 249 (469) T ss_pred CCCCCCCHHHHHHHHEEECCEEEEECCCCEECCCCCCCEECCCCCCCCCEEEEEEEEECCEEEEEECCCCCCCCCCCCEE T ss_conf 25876341466402110278579847898666630000002847788632588999517748887023266568887133 Q ss_pred CCEEEEECCCCEEEEEECCCCCCC------EEEEEECEEEEC-CCCCEEEEEEECCCCCEEEEEEEEEECCCCEEEEEEE Q ss_conf 312899648863766300245653------014320001120-3551467786425651244335665135412466334 Q gi|254781061|r 201 SIADIKVGEGADITWVIVLDQGIE------DTHLGQLRVILE-KKSSLKVFVLNIGQGLSRRELSIDVKGEESQFMLRGI 273 (428) Q Consensus 201 ~~~ei~l~~~A~l~~~~iq~~~~~------s~~~~~~~~~~~-~~S~~~~~~~~~Gg~~~R~~i~i~L~Ge~a~~~~~g~ 273 (428) T Consensus 250 a~VE~~v~~~A~~rYtTvQNWs~N~~~KGGvyNlvTKRA~veG~ng~meWv~Gs~GSK~Tm~YPs~iL~G~~A~~e~~sI 329 (469) T TIGR01980 250 AVVELIVKEDARVRYTTVQNWSKNDKNKGGVYNLVTKRALVEGENGTMEWVDGSIGSKITMKYPSSILKGEGAKTEFLSI 329 (469) T ss_pred EEEEEEECCCCEEEEEEEEECCCCCCCCCCEEECCCCEEEEECCCCEEEEEECCHHHHHHHHCCEEEECCCCCCCCCEEE T ss_conf 58999983787589846873037889985448668723789626877999602400024412552478288621142277 Q ss_pred EECCCCCCHHHHHHHHHCCCCCEEEEEEEEEECCCCEEEEECCCCCCCCCCCCCCCEEEEEEEECCCEEEEEEEEEEEEC Q ss_conf 42274410011122221277752688873000488527874101013664100000000046612871798121247713 Q gi|254781061|r 274 NLLSGKAHSDLSMFLRHKVPNTCSTSVIRNIVLEKSTGVFQGAVHVSSEAQGSNARMTANTLLFSNEGSFYVKPELEIFA 353 (428) Q Consensus 274 ~l~~~~q~~D~~~~i~H~~~~t~S~~~~k~vl~d~s~~vf~G~i~V~~~a~~t~~~q~~~~llLs~~a~~~s~P~LeI~~ 353 (428) T Consensus 330 a~A~~gQ~~DTGaK~~H~AP~TSStI~sKSIS~ggG~~~YRGLVk~~~~A~~~k~~v~CD~Ll~Dd~S~SdT~P~~ei~n 409 (469) T TIGR01980 330 ALAGKGQHLDTGAKMIHLAPNTSSTIISKSISKGGGKSSYRGLVKIGKGAKGAKSHVQCDSLLLDDESASDTIPYIEIFN 409 (469) T ss_pred EEECCCCCEECCCEEEEECCCCEEEEEEEEEECCCCEEEEEEEEEECCCCCCCCCEEEEEEEEECCCCCCCCCCEEEEEC T ss_conf 87247630000753687089962488987887588744302578865765577111256655657842213243055526 Q ss_pred CCCEEEEEEEECCCCHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHCCCHHHH Q ss_conf 873365542212389999999994688989999999999999998858978999 Q gi|254781061|r 354 DDVQCGHGATISDINPEHLYYLMARGISKNQACSMLSHAFMSEIVEDLNDQVLQ 407 (428) Q Consensus 354 ddV~~~Hgatvg~id~e~lfYl~sRGi~~~~A~~lli~gF~~~~i~~i~~~~~~ 407 (428) T Consensus 410 ~~v~~~HEAtvsKIsEeqlfYL~sRGl~EedA~~MIV~GF~~pI~keLPmEYAV 463 (469) T TIGR01980 410 DTVSVEHEATVSKISEEQLFYLMSRGLSEEDARAMIVRGFVEPITKELPMEYAV 463 (469) T ss_pred CCCCEEEEEEECCCCHHHHHHHHHCCCCHHHHHHHHHCCCHHHHHHHCCHHHHH T ss_conf 833247855520012456889773788889999997515802565523357889

HHsearch alignment for GI: 254781061 and conserved domain: TIGR01980