>TIGR01343 hacA_fam homoaconitate hydratase family protein; InterPro: IPR006251 3-isopropylmalate dehydratase (or isopropylmalate isomerase; 4.2.1.33 from EC) catalyses the stereo-specific isomerisation of 2-isopropylmalate and 3-isopropylmalate, via the formation of 2-isopropylmaleate. This enzyme performs the second step in the biosynthesis of leucine, and is present in most prokaryotes and many fungal species. The prokaryotic enzyme is a heterodimer composed of a large (LeuC) and small (LeuD) subunit, while the fungal form is a monomeric enzyme. Both forms of isopropylmalate are related and are part of the larger aconitase family . Aconitases are mostly monomeric proteins which share four domains in common and contain a single, labile [4Fe-4S] cluster. Three structural domains (1, 2 and 3) are tightly packed around the iron-sulphur cluster, while a fourth domain (4) forms a deep active-site cleft. The prokaryotic enzyme is encoded by two adjacent genes, leuC and leuD, corresponding to aconitase domains 1-3 and 4 respectively , . LeuC does not bind an iron-sulphur cluster. It is thought that some prokaryotic isopropylamalate dehydrogenases can also function as homoaconitase 4.2.1.36 from EC, converting cis-homoaconitate to homoisocitric acid in lysine biosynthesis . Homoaconitase has been identified in higher fungi (mitochondria) and several archaea and one thermophilic species of bacteria, Thermus thermophilus . This entry represents the large subunit of 3-isopropylmalate dehydratase (LeuC), as well as homoaconitase, certain aconitases and uncharacterised proteins, and is a subgroup of those represented in IPR012095. Homoaconitase, aconitase and 3-isopropylmalate dehydratase have similar overall structures and domain organisation . All are dehydratases that bind a [4Fe-4S]-cluster. The majority of the members of this family have been designated as 3-isopropylmalate dehydratase large subunit (LeuC) in microbial genome annotation, but the only characterised member is T. thermophilus homoaconitase, an enzyme of a non-aspartate pathway of lysine biosynthesis. Information about related proteins can be found at Protein of the Month: Aconitase .; GO: 0016836 hydro-lyase activity, 0051539 4 iron 4 sulfur cluster binding, 0008652 amino acid biosynthetic process.

Probab=100.00 E-value=0 Score=847.82 Aligned_cols=422 Identities=29% Similarity=0.438 Sum_probs=354.7 Q ss_pred CCCHHHHHHHHHCCCCCCCCCCCCCCCCCHHHEECCCCHHHHHHHHHHHHHHHHCCCCHHHCCCCCCEEEEEECCCHHHC Q ss_conf 57999999986123554577766364532522000003579999999999999719999992878981399868321100 Q gi|254780451|r 59 TVTKEQIHAFVKWLDNKGTVESEVSYRFSRVLMQDFTGVPAVVDLAAMRDAIVVLGGDPQNINPLVPVDLVIDHSLIVDY 138 (896) Q Consensus 59 ~~~~~~~~~~~~w~~~~~~~~~ei~f~p~Rv~~qD~Tg~pa~vdlaamR~~~~~~g~dp~~inp~vp~dlviDHsv~vd~ 138 (896) T Consensus 1 TiaEKILs~~sg~--k~V~aGdli~a~iD~~m~~D~TaPlai~~L~e~---g~~~V~~Peri------~~~~DH~vPa~~ 69 (432) T TIGR01343 1 TIAEKILSKKSGK--KEVYAGDLIVAEIDLAMVHDITAPLAIKALEEY---GIDKVFDPERI------VIVVDHAVPAKT 69 (432) T ss_pred CCHHHHHHHHCCC--CEECCCCEEEEEEEEEEECCCCHHHHHHHHHHH---CCCCCCCCCCE------EEEECCCCCCCC T ss_conf 9111334753688--702487668870204041056048999999983---57677588714------998438899643 Q ss_pred CCCHHHHHHHHHHHHHHHHHHHHHH-HHHHHHCCCEE-EECCC-CCCHHHHHHHHHCCCEEEECCCCCEEEEEE-EEEEC Q ss_conf 5998899989998875426789999-87742148807-86088-762167789863351131036886179830-13206 Q gi|254780451|r 139 SGNKDAVTRNKDLEYQRNEERYRFL-KWGQKSFKNFR-VVPPG-TGICHQINLEYLGQSVWTKNENGENIAYPD-TCVGT 214 (896) Q Consensus 139 ~g~~~a~~~n~~~e~~rN~Ery~Fl-kwa~~~f~~~~-v~pPG-~GI~HQvnlE~la~vv~~~~~~~~~~a~Pd-tlVGt 214 (896) T Consensus 70 ---ik~------------A~~~k~~~efvkk--~Gi~~F~~~GreGI~HqvL~E-------------~glv~PG~~vvGa 119 (432) T TIGR01343 70 ---IKA------------AEMQKLAREFVKK--KGIKYFFDVGREGICHQVLPE-------------EGLVKPGDLVVGA 119 (432) T ss_pred ---HHH------------HHHHHHHHHHHHH--HCHHHCCCCCCCCCEEEEECC-------------CCEECCCCEEEEC T ss_conf ---789------------9998999999986--160223778885416898326-------------8700678779934 Q ss_pred CCCCCCCCCCHHHHCCCCHHHHHHHHCCCCCEECCCCEEEEEEECCCCCCCCHHHHHHHHHHHHCCCCCCCEEEEEEECC Q ss_conf 88764445201232034348999997077514116728999997677864436889999999841022121279996155 Q gi|254780451|r 215 DSHTTMINALGILGWGVGGIEAEAAMLGCPISMLLPEVVGFEVTGSLQEGVTATDLVLTITQMLRKEGVVSKFVEFFGSG 294 (896) Q Consensus 215 DSHT~~~galG~la~GVGg~eaea~mlGqp~~~~vPevigv~L~G~L~~gVtakDiiL~i~~~Lr~~Gvvgk~vEf~G~g 294 (896) T Consensus 120 DSHTCTyGA~GAFaTG~GsTD~A~a~A~Gk~W~rVPEs~~v~~~G~L~p~V~aKDviL~~I~~iG~DGAtY~a~Ef~Ge~ 199 (432) T TIGR01343 120 DSHTCTYGALGAFATGVGSTDIAYAIATGKVWFRVPESIKVQLTGKLNPGVTAKDVILEVIGEIGVDGATYKAMEFHGET 199 (432) T ss_pred CCCHHHHHHHHHHHCCCCHHHHHHHHHHCCCEEECCCEEEEEEEEECCCCCCCHHHHHHHHHHHCCCCCCEEEEEEECCE T ss_conf 73122345576541374458999999828610215718999988303899650366632226544787520689981732 Q ss_pred CCCCCHHHHHHHHCCCCCCCCCEEEECCCHHHHHHHHHCC-CC--HHHHHHHHHHHHHHHCCCCCCCCCCCCCCEEEEEE Q ss_conf 0017875632120001003720377519989999998639-99--88999999874641023676766788630699998 Q gi|254780451|r 295 FESMVLADRATIANMAPEYGATCGFFPVDRGTIDYLRLSG-RS--NSRVDLVEAYTKVQGMWREDIDYEKVAFTKKMKLD 371 (896) Q Consensus 295 i~~LS~~dRaTIaNMa~E~GAt~gifp~De~T~~YL~~tG-R~--~~~v~lve~Y~ka~~l~~~~~~d~~a~Y~~vieiD 371 (896) T Consensus 200 ~~~~~~~~R~TlaNMAiEaGgKtGii~~De~T~~Y~~~~Gv~~~~dedi~~-------~~~~~v~~~DedA~Y~~e~EiD 272 (432) T TIGR01343 200 VKNMDMEERLTLANMAIEAGGKTGIIEPDEKTIEYLKERGVAKESDEDIAK-------LKPFRVYKSDEDAEYAKEVEID 272 (432) T ss_pred EEECCHHHHHHHHHHHHHCCCCEEEECCCHHHHHHHHHHCCCCCCHHHHCC-------CCCEEEECCCCCCCCCEEEEEE T ss_conf 452664346679889998188314773672799999971787544023405-------7753885188886500489987 Q ss_pred CCCCCCHHCCCCCCCCEEEHHHHHHHHHHHHHHHCCCHHHHHHHCCCCCCCCCCCCCCEEEEEEECCCCCCCHHHHHHHH Q ss_conf 03143012265665641367773011668766400110023210245788888755544575310467654599987788 Q gi|254780451|r 372 LGNVSPSVAGPRRPESRLSLSEVPSSFVTEMNEYYKKSHTLDEKYPVKGCDFHLKHGDVAIASITSCTNTFNPSVMIGAG 451 (896) Q Consensus 372 Ls~ieP~VAgP~~P~d~v~l~~v~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~l~~g~VvIAaIgSCTNtSnp~~miaAg 451 (896) T Consensus 273 ~~~~eP~va~Ph~vdNV~~vse~~G------------------------------~~~vdQvfIGsCTNGRl~DLr~AAk 322 (432) T TIGR01343 273 ASQLEPVVAVPHNVDNVKPVSEVEG------------------------------RIEVDQVFIGSCTNGRLEDLRVAAK 322 (432) T ss_pred EECCCCEECCCCCCCCCCCCCCCCC------------------------------CEEEEEEEEEECCCCCHHHHHHHHH T ss_conf 1046843223777988731355678------------------------------6066058884023774678999999 Q ss_pred HHHHHHHHCCCC-CCCCCEEEEECCCHHHHHHHHHCCCHHHHHHHCCEECCCCCCCCCC-CCCCCCCHHHHHCCCCCEEE Q ss_conf 999889864987-5867307970161899999998588577775053020553224212-77768830221011366358 Q gi|254780451|r 452 LLARNAVRAGLK-SKPWVKTSCAPGSQVSYEYLVQAGLVEYLEALGFSLVGFGCTTCIG-NSGALKKEISEVIHQKSLVV 529 (896) Q Consensus 452 llAkkAv~~Glk-v~p~Vkt~l~PGS~~V~~~L~~~Gll~~L~~aGf~i~~~GCg~CiG-nsG~l~~~i~~~i~~~~l~~ 529 (896) T Consensus 323 iL-kaalkqGr~GV~~~VrliViPAS~~vy~qAL~eGli~~F~~AGa~v~~PgCGpClG~H~GVLA~G--------E--- 390 (432) T TIGR01343 323 IL-KAALKQGRKGVAPDVRLIVIPASKAVYLQALKEGLIEIFVEAGAVVSTPGCGPCLGAHQGVLAPG--------E--- 390 (432) T ss_pred HH-HHHHHCCCCCCCCCCEEEEECCCHHHHHHHHHCCHHHHHHHCCEEECCCCCCHHHHCCCCCCCCC--------C--- T ss_conf 99-99975367552788439998464689999850036889977792870888410220456642588--------7--- Q ss_pred EEEECCCCCCCCCCCCCCCCEEECCHHHHHHHHHHCCCCCCCCCCC Q ss_conf 7863367666654685433100059789999985161222310023 Q gi|254780451|r 530 AGVLSGNRNFEGRISPDVEANYLLSPPLVVAYALAGNVRKNLIKDP 575 (896) Q Consensus 530 ~sV~SgNRNFeGR~~p~~~~~yLaSP~lVvA~AiaG~I~~d~~~dp 575 (896) T Consensus 391 vCiSTsNRNF~GRMG~~~a~IYLASPa~aAAsAV~G~i-----a~P 431 (432) T TIGR01343 391 VCISTSNRNFKGRMGDPNAEIYLASPATAAASAVKGYI-----ADP 431 (432) T ss_pred EEECCCCCCCCCCCCCCCCCEEECCHHHHHHHHCCEEE-----ECC T ss_conf 78615577887888885652250475686421110056-----388

HHsearch alignment for GI: 254780451 and conserved domain: TIGR01343