>TIGR02086 IPMI_arch 3-isopropylmalate dehydratase, large subunit; InterPro: IPR011826 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 enzymes, from prokaryotes. Homoaconitase, aconitase and 3-isopropylmalate dehydratase have similar overall structures and domain organisation . All are dehydratases that bind a [4Fe-4S]-cluster. Information about related proteins can be found at Protein of the Month: Aconitase .; GO: 0003861 3-isopropylmalate dehydratase activity, 0051539 4 iron 4 sulfur cluster binding, 0009098 leucine biosynthetic process.

Probab=100.00 E-value=0 Score=828.11 Aligned_cols=418 Identities=29% Similarity=0.450 Sum_probs=351.2 Q ss_pred CCCHHHHHHHHHCCCCCCCCCCCCCCCCCHHHEECCCCHHHHHHHHHHHHHHH----HCCCCHHHCCCCCCEEEEEECCC Q ss_conf 57999999986123554577766364532522000003579999999999999----71999999287898139986832 Q gi|254780451|r 59 TVTKEQIHAFVKWLDNKGTVESEVSYRFSRVLMQDFTGVPAVVDLAAMRDAIV----VLGGDPQNINPLVPVDLVIDHSL 134 (896) Q Consensus 59 ~~~~~~~~~~~~w~~~~~~~~~ei~f~p~Rv~~qD~Tg~pa~vdlaamR~~~~----~~g~dp~~inp~vp~dlviDHsv 134 (896) T Consensus 2 TL~EKILS~kvG~---~V~aGE~V~v~VD~am~hDGt~p~~i---~~l~~~g~rGG~~~v~~p~k------~v~~fDH~~ 69 (431) T TIGR02086 2 TLAEKILSEKVGR---PVEAGEIVEVEVDLAMAHDGTGPLAI---KALRELGERGGMAKVEDPEK------IVIVFDHVV 69 (431) T ss_pred CHHHHHHHHHCCC---CCCCCCEEEEECCEEEEECCCHHHHH---HHHHHHHHCCCCCCCCCCCE------EEEEEECCC T ss_conf 6477888985679---87886579970259999648717899---99999973478676646864------899982688 Q ss_pred HHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCEEE-ECCCCCCHHHHHHHHHCCCEEEECCCCCEEEEEEEE-E Q ss_conf 11005998899989998875426789999877421488078-608876216778986335113103688617983013-2 Q gi|254780451|r 135 IVDYSGNKDAVTRNKDLEYQRNEERYRFLKWGQKSFKNFRV-VPPGTGICHQINLEYLGQSVWTKNENGENIAYPDTC-V 212 (896) Q Consensus 135 ~vd~~g~~~a~~~n~~~e~~rN~Ery~Flkwa~~~f~~~~v-~pPG~GI~HQvnlE~la~vv~~~~~~~~~~a~Pdtl-V 212 (896) T Consensus 70 P~~~--v~~A~~Q~~~REF~K------------~--~gI~~f~~~g~GIcHQ~L~E-------------~Gya~PG~vvv 120 (431) T TIGR02086 70 PAPT--VEAAELQKEIREFAK------------R--HGIKVFFDVGEGICHQVLVE-------------KGYAEPGMVVV 120 (431) T ss_pred CCCC--HHHHHHHHHHHHHHH------------H--CCCCEEEECCCEEEEEEEEE-------------CCCCCCCEEEE T ss_conf 9965--677887789998887------------6--68705998798027788653-------------06247761899 Q ss_pred ECCCCCCCCCCCHHHHCCCCHHHHHH-HHCCCCCEECCCCEEEEEEECCCCCCCCHHHHHHHHHHHHCCCCCCCEEEEEE Q ss_conf 06887644452012320343489999-97077514116728999997677864436889999999841022121279996 Q gi|254780451|r 213 GTDSHTTMINALGILGWGVGGIEAEA-AMLGCPISMLLPEVVGFEVTGSLQEGVTATDLVLTITQMLRKEGVVSKFVEFF 291 (896) Q Consensus 213 GtDSHT~~~galG~la~GVGg~eaea-~mlGqp~~~~vPevigv~L~G~L~~gVtakDiiL~i~~~Lr~~Gvvgk~vEf~ 291 (896) T Consensus 121 G~DSHT~T~GA~GAFA~GmGATDvA~a~~~G~-~W~~VPe~~~V~~~G~l~~~v~AKDv~L~~~~~lg~~gatY~a~E~~ 199 (431) T TIGR02086 121 GADSHTCTSGALGAFATGMGATDVAIALATGK-TWLKVPESIKVVVEGKLEEGVTAKDVALEIVGELGADGATYMAIEFF 199 (431) T ss_pred ECCCCCCHHHCHHHEEECCCHHHHHHHHHHCC-CEEECCEEEEEEEEECCCCCEEHHHHHHHHHHHHCCCCCCCCEEEEC T ss_conf 52677400000023042578689999998286-13645808999987216986022488989999848787640169870 Q ss_pred ECC-CCCCCHHHHHHHHCCCCCCCCCEEEECCCHHHHHHHHHCC-CCHHHHHHHHHHHHHHHCCCCCCCCCCCCCCEEEE Q ss_conf 155-0017875632120001003720377519989999998639-99889999998746410236767667886306999 Q gi|254780451|r 292 GSG-FESMVLADRATIANMAPEYGATCGFFPVDRGTIDYLRLSG-RSNSRVDLVEAYTKVQGMWREDIDYEKVAFTKKMK 369 (896) Q Consensus 292 G~g-i~~LS~~dRaTIaNMa~E~GAt~gifp~De~T~~YL~~tG-R~~~~v~lve~Y~ka~~l~~~~~~d~~a~Y~~vie 369 (896) T Consensus 200 g~~G~e~m~~~~RlTl~NmavE~GAK~g~~~p~e~~~eY~k~~~g~~Dediakl~e-------~r~~~~d~~a~Y~~eie 272 (431) T TIGR02086 200 GLPGIEAMSVDERLTLCNMAVEAGAKAGLVEPDEETLEYLKKRRGEEDEDIAKLKE-------FRILKPDPDAKYEDEIE 272 (431) T ss_pred CCCCCCCCCCCCCEEEECCCCEECCCEEEECCCCCHHHHHHCCCCCCHHHHHHHCC-------CCEEECCCCCCCCEEEE T ss_conf 67783015777631102000000562464358873345653047884246765311-------54110488886121789 Q ss_pred EECCCCCCHHCCCCCCCCEEEHHHHHHHHHHHHHHHCCCHHHHHHHCCCCCCCCCCCCCCEEEEEEECCCCCCCHHHHHH Q ss_conf 98031430122656656413677730116687664001100232102457888887555445753104676545999877 Q gi|254780451|r 370 LDLGNVSPSVAGPRRPESRLSLSEVPSSFVTEMNEYYKKSHTLDEKYPVKGCDFHLKHGDVAIASITSCTNTFNPSVMIG 449 (896) Q Consensus 370 iDLs~ieP~VAgP~~P~d~v~l~~v~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~l~~g~VvIAaIgSCTNtSnp~~mia 449 (896) T Consensus 273 iD~~~LeP~Va~Ph~VDNV~~V~~VeGe-----------k~------------------~iDqVFiGSCTNGR~~Dl~~A 323 (431) T TIGR02086 273 IDLSDLEPLVAVPHSVDNVKPVSDVEGE-----------KT------------------KIDQVFIGSCTNGRLEDLRIA 323 (431) T ss_pred EECCCCCCEEECCCCCCCCEECCEEECC-----------EE------------------EEEEEEECCEECCCHHHHHHH T ss_conf 8636888720048748777351004075-----------55------------------884789702003408999999 Q ss_pred HHHHHHHHHHCCCC-CCCCCEEEEECCCHHHHHHHHHCCCHHHHHHHCCEECCCCCCCCCC-CCCCCCCHHHHHCCCCCE Q ss_conf 88999889864987-5867307970161899999998588577775053020553224212-777688302210113663 Q gi|254780451|r 450 AGLLARNAVRAGLK-SKPWVKTSCAPGSQVSYEYLVQAGLVEYLEALGFSLVGFGCTTCIG-NSGALKKEISEVIHQKSL 527 (896) Q Consensus 450 AgllAkkAv~~Glk-v~p~Vkt~l~PGS~~V~~~L~~~Gll~~L~~aGf~i~~~GCg~CiG-nsG~l~~~i~~~i~~~~l 527 (896) T Consensus 324 aeiL------~g~~GvH~dVR~iV~PAS~~V~~~A~e~G~i~~lv~aGa~i~~PGCGPCLG~HmGVLg~--------gE- 388 (431) T TIGR02086 324 AEIL------KGRRGVHPDVRLIVVPASRKVYEKALEEGIIETLVEAGAIICPPGCGPCLGAHMGVLGD--------GE- 388 (431) T ss_pred HHHH------CCCCCCCCCEEEEEECHHHHHHHHHHHHHHHHHHHHCCEEEECCCCCCCCCCCCCEECC--------CC- T ss_conf 9984------13788576303898201478899998741788887493588072387434331567268--------98- Q ss_pred EEEEEECCCCCCCCCCCCCCCCEEECCHHHHHHHHHHCCCCCCCCCCCC Q ss_conf 5878633676666546854331000597899999851612223100235 Q gi|254780451|r 528 VVAGVLSGNRNFEGRISPDVEANYLLSPPLVVAYALAGNVRKNLIKDPI 576 (896) Q Consensus 528 ~~~sV~SgNRNFeGR~~p~~~~~yLaSP~lVvA~AiaG~I~~d~~~dpl 576 (896) T Consensus 389 --v~~ST~NRNF~GRMG~~~a~IYLASP~vAA~SA~~G~i-----T~P~ 430 (431) T TIGR02086 389 --VCVSTTNRNFKGRMGSPDAEIYLASPAVAAASAVEGYI-----TDPR 430 (431) T ss_pred --EEEECCCCCCCCCCCCCCCCEEECCHHHHHHHHHCCCC-----CCCC T ss_conf --89973478888888687662781675898885632211-----1889

HHsearch alignment for GI: 254780451 and conserved domain: TIGR02086