>TIGR02083 LEU2 3-isopropylmalate dehydratase, large subunit; InterPro: IPR011823 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) 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=684.03 Aligned_cols=405 Identities=30% Similarity=0.441 Sum_probs=341.7 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 2 T~~~KILa~~AG~--~~V~pg~l~~~~~D~~lgND~TtP~Aik~Fk---~~g~~KV~d~~~------~~~V~DHFtP--- 67 (419) T TIGR02083 2 TLAEKILADKAGL--EEVEPGELILAKLDLVLGNDVTTPLAIKAFK---EIGVKKVFDKDK------VALVLDHFTP--- 67 (419) T ss_pred CHHHHHHHHHCCC--CCCCCCCEEEEECCEEEECCCCCHHHHHHHH---HCCCEECCCCCC------EEEEECCCCC--- T ss_conf 4245678644251--4457565776512410206665157999898---606500104661------7897157898--- Q ss_pred CCCHH---HHHHHHHHHHHHHHHHHHHHHHHHHHCCCEEEECCCC-CCHHHHHHHHHCCCEEEECCCCCEEEEEE-EEEE Q ss_conf 59988---9998999887542678999987742148807860887-62167789863351131036886179830-1320 Q gi|254780451|r 139 SGNKD---AVTRNKDLEYQRNEERYRFLKWGQKSFKNFRVVPPGT-GICHQINLEYLGQSVWTKNENGENIAYPD-TCVG 213 (896) Q Consensus 139 ~g~~~---a~~~n~~~e~~rN~Ery~Flkwa~~~f~~~~v~pPG~-GI~HQvnlE~la~vv~~~~~~~~~~a~Pd-tlVG 213 (896) T Consensus 68 --NKDIK~A~~~k~~R~FA~~~~I~~ffe--------~-----G~~G~EH~L-------------lPE~G~v~~GdliiG 119 (419) T TIGR02083 68 --NKDIKAAEQCKMIREFAKEQGIEKFFE--------I-----GNMGVEHAL-------------LPEKGLVLPGDLIIG 119 (419) T ss_pred --CHHHHHHHHHHHHHHHHHHCCCHHHHC--------C-----CCCCEEEEE-------------CCCCCCEEECCEEEE T ss_conf --723567898899887665314223311--------5-----762135774-------------377773132667882 Q ss_pred CCCCCCCCCCCHHHHCCCCHHHHHHHHCCCCCEECCCCEEEEEEECCCCCCCCHHHHHHHHHHHHCCCCCCCEEEEEEEC Q ss_conf 68876444520123203434899999707751411672899999767786443688999999984102212127999615 Q gi|254780451|r 214 TDSHTTMINALGILGWGVGGIEAEAAMLGCPISMLLPEVVGFEVTGSLQEGVTATDLVLTITQMLRKEGVVSKFVEFFGS 293 (896) Q Consensus 214 tDSHT~~~galG~la~GVGg~eaea~mlGqp~~~~vPevigv~L~G~L~~gVtakDiiL~i~~~Lr~~Gvvgk~vEf~G~ 293 (896) T Consensus 120 ADSHTCTYGALGaF~TGVGSTD~Av~~~~G~aWF~VP~~IK~~l~G~~~~~V~~KD~iL~~Ig~iGVdGA~YK~~Ef~G~ 199 (419) T TIGR02083 120 ADSHTCTYGALGAFATGVGSTDLAVGMATGKAWFKVPEAIKFVLKGKLKPWVTGKDLILHIIGKIGVDGALYKSMEFSGE 199 (419) T ss_pred CCCCCCHHHHHHHHCCCCCHHHHHHHHHHCCEEEECCCEEEEEEECCCCCCCCHHHHHHHHHHHHCCCCCEEEEEEECCC T ss_conf 67652101200000046552777877651520463471689887146200022136777768773457310245664160 Q ss_pred CCCCCCHHHHHHHHCCCCCCCCCEEEECCCHHHHHHHHHCCCCHHHHHHHHHHHHHHHCCCCCCCCCCCCCCEEEEEECC Q ss_conf 50017875632120001003720377519989999998639998899999987464102367676678863069999803 Q gi|254780451|r 294 GFESMVLADRATIANMAPEYGATCGFFPVDRGTIDYLRLSGRSNSRVDLVEAYTKVQGMWREDIDYEKVAFTKKMKLDLG 373 (896) Q Consensus 294 gi~~LS~~dRaTIaNMa~E~GAt~gifp~De~T~~YL~~tGR~~~~v~lve~Y~ka~~l~~~~~~d~~a~Y~~vieiDLs 373 (896) T Consensus 200 g~~~ls~d~R~ti~NMAIEAGaK~Gi~~vD~~TI~Y~k--gR~~~~~~-------------~y~~D~DA~Y~~~~e~Dls 264 (419) T TIGR02083 200 GLKELSMDDRLTIANMAIEAGAKTGIFEVDEKTIEYVK--GRAKRELK-------------IYKADEDAKYERVIEIDLS 264 (419) T ss_pred HHEEEECCCCCHHHHHHHHHCCCCCCCCCCCHHHHHHC--CCCHHHHH-------------CCCCCCCCCEEEEEEEEHH T ss_conf 02003105520031345540666687562202321001--45401332-------------1477666414456552330 Q ss_pred CCCCHHCCCCCCCCEEEHHHHHHHHHHHHHHHCCCHHHHHHHCCCCCCCCCCCCCCEEEEEEECCCCCCCHHHHHHHHHH Q ss_conf 14301226566564136777301166876640011002321024578888875554457531046765459998778899 Q gi|254780451|r 374 NVSPSVAGPRRPESRLSLSEVPSSFVTEMNEYYKKSHTLDEKYPVKGCDFHLKHGDVAIASITSCTNTFNPSVMIGAGLL 453 (896) Q Consensus 374 ~ieP~VAgP~~P~d~v~l~~v~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~l~~g~VvIAaIgSCTNtSnp~~miaAgll 453 (896) T Consensus 265 ~~~p~VAfPhLP~Nt~~~~~~~k~-----------~i------------------kiDQvVIGSCTNGRleDlr~AA~iL 315 (419) T TIGR02083 265 ELEPQVAFPHLPENTKEIDEAGKE-----------EI------------------KIDQVVIGSCTNGRLEDLRLAAEIL 315 (419) T ss_pred HCCCCCCCCCCCCCCCCHHHHHHH-----------EE------------------EEEEEEECCCCCCCHHHHHHHHHHH T ss_conf 148610356685323325533111-----------12------------------2104898146676078999999985 Q ss_pred HHHHHHCCCCCCCCCEEEEECCCHHHHHHHHHCCCHHHHHHHCCEECCCCCCCCCC-CCCCCCCHHHHHCCCCCEEEEEE Q ss_conf 98898649875867307970161899999998588577775053020553224212-77768830221011366358786 Q gi|254780451|r 454 ARNAVRAGLKSKPWVKTSCAPGSQVSYEYLVQAGLVEYLEALGFSLVGFGCTTCIG-NSGALKKEISEVIHQKSLVVAGV 532 (896) Q Consensus 454 AkkAv~~Glkv~p~Vkt~l~PGS~~V~~~L~~~Gll~~L~~aGf~i~~~GCg~CiG-nsG~l~~~i~~~i~~~~l~~~sV 532 (896) T Consensus 316 ------~g~~v~~~~R~Ii~P~~~~vY~~a~~~Gl~~~Fi~AG~~vstPTCGPCLGGHMGiLA~--------gE---~a~ 378 (419) T TIGR02083 316 ------KGKKVAKDVRLIIIPGSQNVYLEALKEGLLEIFIEAGAVVSTPTCGPCLGGHMGILAE--------GE---RAV 378 (419) T ss_pred ------CCCEECCCCEEEEECCCHHHHHHHHHHHHHHHHHHCCCEECCCCCCCCCCCCHHHCCC--------CC---EEE T ss_conf ------4871357620899639817999998520688788678666676888767630210107--------87---467 Q ss_pred ECCCCCCCCCC-CCCCCCEEECCHHHHHHHHHHCCC Q ss_conf 33676666546-854331000597899999851612 Q gi|254780451|r 533 LSGNRNFEGRI-SPDVEANYLLSPPLVVAYALAGNV 567 (896) Q Consensus 533 ~SgNRNFeGR~-~p~~~~~yLaSP~lVvA~AiaG~I 567 (896) T Consensus 379 STTNRNFVGRMGH~~-S~VyLaSP~VAAASAi~G~i 413 (419) T TIGR02083 379 STTNRNFVGRMGHPK-SEVYLASPAVAAASAIKGKI 413 (419) T ss_pred EECCCCCCCCCCCCC-CEEEECCHHHHHHHHHCCCC T ss_conf 413766301457876-40674375688787524402

HHsearch alignment for GI: 254780451 and conserved domain: TIGR02083