>TIGR00856 pyrC_dimer dihydroorotase, homodimeric type; InterPro: IPR004721 Dihydroorotase belongs to MEROPS peptidase family M38 (clan MJ), where it is classified as a non-peptidase homologue. DHOase catalyses the third step in the de novo biosynthesis of pyrimidine, the conversion of ureidosuccinic acid (N-carbamoyl-L-aspartate) into dihydroorotate. Dihydroorotase binds a zinc ion which is required for its catalytic activity . In bacteria, DHOase is a dimer of identical chains of about 400 amino-acid residues (gene pyrC). In the metazoa, DHOase is part of a large multi-functional protein known as 'rudimentary' in Drosophila melanogaster and CAD in mammals and which catalyzes the first three steps of pyrimidine biosynthesis . The DHOase domain is located in the central part of this polyprotein. In yeast, DHOase is encoded by a monofunctional protein (gene URA4). However, a defective DHOase domain is found in a multifunctional protein (gene URA2) that catalyzes the first two steps of pyrimidine biosynthesis. The comparison of DHOase sequences from various sources shows that there are two highly conserved regions. The first located in the N-terminal extremity contains two histidine residues suggested to be involved in binding the zinc ion. The second is found in the C-terminal part. Members of this family of proteins are predicted to adopt a TIM barrel fold . This family represents the homodimeric form of dihydroorotase 3.5.2.3 from EC. It is found in bacteria, plants and fungi; URA4 of yeast is a member of this group of sequences. ; GO: 0004151 dihydroorotase activity, 0019856 pyrimidine base biosynthetic process.

Probab=100.00 E-value=0 Score=508.06 Aligned_cols=340 Identities=49% Similarity=0.887 Sum_probs=325.3 Q ss_pred EEEECCCCEEEEECCCHHHHHHHHHHHCC-CCEEEEECCCCCCCCCCHHHHHHHHHHHHHHCCCCCEEEEEEEEEECCCC Q ss_conf 55864664237508817889874987418-87399983895148989899999999999838688469950134527899 Q gi|254781012|r 3 KISLRVPDDWHLHLRDGEILKTVLRDTAK-NFRRALVMPNIDPPIITVDDACAYRQRILNALPPEYDFSPLMTIYLTETT 81 (349) Q Consensus 3 ~l~lp~~~D~HvH~Reg~~~~~t~aa~aG-G~TtV~~MPNT~Ppi~t~e~~~~~~~r~~~~~~~~~~~~~~~~~~lt~~~ 81 (349) T Consensus 1 ~l~l~~p~D~HlHvRega~lk~V~P~~~~~Gfs~A~iMPNL~pP~~~~~~~~~Y~~~il~~~p~G~~f~pLMslYL~d~l 80 (364) T TIGR00856 1 ELTLGRPDDWHLHVREGAMLKAVLPYTSEGGFSRAIIMPNLKPPVTTVDRAIEYRERILKAVPAGGDFTPLMSLYLTDDL 80 (364) T ss_pred CCCCCCCCCEEEECCCHHHHHHCCCCCCCCCEEEEEECCCCCCCCCCHHHHHHHHHHHHHHCCCCCCCCCEEEEEECCCC T ss_conf 90005777506534702355214773113651489977888777478788999999999855588985621466416898 Q ss_pred CHHHHHHHHHCCCEEEHHHCCCCCEECCCCCCCH--HHHHHHHHHHHHHCCCCEECCCCCCC---CC---CCCHHHHHHH Q ss_conf 9889987440687210221045510025654100--68899999999873982220257555---55---4300146765 Q gi|254781012|r 82 DPDDVEKGFTSQLVQAIKLYFAGSTTNSHHGIRN--IDRVMPVLERMETIGMPLCIHGEILN---QD---IDIFDRELMF 153 (349) Q Consensus 82 ~~~~~~~~~~~~~~~~~k~~~~~~~~~~~~~v~~--~~~~~~~le~~~~~~~~i~~H~E~~~---~~---~~~~~~E~~~ 153 (349) T Consensus 81 ~p~el~~A~~~~~v~~~K~YPaG~TTNs~~Gv~~~~~~~~~~vL~~m~~~~l~L~~HgE~t~vhdgdkePI~~ld~E~~f 160 (364) T TIGR00856 81 TPEELEEAKEKHAVRAVKLYPAGATTNSAAGVTDLLIEAILPVLEAMQKVGLPLLLHGEVTSVHDGDKEPIDILDREELF 160 (364) T ss_pred CHHHHHHHHHCCCEEEEEECCCCCCCCHHCCCCHHHHHHHHHHHHHHHHCCCEEEECCCCCCCCCCCCCCCCHHCHHHHH T ss_conf 98899989754964899725888620511168713467899999988762983663167776556788753210354676 Q ss_pred HHHHHHHHHHHHCCCEEEEECCCHHHHHHHHHHCCC---------CCEEEECCCCCCCHHHHHCCCCCCCEEECCCCCCH Q ss_conf 457899999620695399705785899999870573---------32023023100397886137888311321346999 Q gi|254781012|r 154 IDKILDPLRNKLPNLKIILEHITTSNGIDYVNNATN---------IAGSITVHHLIINRNAIFHDGLNPHYYCLPIPKRE 224 (349) Q Consensus 154 ~~~~l~~~~a~~~~~~iHi~HiST~~sv~lir~ak~---------vtaEVTPHHL~lt~~d~~~~~~~~~~k~nPPlR~~ 224 (349) T Consensus 161 ~~~~L~~L~~~fP~LkiilEH~t~~~ai~~i~~~n~~vkkatdvk~aATlT~~HL~~~~d~l~~Gg~~Ph~fCkP~~K~~ 240 (364) T TIGR00856 161 IEKVLEPLREKFPKLKIILEHITTEDAIKLIEDINNRVKKATDVKLAATLTPHHLLFTRDDLLGGGVNPHLFCKPILKRK 240 (364) T ss_pred HHHHHHHHHHHCCCCEEEEEECCCHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCH T ss_conf 89998999862776418998529889999998640001012101131031077887307888259857501166524685 Q ss_pred HHHHHHHHHHHCCCCEEEEECCCCCCCHHHHHCCC-CCCCCCCHHHHHHHHHHHHHCCCCHHHHHHHHHHCCHHHCCCCC Q ss_conf 99999999997699418971388865313321545-77544543679999999972069999999998243178818898 Q gi|254781012|r 225 KHRLSLRKAALSGNPRFFLGTDSAPHWDSSKESSC-GCAGIYTARNALNCLAQIFEEENKLENLESFVSINGATWYGIPV 303 (349) Q Consensus 225 ~dr~aL~~ai~~G~i~d~I~TDHAPH~~eeK~~~~-~~~g~~~~~~~~~~~~~~~~~~~~L~~l~~~~s~npa~~~gl~~ 303 (349) T Consensus 241 ~d~~~L~~~a~sg~P~~flGsDSAPH~~~~K~s~~G~CAG~ysa~~al~~~A~~FE~~NAL~~L~AF~S~~g~~fY~l~~ 320 (364) T TIGR00856 241 KDQKALLKLAVSGKPKFFLGSDSAPHARSKKESACGGCAGVYSAPIALPAYAEVFEEVNALENLEAFVSDNGPSFYGLPD 320 (364) T ss_pred HHHHHHHHHHHHCCCCEEECCCCCCCHHCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHCCHHHCCEEEEECCCCCCCCCC T ss_conf 66899999987179825526787642120664446846101027789999999986406053146356522641025664 Q ss_pred C----CCEEEEEECCCCEEECHHHCCCC-CCEEECCCCEEECCEEE Q ss_conf 8----85289994797178471122677-77146579769833888 Q gi|254781012|r 304 N----TRKISLKRREQPIIFDEKITTST-GSITIFNPIFPLYWEVM 344 (349) Q Consensus 304 ~----~~~i~l~d~~~~~~v~~~~~~sk-~~~tpF~~g~~l~w~V~ 344 (349) T Consensus 321 nev~~~~~~~L~k--~e~~iP~~~~~~~d~~l~pl~AGe~l~W~~~ 364 (364) T TIGR00856 321 NEVLSSKKARLVK--KEQVIPEEISLLEDEKLVPLRAGETLSWSVR 364 (364) T ss_pred CCCCCHHHHHHCC--CCCCCHHHCCCCCCCCEEEECCCCEEEEECC T ss_conf 2337401421012--6651502216788662667527874775109

HHsearch alignment for GI: 254781012 and conserved domain: TIGR00856