>TIGR00857 pyrC_multi dihydroorotase, multifunctional complex type; InterPro: IPR004722 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 higher eukaryotes, 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 yeasts, 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 . Dihydroorotase 'multifunctional complex type' 3.5.2.3 from EC, in contrast to the homodimeric type of dihydroorotase found in Escherichia coli, tends to appear in a large multifunctional complex with aspartate transcarbamoylase. Homologous domains appear in multifunctional proteins of higher eukaryotes. In some species, including Pseudomonas putida and Pseudomonas aeruginosa, this protein is inactive but is required as a non-catalytic subunit of aspartate transcarbamoylase (ATCase). In these species, a second, active dihydroorotase is also present..

Probab=100.00 E-value=4.2e-45 Score=308.48 Aligned_cols=409 Identities=36% Similarity=0.506 Sum_probs=315.5 Q ss_pred EEEEEEEE----CCEEEEECCCCCCCCCCCCCEEEECCCCEEECCEEECCCCCCCCCCCCCCCHHHHHHHHHCCCCCCCC Q ss_conf 00108997----99999831786556667887799887988951727141147899983114378899998707873212 Q gi|254780301|r 20 EVGAIIVE----NGIILAAGADALNAKFPTSALIHDCTGLVAVPGIIDARVTLTGSPDEYSKNITTLSKEAVAGGITSII 95 (431) Q Consensus 20 ~~~~I~I~----~gkI~~Ig~~~~~~~~~~~~~vID~~G~~v~PGlID~H~Hl~~~~~~~~~~~~~~~~~~~~~~~~~~~ 95 (431) T Consensus 4 ~~~di~V~~Gvd~g~I~~i~~~~--~~~~~~~~vi~~~g~lvlPG~iD~HVHlRdpg~eyKEdi~~G~~AA~~GG~t~V~ 81 (459) T TIGR00857 4 VEVDILVESGVDDGKIKKIGDDK--LRIKADAEVIDAKGLLVLPGLIDLHVHLRDPGEEYKEDIESGSKAAIHGGFTTVA 81 (459) T ss_pred EEEEEEEEECCCCCEEEEECCCC--CCCCCCCEEECCCCCEECCCCEEEEEECCCCCCCCHHHHHHHHHHHHCCCEEEEE T ss_conf 55568997436898578853777--5578764155477747806004777621889874113188999997558715899 Q ss_pred CCCCCCCCCCCCHHHHHHHHHHHHHH---------------------CCCCCCCCEECCCCCCCC--CCCCCCCCCCCCC Q ss_conf 45455664333166777767766431---------------------012232100013443222--2222100000112 Q gi|254780301|r 96 LMPLGMSSFLDEYTFIKYALEEIRVK---------------------SLINVYPTACLTSNMEGK--EISEMRLLQEQGI 152 (431) Q Consensus 96 ~~~~~~~~~~~~~~~~~~~~~~~~~~---------------------~~~~~~~~~~~~~~~~~~--~~~~~~~~~~~~~ 152 (431) T Consensus 82 dMPNT~PP~d~~~~~~~~~~~~~~~~GvnahhqPPGdPqaenrPdsa~vd~~~~~~vt~~~~gk~~~~~~~~~~~~~~~~ 161 (459) T TIGR00857 82 DMPNTKPPIDTPETLERKLQRLKKKSGVNAHHQPPGDPQAENRPDSALVDVLLYAGVTKGNKGKEIVRLTEAYELKEAGA 161 (459) T ss_pred ECCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCEEEEEEEEEEECCCCCCCEEEECCHHHHHCCCE T ss_conf 85743137789899999999741014642346855587535588852554578645704445551011125056510643 Q ss_pred C--CCCCCCCCCCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCC-CCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHH Q ss_conf 2--223433322221101245676542101222233322222221-1246753100122221000012355556654320 Q gi|254780301|r 153 V--SFIQSPMSIHDTQVLLNSMKYAHMLNAIVALDTHDHFLGSRG-VINEGIIANYLGLVGIPSISETVPLARDLLIAQH 229 (431) Q Consensus 153 ~--~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 229 (431) T Consensus 162 ~G~~F~~d~~~~~~~~~~~~~le~a~~~Gv~~~~HaE~~~l~~~~~~~~~~~~~~~~gl~~rp~~aE~~~va~~~~l~~~ 241 (459) T TIGR00857 162 VGEVFIDDGSEVLDILSMRKALEYAAELGVLIVLHAEDPDLIAGGLVEYEGRSAAALGLKARPPEAEEVAVARLLELAKH 241 (459) T ss_pred EEEEEEECCHHHHHHHHHHHHHHHHHHCCCEEEEECCCHHHHCCCCCCCCCCCCHHHCCCCCCCHHHHHHHHHHHHHHHH T ss_conf 68987645523420345678999885579369982588677326742122332475367888203379999999999986 Q ss_pred CCCC-----CCCCCCCCHHHHHHHHHHHCC--CCCCCCCCCCCCCCCCCCCCCC--------CCCCCCCCCCCCCCCCCC Q ss_conf 0011-----122233311211001111001--2223222222222223222211--------100000011122222222 Q gi|254780301|r 230 TGGH-----YHASVISIPQSIALIKHAKAH--NTKATCGISINNLILNENDVEM--------YNSLRKVLPPLRSETERM 294 (431) Q Consensus 230 ~~~~-----~~~~~~~~~~~~~~~~~~~~~--~~~~~~~~~~~~~~~~~~~~~~--------~~~~~~~~~~~~~~~~~~ 294 (431) T Consensus 242 ~g~~nkkPhvHicHiSTk~~~~~i~~~k~~~~Gi~~T~EVtPHHLlL~~~~~~~GlPPhtP~~~~~~kvNPPLR~~eDr~ 321 (459) T TIGR00857 242 AGCPNKKPHVHICHISTKESLELIKKAKKQLKGIKITAEVTPHHLLLSEEDVARGLPPHTPPLDTNLKVNPPLREEEDRL 321 (459) T ss_pred CCCCCCCCCEEEEEEECCHHHHHHHHHHHHCCCCEEEEEECCCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCCCCHHHHH T ss_conf 18888888436998650015889998764004623899846730017868882688788888888501377988853599 Q ss_pred CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHCC-CCCHHHHHHHHHHHHHHHCCCCC-C Q ss_conf 222223344311113444545432222343332222222101367888676516-98999999988151799809999-7 Q gi|254780301|r 295 SMVEALEKGDIDIIVSDHTPRHMDTKLLPFAEASFGSIGLETMLSAALRLFHGQ-QISLKKLIRALSTRPAQIFNLPG-G 372 (431) Q Consensus 295 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-gls~~eal~~aT~npA~~lgl~~-G 372 (431) T Consensus 322 aL~~~~~~G~ID~iAsDHAPH~~eEK~~~~~~appG~pgle~~~p~~l~~~~kg~lis~~~~~~~~s~nParIfgl~~~G 401 (459) T TIGR00857 322 ALIEGLKDGIIDIIASDHAPHTLEEKLKEVAAAPPGIPGLETVLPLLLQLLVKGNLISLKDLVRMLSINPARIFGLPDKG 401 (459) T ss_pred HHHHHHHCCCCCEEECCCCCCCHHHHHCCHHHCCCCCCHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHCCHHHCCCCCCC T ss_conf 99776634720178557864212655021554678873388899999999754873268999999852655112279877 Q ss_pred EECCCCCCCEEEECCCCCEEECHHHHHCCCCCCCCCCEEEEEEEEEEEECCEEEEEEC Q ss_conf 2466872678998698978853778520248865677278228899999999998624 Q gi|254780301|r 373 TLQTGTAADIALIDLNYQWTVKADDMSSIHKNTVFDKEFFTGKVVRTYISGKQVYTLE 430 (431) Q Consensus 373 ~I~~Gk~ADlvi~D~~~~~~i~~~~~~s~~~~tp~~g~~~~g~V~~tiv~G~iVy~~e 430 (431) T Consensus 402 ~l~~G~~Ad~tv~Dl~k~~~i~~e~f~sKa~~TPf~G~~~~g~p~~Ti~rGk~~~~~~ 459 (459) T TIGR00857 402 TLEEGNPADLTVIDLKKEWTIKAETFYSKAKNTPFEGMSLKGKPIATILRGKVVYEDG 459 (459) T ss_pred CCCCCCCCCEEEECCCHHCEEEHHHCCCCCCCCCCCCEEECCEEEEEEEEEEEEEECC T ss_conf 4136797762378741000530101432213775667446473589998018876219

HHsearch alignment for GI: 254780301 and conserved domain: TIGR00857