>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=96.57 E-value=0.0087 Score=39.26 Aligned_cols=249 Identities=16% Similarity=0.158 Sum_probs=133.2 Q ss_pred EEEEECCCCCH--HHHCCHHHHHHHHHHCCCCEEEEEC------CCHHHHHHHHHHHHHCC----------------CCC Q ss_conf 16861388875--6522689999999986998999916------79877899999998557----------------233 Q gi|254780215|r 2 LIDTHCHLLLP--DFDEDRHDVIMRAHQANVLKMIAIA------IKVKDFVPLIKLCQDYP----------------SSI 57 (262) Q Consensus 2 ~iD~H~HL~~~--~~~~d~~~~i~~a~~~gv~~~i~~~------~~~~~~~~~~~l~~~~p----------------~~i 57 (262) T Consensus 47 ~iD~HVHlRdpg~eyKEdi~~G~~AA~~GG~t~V~dMPNT~PP~d~~~~~~~~~~~~~~~~GvnahhqPPGdPqaenrPd 126 (459) T TIGR00857 47 LIDLHVHLRDPGEEYKEDIESGSKAAIHGGFTTVADMPNTKPPIDTPETLERKLQRLKKKSGVNAHHQPPGDPQAENRPD 126 (459) T ss_pred CEEEEEECCCCCCCCHHHHHHHHHHHHCCCEEEEEECCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCC T ss_conf 04777621889874113188999997558715899857431377898999999997410146423468555875355888 Q ss_pred CCCCCCCCCCCCCCCHHHHHH---HHHHCCCCCCCEECCCCCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCEEECHHH- Q ss_conf 211244544334467889988---5310013332100446775533221110246789999876642044203300023- Q gi|254780215|r 58 FCSVGTHPCHAHEENEVLVDE---LVCLASHPRVVAIGETGLDRYHNAHTIEEQKVVFLRHIEASRITGIPLVIHSRSA- 133 (262) Q Consensus 58 ~~a~GiHP~~~~~~~~~~~~~---l~~l~~~~~~~aIGEiGLD~~~~~~~~e~Q~~vF~~ql~lA~e~~~pv~iH~r~a- 133 (262) T Consensus 127 sa~vd~~~~~~vt~~~~-gk~~~~~~~~~~~~~~~~~G~~F~----~d~~~~~~~~~~~~~le~a~~~Gv~~~~HaE~~~ 201 (459) T TIGR00857 127 SALVDVLLYAGVTKGNK-GKEIVRLTEAYELKEAGAVGEVFI----DDGSEVLDILSMRKALEYAAELGVLIVLHAEDPD 201 (459) T ss_pred CCEEEEEEEEEEECCCC-CCCEEEECCHHHHHCCCEEEEEEE----ECCHHHHHHHHHHHHHHHHHHCCCEEEEECCCHH T ss_conf 52554578645704445-551011125056510643689876----4552342034567899988557936998258867 Q ss_pred --------------------------H----HHHHHHHHHHHHC-CCCCCCC-EECC-CCHHHHHHHHCC--CCE--EEC Q ss_conf --------------------------3----3579998531000-3675331-1214-640234432103--520--202 Q gi|254780215|r 134 --------------------------D----DDMAAILQEEMKK-GPFPFVI-HCFS-SSQKLADICLEL--GGY--ISF 176 (262) Q Consensus 134 --------------------------~----~~~l~iL~~~~~~-~~~~~i~-H~Fs-G~~~~~~~~l~~--g~y--~S~ 176 (262) T Consensus 202 l~~~~~~~~~~~~~~~~gl~~rp~~aE~~~va~~~~l~~~~g~~nkkPhvHicHiSTk~~~~~i~~~k~~~~Gi~~T~EV 281 (459) T TIGR00857 202 LIAGGLVEYEGRSAAALGLKARPPEAEEVAVARLLELAKHAGCPNKKPHVHICHISTKESLELIKKAKKQLKGIKITAEV 281 (459) T ss_pred HHCCCCCCCCCCCCHHHCCCCCCCHHHHHHHHHHHHHHHHCCCCCCCCCEEEEEEECCHHHHHHHHHHHHCCCCEEEEEE T ss_conf 73267421223324753678882033799999999999861888888843699865001588999876400462389984 Q ss_pred CCC-CCHHH--HHH--------HHHHHHCCCC-----CCE------------EEEEC-CCCCCCCCCCCCCCC-H----- Q ss_conf 332-21133--322--------3333210566-----717------------98307-866787776887588-2----- Q gi|254780215|r 177 TGM-ITFPK--YDA--------LRAIARGIPM-----DRV------------LVETD-SPYIVPVSCQGKRNE-P----- 221 (262) Q Consensus 177 ~g~-i~~~~--~~~--------~~e~v~~iPl-----dri------------LlETD-sP~l~p~~~r~~~n~-P----- 221 (262) T Consensus 282 tPHHLlL~~~~~~~GlPPhtP~~~~~~kvNPPLR~~eDr~aL~~~~~~G~ID~iAsDHAPH~~eEK~~~~~~appG~pgl 361 (459) T TIGR00857 282 TPHHLLLSEEDVARGLPPHTPPLDTNLKVNPPLREEEDRLALIEGLKDGIIDIIASDHAPHTLEEKLKEVAAAPPGIPGL 361 (459) T ss_pred CCCCCCCCHHHHHCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCCEEECCCCCCCHHHHHCCHHHCCCCCCHH T ss_conf 67300178688826887888888885013779888535999977663472017855786421265502155467887338 Q ss_pred -HHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHH Q ss_conf -4499999999987289989999999999999842 Q gi|254780215|r 222 -AYVVNTAKALAKEKDVSYEDLMEETTKNALKLFS 255 (262) Q Consensus 222 -~~i~~~~~~iA~i~~~~~eei~~~~~~N~~~~f~ 255 (262) T Consensus 362 e~~~p~~l~~~~kg~lis~~~~~~~~s~nParIfg 396 (459) T TIGR00857 362 ETVLPLLLQLLVKGNLISLKDLVRMLSINPARIFG 396 (459) T ss_pred HHHHHHHHHHHHCCCCCCHHHHHHHHHHCCHHHCC T ss_conf 88999999997548732689999998526551122

HHsearch alignment for GI: 254780215 and conserved domain: TIGR00857