>cd02810 DHOD_DHPD_FMN Dihydroorotate dehydrogenase (DHOD) and Dihydropyrimidine dehydrogenase (DHPD) FMN-binding domain. DHOD catalyzes the oxidation of (S)-dihydroorotate to orotate. This is the fourth step and the only redox reaction in the de novo biosynthesis of UMP, the precursor of all pyrimidine nucleotides. DHOD requires FMN as co-factor. DHOD divides into class 1 and class 2 based on their amino acid sequences and cellular location. Members of class 1 are cytosolic enzymes and multimers while class 2 enzymes are membrane associated and monomeric. The class 1 enzymes can be further divided into subtypes 1A and 1B which are homodimers and heterotetrameric proteins, respectively. DHPD catalyzes the first step in pyrimidine degradation: the NADPH-dependent reduction of uracil and thymine to the corresponding 5,6-dihydropyrimidines. DHPD contains two FAD, two FMN and eight [4Fe-4S] clusters, arranged in two electron transfer chains that pass its homodimeric interface twice. Two of

Probab=97.66 E-value=0.00034 Score=47.15 Aligned_cols=144 Identities=15% Similarity=0.197 Sum_probs=93.3 Q ss_pred CCCCEEEEEEEEEECCHH---HHHHCCCCCCEEEEECCC------------CCCHHHHHHHHHHCCCE-EEEEEECCCCH Q ss_conf 256416856788512033---676404776079997066------------42158999867764982-59985233344 Q gi|254780975|r 60 YSDSVFDCHLMISSIDSH---INIIADAGCDIITFHPES------------SPHIRRSLRTIHAMGKK-TGVAINPETPV 123 (224) Q Consensus 60 ~t~~~~dvHLMv~~P~~~---i~~~~~~g~d~i~~H~E~------------~~~~~~~i~~i~~~g~k-~Giai~p~T~~ 123 (224) T Consensus 96 ~~~~pli~Si~~~~~~~~~~~a~~~~~~gad~lElNiScPn~~~~~~~~~~~~~~~~i~~~v~~~~~~Pv~vKLsp~~~~ 175 (289) T cd02810 96 FPGQPLIASVGGSSKEDYVELARKIERAGAKALELNLSCPNVGGGRQLGQDPEAVANLLKAVKAAVDIPLLVKLSPYFDL 175 (289) T ss_pred CCCCEEEEECCCCCHHHHHHHHHHHHHHCCCEEEEEEECCCCCCCCCCCCCHHHHHHHHHHHHHCCCCCEEEECCCCCCH T ss_conf 79953999788898789999999999847984899840367565532014999999999999860268748842788761 Q ss_pred HHHHHHHHH-----CCEEEEE-E-----------------EECCCCCCCCCCHHHHHHHHHHHHHHCCCCEEEEECCCC- Q ss_conf 789988620-----1402899-8-----------------306776533220135778998654313865269815899- Q gi|254780975|r 124 AILEDVIDE-----IDMILIM-T-----------------VNPGFGGQQLIESTIPKIRQAKALIGKRSISLEVDGGVT- 179 (224) Q Consensus 124 ~~i~~~l~~-----~D~vliM-~-----------------V~PG~~Gq~f~~~~l~kI~~l~~~~~~~~~~I~vDGGvn- 179 (224) T Consensus 176 ~~~~~ia~~~~~~ga~gv~~~Nt~~~~~~~~~~~~~~~~~~~gGlSG~~i~~~al~~v~~~~~~~~-~~i~Iig~GGI~~ 254 (289) T cd02810 176 EDIVELAKAAERAGADGLTAINTISGRVVDLKTVGPGPKRGTGGLSGAPIRPLALRWVARLAARLQ-LDIPIIGVGGIDS 254 (289) T ss_pred HHHHHHHHHHHHCCCCEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHCC-CCCEEEEECCCCC T ss_conf 689999999997599689996787765554444554456776523662778899999999999749-9960999899399 Q ss_pred HHHHHHHHHCCCCEEEECHHHHCC-C Q ss_conf 889999996799899974266378-9 Q gi|254780975|r 180 SRNIKSLVQAGADLLVVGSSFFNQ-K 204 (224) Q Consensus 180 ~~~i~~l~~~Gad~~V~Gsaif~~-~ 204 (224) T Consensus 255 ~~da~e~i~aGA~~Vqv~Tal~~~Gp 280 (289) T cd02810 255 GEDVLEMLMAGASAVQVATALMWDGP 280 (289) T ss_pred HHHHHHHHHCCCCHHHHHHHHHHHCH T ss_conf 99999999849979999899997586

HHsearch alignment for GI: 254780975 and conserved domain: cd02810