>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=99.91 E-value=2.1e-22 Score=150.24 Aligned_cols=241 Identities=16% Similarity=0.113 Sum_probs=150.4 Q ss_pred EEECCEEECCCEEEECHHHHHHHHCHHHHHHHHHHHHHHCCEEE-CCCCHHH---------------------------- Q ss_conf 99898962568685012663343000256999999998099066-0520221---------------------------- Q gi|254781020|r 48 VEFLGKKLSFPLLISSMTGGNNKMIERINRNLAIAAEKTKVAMA-VGSQRVM---------------------------- 98 (337) Q Consensus 48 t~i~G~~l~~Pv~iapmsgg~~~~~~~~~~~lA~aa~~~g~~~~-~g~~~~~---------------------------- 98 (337) T Consensus 1 V~~~Gl~l~nPi~~aAG--~~~---~--~~~~~~~~~~~G~G~vv~ktit~~~~~gn~~Pr~~~~~~~~~~~~~~~~~~N 73 (289) T cd02810 1 VNFLGLKLKNPFGVAAG--PLL---K--TGELIARAAAAGFGAVVYKTVTLHPRPGNPLPRVARLPPEGESYPEQLGILN 73 (289) T ss_pred CEECCEECCCCCEECCC--CCC---C--CHHHHHHHHHCCCCEEEECCCCCCCCCCCCCCEEEEECCCCCCCCCCCCEEC T ss_conf 96699828998888977--888---9--9899999997698789927357220158987518870366656755103621 Q ss_pred ---HCCHHHHHHHHHH----HHCCCHHHHHCCCCCCCCCCCCHHHHHHHHHHHCCCEEEECCCCHHHHHHHCCCCCHHHH Q ss_conf ---1286688899999----866401232202752123679989999877650898576253203566520688524307 Q gi|254781020|r 99 ---FSDHNAIKSFELR----QYAPHTVLISNLGAVQLNYDFGVQKAHQAVHVLGADGLFLHLNPLQEIIQPNGNTNFADL 171 (337) Q Consensus 99 ---~~~~~~~~~~~~~----~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 171 (337) T Consensus 74 ~~g~~n~g~~~~~~~l~~~~~~~~~~pli~Si~~~~---~~~~~~~a~~~~~~gad~lElNiScPn~~~~~~~~~~~~~~ 150 (289) T cd02810 74 SFGLPNLGLDVWLQDIAKAKKEFPGQPLIASVGGSS---KEDYVELARKIERAGAKALELNLSCPNVGGGRQLGQDPEAV 150 (289) T ss_pred CCCCCCCCHHHHHHHHHHHHHCCCCCEEEEECCCCC---HHHHHHHHHHHHHHCCCEEEEEEECCCCCCCCCCCCCHHHH T ss_conf 554678788999999999986179953999788898---78999999999984798489984036756553201499999 Q ss_pred HHHHHHHHHHCCCCEEEEECCCCCC---HHHHHHHHHCCCCEEEECCCCCCCCCCHHHHCCCCCCCCHHHHHCCCCHHHH Q ss_conf 9999999987399717850478668---8999999976997999458888651001231023443232443106346889 Q gi|254781020|r 172 SSKIALLSSAMDVPLLLKEVGCGLS---SMDIELGLKSGIRYFDIAGRGGTSWSRIESHRDLESDIGIVFQDWGIPTPLS 248 (337) Q Consensus 172 ~~~i~~l~~~~~~pii~k~v~~~~~---~~~~~~a~~aGad~i~v~~~gG~~~~~~~~~r~~~~~~~~~~~~~gi~~~~a 248 (337) T Consensus 151 ~~i~~~v~~~~~~Pv~vKLsp~~~~~~~~~ia~~~~~~ga~gv~~~Nt~~~~~~~~~~~~~~~~~~~gGlSG~~i~~~-a 229 (289) T cd02810 151 ANLLKAVKAAVDIPLLVKLSPYFDLEDIVELAKAAERAGADGLTAINTISGRVVDLKTVGPGPKRGTGGLSGAPIRPL-A 229 (289) T ss_pred HHHHHHHHHCCCCCEEEECCCCCCHHHHHHHHHHHHHCCCCEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHH-H T ss_conf 999999986026874884278876168999999999759968999678776555444455445677652366277889-9 Q ss_pred HHH---HHHH-CCCCEEEECCCCCCHHHHHHHHHHCCCEEHHHHHHHHHHCCCHHHHH Q ss_conf 999---9852-28987997298888899999998388852334799998414668999 Q gi|254781020|r 249 LEM---ARPY-CNEAQFIASGGLRNGVDILKSIILGASLGGLASPFLKPAMDSSDAVV 302 (337) Q Consensus 249 l~~---~~~~-~~~v~IiadGGIr~g~Dv~kAlalGAdaV~iGr~~l~~~~~G~~gv~ 302 (337) T Consensus 230 l~~v~~~~~~~~~~i~Iig~GGI~~~~da~e~i~aGA~~Vqv~Tal~~---~Gp~ii~ 284 (289) T cd02810 230 LRWVARLAARLQLDIPIIGVGGIDSGEDVLEMLMAGASAVQVATALMW---DGPDVIR 284 (289) T ss_pred HHHHHHHHHHCCCCCEEEEECCCCCHHHHHHHHHCCCCHHHHHHHHHH---HCHHHHH T ss_conf 999999999749996099989939999999999849979999899997---5869999

HHsearch alignment for GI: 254781020 and conserved domain: cd02810