ID   PYRDB_METAR             Reviewed;         301 AA.
AC   Q0W8E1;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   05-SEP-2006, sequence version 1.
DT   03-AUG-2022, entry version 92.
DE   RecName: Full=Dihydroorotate dehydrogenase B (NAD(+)), catalytic subunit;
DE            Short=DHOD B;
DE            Short=DHODase B;
DE            Short=DHOdehase B;
DE            EC=1.3.1.14;
DE   AltName: Full=Dihydroorotate oxidase B;
DE   AltName: Full=Orotate reductase (NADH);
GN   Name=pyrD; OrderedLocusNames=UNCMA_28250; ORFNames=LRC390;
OS   Methanocella arvoryzae (strain DSM 22066 / NBRC 105507 / MRE50).
OC   Archaea; Euryarchaeota; Stenosarchaea group; Methanomicrobia;
OC   Methanocellales; Methanocellaceae; Methanocella.
OX   NCBI_TaxID=351160;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 22066 / NBRC 105507 / MRE50;
RX   PubMed=16857943; DOI=10.1126/science.1127062;
RA   Erkel C., Kube M., Reinhardt R., Liesack W.;
RT   "Genome of rice cluster I archaea -- the key methane producers in the rice
RT   rhizosphere.";
RL   Science 313:370-372(2006).
CC   -!- FUNCTION: Catalyzes the conversion of dihydroorotate to orotate with
CC       NAD(+) as electron acceptor. {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(S)-dihydroorotate + NAD(+) = H(+) + NADH + orotate;
CC         Xref=Rhea:RHEA:13513, ChEBI:CHEBI:15378, ChEBI:CHEBI:30839,
CC         ChEBI:CHEBI:30864, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945; EC=1.3.1.14;
CC   -!- COFACTOR:
CC       Name=FMN; Xref=ChEBI:CHEBI:58210; Evidence={ECO:0000250};
CC       Note=Binds 1 FMN per subunit. {ECO:0000250};
CC   -!- PATHWAY: Pyrimidine metabolism; UMP biosynthesis via de novo pathway;
CC       orotate from (S)-dihydroorotate (NAD(+) route): step 1/1.
CC   -!- SUBUNIT: Heterotetramer of 2 PyrK and 2 PyrD type B subunits.
CC       {ECO:0000250}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the dihydroorotate dehydrogenase family. Type 1
CC       subfamily. {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; AM114193; CAJ35352.1; -; Genomic_DNA.
DR   RefSeq; WP_012037140.1; NC_009464.1.
DR   AlphaFoldDB; Q0W8E1; -.
DR   SMR; Q0W8E1; -.
DR   STRING; 351160.LRC390; -.
DR   EnsemblBacteria; CAJ35352; CAJ35352; LRC390.
DR   GeneID; 5143788; -.
DR   KEGG; rci:LRC390; -.
DR   PATRIC; fig|351160.9.peg.2895; -.
DR   eggNOG; arCOG00603; Archaea.
DR   OMA; SCPHAKG; -.
DR   OrthoDB; 31316at2157; -.
DR   UniPathway; UPA00070; UER00945.
DR   Proteomes; UP000000663; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004152; F:dihydroorotate dehydrogenase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0004589; F:orotate reductase (NADH) activity; IEA:UniProtKB-EC.
DR   GO; GO:0006207; P:'de novo' pyrimidine nucleobase biosynthetic process; IEA:InterPro.
DR   GO; GO:0044205; P:'de novo' UMP biosynthetic process; IEA:UniProtKB-UniPathway.
DR   CDD; cd04740; DHOD_1B_like; 1.
DR   Gene3D; 3.20.20.70; -; 1.
DR   HAMAP; MF_00224; DHO_dh_type1; 1.
DR   InterPro; IPR013785; Aldolase_TIM.
DR   InterPro; IPR033888; DHOD_1B.
DR   InterPro; IPR005720; Dihydroorotate_DH.
DR   InterPro; IPR024920; Dihydroorotate_DH_1.
DR   InterPro; IPR012135; Dihydroorotate_DH_1_2.
DR   InterPro; IPR001295; Dihydroorotate_DH_CS.
DR   Pfam; PF01180; DHO_dh; 1.
DR   PIRSF; PIRSF000164; DHO_oxidase; 1.
DR   TIGRFAMs; TIGR01037; pyrD_sub1_fam; 1.
DR   PROSITE; PS00912; DHODEHASE_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Flavoprotein; FMN; NAD; Oxidoreductase; Pyrimidine biosynthesis;
KW   Reference proteome.
FT   CHAIN           1..301
FT                   /note="Dihydroorotate dehydrogenase B (NAD(+)), catalytic
FT                   subunit"
FT                   /id="PRO_1000100238"
FT   ACT_SITE        125
FT                   /note="Nucleophile"
FT   BINDING         44..45
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         44
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         68..72
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         122
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         122
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         160
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         186
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         187..188
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         212
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         238..239
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         260..261
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   301 AA;  31301 MW;  D718BECDC528CD80 CRC64;
     MKITCNAGGL TLKNPTILAA GVLGTTGASL KRIASMGAGA VVTKSIGTEP KPGHHNPSMI
     RLEEGYINAM GLPNPSFGEF RQELEIARES GVPVIASIFG ATPEEFTAVA NGLPGADAYE
     LNVSCPHAKG YGMQCGTDPE LVRSITKAVK AAVKVPVWVK LTPNVTDIRP IGLAAQEGGA
     DAVVAINTLK AMAIDINTGW PILGNRSGGL SGPAVKPVAI KCVYDLYEVL DIPVIGVGGV
     SNWADAIEFM MAGACAVEIG SAVYEDIGTF ASVSMGISNY LDRKNMKLDE IIGLAHRVVK
     Q