ID   PYRDB_ENDTX             Reviewed;         306 AA.
AC   B1GYY3;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   29-APR-2008, sequence version 1.
DT   03-AUG-2022, entry version 77.
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=TGRD_743;
OS   Endomicrobium trichonymphae.
OC   Bacteria; Elusimicrobia; Endomicrobia; Endomicrobiales; Endomicrobiaceae;
OC   Endomicrobium.
OX   NCBI_TaxID=1408204;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RX   PubMed=18391199; DOI=10.1073/pnas.0801389105;
RA   Hongoh Y., Sharma V.K., Prakash T., Noda S., Taylor T.D., Kudo T.,
RA   Sakaki Y., Toyoda A., Hattori M., Ohkuma M.;
RT   "Complete genome of the uncultured termite group 1 bacteria in a single
RT   host protist cell.";
RL   Proc. Natl. Acad. Sci. U.S.A. 105:5555-5560(2008).
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}.
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DR   EMBL; AP009510; BAG14226.1; -; Genomic_DNA.
DR   RefSeq; WP_015423747.1; NC_020419.1.
DR   RefSeq; YP_001956687.1; NC_020419.1.
DR   AlphaFoldDB; B1GYY3; -.
DR   SMR; B1GYY3; -.
DR   STRING; 471821.TGRD_743; -.
DR   EnsemblBacteria; BAG14226; BAG14226; TGRD_743.
DR   KEGG; rsd:TGRD_743; -.
DR   HOGENOM; CLU_042042_4_3_0; -.
DR   OMA; SCPHAKG; -.
DR   OrthoDB; 1109542at2; -.
DR   UniPathway; UPA00070; UER00945.
DR   Proteomes; UP000001691; 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; PS00911; DHODEHASE_1; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Flavoprotein; FMN; NAD; Oxidoreductase; Pyrimidine biosynthesis.
FT   CHAIN           1..306
FT                   /note="Dihydroorotate dehydrogenase B (NAD(+)), catalytic
FT                   subunit"
FT                   /id="PRO_1000100239"
FT   ACT_SITE        131
FT                   /note="Nucleophile"
FT   BINDING         22
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         46..47
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         46
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         70..74
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         128
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         128
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         164
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         191..192
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         216
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         242..243
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         264..265
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   306 AA;  32168 MW;  2F35CD5796259218 CRC64;
     MIPDLSVNFA GIKLKNPVLT ASGTFGYGYE LADLIPLKRL GGVVTKTVTL EPRAGNLQPR
     IAEVASGILN SIGLQNIGVR AFIEEPLEKL NKIGVPVIVS VAGVAVGEYV EIVKILSSQN
     GVSAIELNLS CPNLKKKIVC HDLPLMRDVI RGVKKVSRVP VIAKLSPLVT DISELALTAQ
     NAGADGVTLT NTYPAMAVDI RTFKPKLSTV KGGMSGACIK PMSVRCVYDA YQDIKIPIIG
     CGGIMMGEDA VEFILAGATA VSVGSSSLVS PGNLIAIIDG IEDILKEKNI KSVKKIIGGI
     NKVRNA