ID   PYRDB_BACCL             Reviewed;         313 AA.
AC   P46539;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 105.
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;
OS   Bacillus caldolyticus.
OC   Bacteria; Firmicutes; Bacilli; Bacillales; Bacillaceae; Geobacillus;
OC   Geobacillus thermoleovorans group.
OX   NCBI_TaxID=1394;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=DSM 405 / NBRC 15313 / YP-T;
RX   PubMed=7516791; DOI=10.1099/00221287-140-3-479;
RA   Ghim S.Y., Nielsen P., Neuhard J.;
RT   "Molecular characterization of pyrimidine biosynthesis genes from the
RT   thermophile Bacillus caldolyticus.";
RL   Microbiology 140:479-491(1994).
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; X73308; CAA51741.1; -; Genomic_DNA.
DR   PIR; I40171; I40171.
DR   AlphaFoldDB; P46539; -.
DR   SMR; P46539; -.
DR   UniPathway; UPA00070; UER00945.
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.
DR   PROSITE; PS00912; DHODEHASE_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Flavoprotein; FMN; NAD; Oxidoreductase; Pyrimidine biosynthesis.
FT   CHAIN           1..313
FT                   /note="Dihydroorotate dehydrogenase B (NAD(+)), catalytic
FT                   subunit"
FT                   /id="PRO_0000148387"
FT   ACT_SITE        130
FT                   /note="Nucleophile"
FT   BINDING         21
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         45..46
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         45
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         69..73
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         99
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         127
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         127
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         191
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         192..193
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         217
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         243..244
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
FT   BINDING         265..266
FT                   /ligand="FMN"
FT                   /ligand_id="ChEBI:CHEBI:58210"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   313 AA;  32857 MW;  8EB76F840A49798E CRC64;
     MNRLAVELPG LSLKNPIMPA SGCFGFGREY ARFYDLSVLG AIMIKATTKE PRFGNPTPRV
     AETPGGMLNA IGLQNPGLDK VLEEELPWLE QFDVPIIANI AGSTVEEYVE VAEAISKAPN
     VHALELNISC PNVKKGGIAF GTVPDVAAEL TRLVKEVAAV PVYVNVSPNV TDIVAMAKAI
     EQAGADGLTM INTLVGMRID VKTGRPILAN GTGGLSGPAV KPIAIRMIYE VSQAVSIPII
     GMGGIQTAED VLEFFYAGAS AVAVGTANFV DPFVCPTIIA DLPALLDDLG IGHISECIGR
     SWKTGAHAVH CRA