ID   PYRB_STRR6              Reviewed;         307 AA.
AC   Q8DPH9;
DT   20-JUN-2003, integrated into UniProtKB/Swiss-Prot.
DT   01-MAR-2003, sequence version 1.
DT   10-JUN-2026, entry version 119.
DE   RecName: Full=Aspartate carbamoyltransferase catalytic subunit {ECO:0000255|HAMAP-Rule:MF_00001};
DE            EC=2.1.3.2 {ECO:0000255|HAMAP-Rule:MF_00001};
DE   AltName: Full=Aspartate transcarbamylase {ECO:0000255|HAMAP-Rule:MF_00001};
DE            Short=ATCase {ECO:0000255|HAMAP-Rule:MF_00001};
GN   Name=pyrB {ECO:0000255|HAMAP-Rule:MF_00001};
GN   OrderedLocusNames=spr1155;
OS   Streptococcus pneumoniae (strain ATCC BAA-255 / R6).
OC   Bacteria; Bacillati; Bacillota; Bacilli; Lactobacillales; Streptococcaceae;
OC   Streptococcus.
OX   NCBI_TaxID=171101;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-255 / R6;
RX   PubMed=11544234; DOI=10.1128/jb.183.19.5709-5717.2001;
RA   Hoskins J., Alborn W.E. Jr., Arnold J., Blaszczak L.C., Burgett S.,
RA   DeHoff B.S., Estrem S.T., Fritz L., Fu D.-J., Fuller W., Geringer C.,
RA   Gilmour R., Glass J.S., Khoja H., Kraft A.R., Lagace R.E., LeBlanc D.J.,
RA   Lee L.N., Lefkowitz E.J., Lu J., Matsushima P., McAhren S.M., McHenney M.,
RA   McLeaster K., Mundy C.W., Nicas T.I., Norris F.H., O'Gara M., Peery R.B.,
RA   Robertson G.T., Rockey P., Sun P.-M., Winkler M.E., Yang Y.,
RA   Young-Bellido M., Zhao G., Zook C.A., Baltz R.H., Jaskunas S.R.,
RA   Rosteck P.R. Jr., Skatrud P.L., Glass J.I.;
RT   "Genome of the bacterium Streptococcus pneumoniae strain R6.";
RL   J. Bacteriol. 183:5709-5717(2001).
CC   -!- FUNCTION: Catalyzes the condensation of carbamoyl phosphate and
CC       aspartate to form carbamoyl aspartate and inorganic phosphate, the
CC       committed step in the de novo pyrimidine nucleotide biosynthesis
CC       pathway. {ECO:0000255|HAMAP-Rule:MF_00001}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=carbamoyl phosphate + L-aspartate = N-carbamoyl-L-aspartate +
CC         phosphate + H(+); Xref=Rhea:RHEA:20013, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:29991, ChEBI:CHEBI:32814, ChEBI:CHEBI:43474,
CC         ChEBI:CHEBI:58228; EC=2.1.3.2; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00001};
CC   -!- PATHWAY: Pyrimidine metabolism; UMP biosynthesis via de novo pathway;
CC       (S)-dihydroorotate from bicarbonate: step 2/3. {ECO:0000255|HAMAP-
CC       Rule:MF_00001}.
CC   -!- SUBUNIT: Heterododecamer (2C3:3R2) of six catalytic PyrB chains
CC       organized as two trimers (C3), and six regulatory PyrI chains organized
CC       as three dimers (R2). {ECO:0000255|HAMAP-Rule:MF_00001}.
CC   -!- SIMILARITY: Belongs to the aspartate/ornithine carbamoyltransferase
CC       superfamily. ATCase family. {ECO:0000255|HAMAP-Rule:MF_00001}.
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DR   EMBL; AE007317; AAK99958.1; -; Genomic_DNA.
DR   PIR; B98016; B98016.
DR   RefSeq; WP_001293822.1; NC_003098.1.
DR   AlphaFoldDB; Q8DPH9; -.
DR   SMR; Q8DPH9; -.
DR   STRING; 171101.spr1155; -.
DR   PaxDb; 171101-spr1155; -.
DR   KEGG; spr:spr1155; -.
DR   PATRIC; fig|171101.6.peg.1253; -.
DR   eggNOG; COG0540; Bacteria.
DR   HOGENOM; CLU_043846_2_1_9; -.
DR   UniPathway; UPA00070; UER00116.
DR   Proteomes; UP000000586; Chromosome.
DR   GO; GO:0016597; F:amino acid binding; IEA:InterPro.
DR   GO; GO:0004070; F:aspartate carbamoyltransferase activity; IEA:UniProtKB-UniRule.
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-UniRule.
DR   GO; GO:0006520; P:amino acid metabolic process; IEA:InterPro.
DR   FunFam; 3.40.50.1370:FF:000011; Aspartate carbamoyltransferase; 1.
DR   Gene3D; 3.40.50.1370; Aspartate/ornithine carbamoyltransferase; 2.
DR   HAMAP; MF_00001; Asp_carb_tr; 1.
DR   InterPro; IPR006132; Asp/Orn_carbamoyltranf_P-bd.
DR   InterPro; IPR006130; Asp/Orn_carbamoylTrfase.
DR   InterPro; IPR036901; Asp/Orn_carbamoylTrfase_sf.
DR   InterPro; IPR002082; Asp_carbamoyltransf.
DR   InterPro; IPR006131; Asp_carbamoyltransf_Asp/Orn-bd.
DR   NCBIfam; TIGR00670; asp_carb_tr; 1.
DR   NCBIfam; NF002032; PRK00856.1; 1.
DR   PANTHER; PTHR45753:SF6; ASPARTATE CARBAMOYLTRANSFERASE; 1.
DR   PANTHER; PTHR45753; ORNITHINE CARBAMOYLTRANSFERASE, MITOCHONDRIAL; 1.
DR   Pfam; PF00185; OTCace; 1.
DR   Pfam; PF02729; OTCace_N; 1.
DR   PRINTS; PR00100; AOTCASE.
DR   PRINTS; PR00101; ATCASE.
DR   SUPFAM; SSF53671; Aspartate/ornithine carbamoyltransferase; 1.
DR   PROSITE; PS00097; CARBAMOYLTRANSFERASE; 1.
PE   3: Inferred from homology;
KW   Pyrimidine biosynthesis; Reference proteome; Transferase.
FT   CHAIN           1..307
FT                   /note="Aspartate carbamoyltransferase catalytic subunit"
FT                   /id="PRO_0000113207"
FT   BINDING         56
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         57
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         84
FT                   /ligand="L-aspartate"
FT                   /ligand_id="ChEBI:CHEBI:29991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         106
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         136
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         139
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         169
FT                   /ligand="L-aspartate"
FT                   /ligand_id="ChEBI:CHEBI:29991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         221
FT                   /ligand="L-aspartate"
FT                   /ligand_id="ChEBI:CHEBI:29991"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         262
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
FT   BINDING         263
FT                   /ligand="carbamoyl phosphate"
FT                   /ligand_id="ChEBI:CHEBI:58228"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00001"
SQ   SEQUENCE   307 AA;  34706 MW;  34208B4A16839663 CRC64;
     MSENQQALNH VVSMEDLTVD QVMKLIKRGI EFKNGAQIPY EDHPIVSNLF FEDSTRTHKS
     FEVAEIKLGL ERLDFDVKTS SVNKGETLYD TILTLSALGV DVCVIRHPEV DYYRELIASP
     TITTSIINGG DGSGQHPSQS LLDLMTIYEE FGHFEGLKVA IAGDLDHSRV AKSNMQILKR
     LGSELFFAGP EEWRSQEFAD YGKFVTIDEI IDQVDVMMFL RVQHERHDSG AVFSKEDYHA
     QHGLTQERYD RLKETAILMH PAPINRDVEI ADHLVEAPKS RIVQQMTNGV FVRMAILESV
     LASRNAN
//