ID PYRB_STRGC Reviewed; 306 AA. AC A8AX88; DT 20-MAY-2008, integrated into UniProtKB/Swiss-Prot. DT 23-OCT-2007, sequence version 1. DT 18-JUN-2025, entry version 98. 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=SGO_1109; OS Streptococcus gordonii (strain Challis / ATCC 35105 / BCRC 15272 / CH1 / OS DL1 / V288). OC Bacteria; Bacillati; Bacillota; Bacilli; Lactobacillales; Streptococcaceae; OC Streptococcus. OX NCBI_TaxID=467705; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=Challis / ATCC 35105 / BCRC 15272 / CH1 / DL1 / V288; RX PubMed=17720781; DOI=10.1128/jb.01023-07; RA Vickerman M.M., Iobst S., Jesionowski A.M., Gill S.R.; RT "Genome-wide transcriptional changes in Streptococcus gordonii in response RT to competence signaling peptide."; RL J. Bacteriol. 189:7799-7807(2007). 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}. 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; CP000725; ABV09520.1; -; Genomic_DNA. DR RefSeq; WP_012000520.1; NC_009785.1. DR AlphaFoldDB; A8AX88; -. DR SMR; A8AX88; -. DR STRING; 467705.SGO_1109; -. DR KEGG; sgo:SGO_1109; -. DR eggNOG; COG0540; Bacteria. DR HOGENOM; CLU_043846_2_1_9; -. DR UniPathway; UPA00070; UER00116. DR Proteomes; UP000001131; Chromosome. DR GO; GO:0005829; C:cytosol; IEA:TreeGrafter. 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..306 FT /note="Aspartate carbamoyltransferase catalytic subunit" FT /id="PRO_1000073744" 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 306 AA; 34741 MW; BC79CE287E1D1553 CRC64; MSSNQIALKN LVSMETLSNE EVMALIKRGI EFKNGAKANY DEQHIVANLF FEPSTRTHKA FEVAELKLGC DLLDFDVKTS SVNKGETLYD TILTMSALGV DICVIRHPEV DYYKELVESP TITTSIVNGG DGSGQHPSQS LLDLMTIYQE FGHFEGLKVA IAGDLDHSRV AKSNMQILKR LGAELYFAGP EEWRSEEFSH YGEFVTIDEV VDKVDVMMFL RVQHERHDYE SIFSKENYHR LHGLTQERYD RMKDTAILMH PAPVNRDVEI ADHLVEAPKS RIVEQMTNGV FVRMAIIEAV LKGREK //