ID PYRB_NEIMB Reviewed; 306 AA. AC P65616; Q9JQU5; DT 11-OCT-2004, integrated into UniProtKB/Swiss-Prot. DT 11-OCT-2004, sequence version 1. DT 28-JAN-2026, entry version 114. 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=NMB0106; OS Neisseria meningitidis serogroup B (strain ATCC BAA-335 / MC58). OC Bacteria; Pseudomonadati; Pseudomonadota; Betaproteobacteria; Neisseriales; OC Neisseriaceae; Neisseria. OX NCBI_TaxID=122586; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=ATCC BAA-335 / MC58; RX PubMed=10710307; DOI=10.1126/science.287.5459.1809; RA Tettelin H., Saunders N.J., Heidelberg J.F., Jeffries A.C., Nelson K.E., RA Eisen J.A., Ketchum K.A., Hood D.W., Peden J.F., Dodson R.J., Nelson W.C., RA Gwinn M.L., DeBoy R.T., Peterson J.D., Hickey E.K., Haft D.H., RA Salzberg S.L., White O., Fleischmann R.D., Dougherty B.A., Mason T.M., RA Ciecko A., Parksey D.S., Blair E., Cittone H., Clark E.B., Cotton M.D., RA Utterback T.R., Khouri H.M., Qin H., Vamathevan J.J., Gill J., Scarlato V., RA Masignani V., Pizza M., Grandi G., Sun L., Smith H.O., Fraser C.M., RA Moxon E.R., Rappuoli R., Venter J.C.; RT "Complete genome sequence of Neisseria meningitidis serogroup B strain RT MC58."; RL Science 287:1809-1815(2000). 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; AE002098; AAF40565.1; -; Genomic_DNA. DR PIR; A81238; A81238. DR RefSeq; WP_002215336.1; NC_003112.2. DR AlphaFoldDB; P65616; -. DR SMR; P65616; -. DR FunCoup; P65616; 522. DR STRING; 122586.NMB0106; -. DR PaxDb; 122586-NMB0106; -. DR GeneID; 93387178; -. DR KEGG; nme:NMB0106; -. DR PATRIC; fig|122586.8.peg.146; -. DR HOGENOM; CLU_043846_1_2_4; -. DR InParanoid; P65616; -. DR OrthoDB; 9774690at2; -. DR UniPathway; UPA00070; UER00116. DR Proteomes; UP000000425; 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:000001; Aspartate carbamoyltransferase; 1. DR FunFam; 3.40.50.1370:FF:000002; Aspartate carbamoyltransferase 2; 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_0000113165" FT BINDING 55 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 56 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 105 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 133 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 166 FT /ligand="L-aspartate" FT /ligand_id="ChEBI:CHEBI:29991" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 227 FT /ligand="L-aspartate" FT /ligand_id="ChEBI:CHEBI:29991" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 265 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 266 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" SQ SEQUENCE 306 AA; 34205 MW; C6865145E0B7F8C9 CRC64; MPNPLYRQHI ISISDLSREQ LECLLQTALK LKAHPRGDLL EGKLIGSCFF EPSTRTRLSF ETAVQRLGGK VIGFSDGANT SAKKGETLAD TARIISGYTD AIIQRHPKDG AARVAAEFSR VPVINAGDGT NQHPSQTLLD LVTIYETQGR LDKLKIAMAG DLKYGRTVHS LCQALKRWNC EFAFVSPPSL AMPDYITEEL DEAGCRYRIL GSLEEAAEWA DILYMTRVQR ERFDEQEFAK IQGKFNLEAS MLARAKPNLR VLHPLPRVDE IHPDVDATPH AYYFEQATNG VYARMAILSL VLNEEV //