ID PYRB_ACAM1 Reviewed; 323 AA. AC B0CED7; DT 20-MAY-2008, integrated into UniProtKB/Swiss-Prot. DT 26-FEB-2008, sequence version 1. DT 18-JUN-2025, entry version 85. 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=AM1_1883; OS Acaryochloris marina (strain MBIC 11017). OC Bacteria; Bacillati; Cyanobacteriota; Cyanophyceae; Acaryochloridales; OC Acaryochloridaceae; Acaryochloris. OX NCBI_TaxID=329726; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=MBIC 11017; RX PubMed=18252824; DOI=10.1073/pnas.0709772105; RA Swingley W.D., Chen M., Cheung P.C., Conrad A.L., Dejesa L.C., Hao J., RA Honchak B.M., Karbach L.E., Kurdoglu A., Lahiri S., Mastrian S.D., RA Miyashita H., Page L., Ramakrishna P., Satoh S., Sattley W.M., Shimada Y., RA Taylor H.L., Tomo T., Tsuchiya T., Wang Z.T., Raymond J., Mimuro M., RA Blankenship R.E., Touchman J.W.; RT "Niche adaptation and genome expansion in the chlorophyll d-producing RT cyanobacterium Acaryochloris marina."; RL Proc. Natl. Acad. Sci. U.S.A. 105:2005-2010(2008). 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; CP000828; ABW26903.1; -; Genomic_DNA. DR RefSeq; WP_012162405.1; NC_009925.1. DR AlphaFoldDB; B0CED7; -. DR SMR; B0CED7; -. DR STRING; 329726.AM1_1883; -. DR KEGG; amr:AM1_1883; -. DR eggNOG; COG0540; Bacteria. DR HOGENOM; CLU_043846_2_0_3; -. DR OrthoDB; 9774690at2; -. DR UniPathway; UPA00070; UER00116. DR Proteomes; UP000000268; 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:000007; 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..323 FT /note="Aspartate carbamoyltransferase catalytic subunit" FT /id="PRO_1000073718" FT BINDING 61 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 62 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 89 FT /ligand="L-aspartate" FT /ligand_id="ChEBI:CHEBI:29991" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 111 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 144 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 147 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 184 FT /ligand="L-aspartate" FT /ligand_id="ChEBI:CHEBI:29991" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 238 FT /ligand="L-aspartate" FT /ligand_id="ChEBI:CHEBI:29991" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 279 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" FT BINDING 280 FT /ligand="carbamoyl phosphate" FT /ligand_id="ChEBI:CHEBI:58228" FT /evidence="ECO:0000255|HAMAP-Rule:MF_00001" SQ SEQUENCE 323 AA; 35789 MW; A4B044037EB78DBC CRC64; MAETTWNRHH VLSLADFSAD ELNIVLQTAN SFKDVLYRKT KKVPTLQARL VTNLFFEPST RTRSSFELAA KRLSADVLNF SPGTSSLSKG ETILDTAKTF LAMGADMMVI RHQHSGVPQM IAQAMDDLGE QVGVLNAGDG FHEHPSQGLL DLFTLCTTLD PDQPTTHLLT GKKIAIVGDI LHSRVARSNL SSLVTCGADV HLAGPPTLLP KEFADYGAQV HWSLEPALEQ ADFVMTLRLQ HERMSQHLIP SIREYHQQFG ITRDRIQRCQ PQVKVLHPGP VNRGVEISSD LMDDESLSLI PHQVTSGIAV RMALLYLISN RSR //