E3HCJ5 · E3HCJ5_ILYPC

Function

function

Large subunit of the glutamine-dependent carbamoyl phosphate synthetase (CPSase). CPSase catalyzes the formation of carbamoyl phosphate from the ammonia moiety of glutamine, carbonate, and phosphate donated by ATP, constituting the first step of 2 biosynthetic pathways, one leading to arginine and/or urea and the other to pyrimidine nucleotides. The large subunit (synthetase) binds the substrates ammonia (free or transferred from glutamine from the small subunit), hydrogencarbonate and ATP and carries out an ATP-coupled ligase reaction, activating hydrogencarbonate by forming carboxy phosphate which reacts with ammonia to form carbamoyl phosphate.

Caution

Lacks conserved residue(s) required for the propagation of feature annotation.

Catalytic activity

Cofactor

Mg2+ (UniProtKB | Rhea| CHEBI:18420 )

Mn2+ (UniProtKB | Rhea| CHEBI:29035 )

Note: Binds 4 Mg2+ or Mn2+ ions per subunit.

Pathway

Amino-acid biosynthesis; L-arginine biosynthesis; carbamoyl phosphate from bicarbonate: step 1/1.
Pyrimidine metabolism; UMP biosynthesis via de novo pathway; (S)-dihydroorotate from bicarbonate: step 1/3.

Features

Showing features for binding site.

TypeIDPosition(s)Description
Binding site128ATP 1 (UniProtKB | ChEBI)
Binding site168ATP 1 (UniProtKB | ChEBI)
Binding site174ATP 1 (UniProtKB | ChEBI)
Binding site175ATP 1 (UniProtKB | ChEBI)
Binding site207ATP 1 (UniProtKB | ChEBI)
Binding site209ATP 1 (UniProtKB | ChEBI)
Binding site214ATP 1 (UniProtKB | ChEBI)
Binding site240ATP 1 (UniProtKB | ChEBI)
Binding site241ATP 1 (UniProtKB | ChEBI)
Binding site242ATP 1 (UniProtKB | ChEBI)
Binding site283ATP 1 (UniProtKB | ChEBI)
Binding site283Mg2+ 1 (UniProtKB | ChEBI)
Binding site283Mn2+ 1 (UniProtKB | ChEBI)
Binding site297ATP 1 (UniProtKB | ChEBI)
Binding site297Mg2+ 1 (UniProtKB | ChEBI)
Binding site297Mg2+ 2 (UniProtKB | ChEBI)
Binding site297Mn2+ 2 (UniProtKB | ChEBI)
Binding site297Mn2+ 1 (UniProtKB | ChEBI)
Binding site299Mg2+ 2 (UniProtKB | ChEBI)
Binding site299Mn2+ 2 (UniProtKB | ChEBI)
Binding site709ATP 2 (UniProtKB | ChEBI)
Binding site748ATP 2 (UniProtKB | ChEBI)
Binding site750ATP 2 (UniProtKB | ChEBI)
Binding site754ATP 2 (UniProtKB | ChEBI)
Binding site779ATP 2 (UniProtKB | ChEBI)
Binding site780ATP 2 (UniProtKB | ChEBI)
Binding site781ATP 2 (UniProtKB | ChEBI)
Binding site782ATP 2 (UniProtKB | ChEBI)
Binding site822ATP 2 (UniProtKB | ChEBI)
Binding site822Mg2+ 3 (UniProtKB | ChEBI)
Binding site822Mn2+ 3 (UniProtKB | ChEBI)
Binding site834ATP 2 (UniProtKB | ChEBI)
Binding site834Mg2+ 3 (UniProtKB | ChEBI)
Binding site834Mg2+ 4 (UniProtKB | ChEBI)
Binding site834Mn2+ 4 (UniProtKB | ChEBI)
Binding site834Mn2+ 3 (UniProtKB | ChEBI)
Binding site836Mg2+ 4 (UniProtKB | ChEBI)
Binding site836Mn2+ 4 (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentcytoplasm
Molecular FunctionATP binding
Molecular Functioncarbamoyl-phosphate synthase (ammonia) activity
Molecular Functioncarbamoyl-phosphate synthase (glutamine-hydrolyzing) activity
Molecular Functionmetal ion binding
Biological Process'de novo' UMP biosynthetic process
Biological Processarginine biosynthetic process
Biological Processglutamine metabolic process

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Carbamoyl phosphate synthase large chain
  • EC number
  • Alternative names
    • Carbamoyl phosphate synthetase ammonia chain

Gene names

    • Name
      carB
    • Ordered locus names
      Ilyop_2208

Encoded on

  • Plasmid pILYOP01

Organism names

Accessions

  • Primary accession
    E3HCJ5

Proteomes

Subcellular Location

Interaction

Subunit

Composed of two chains; the small (or glutamine) chain promotes the hydrolysis of glutamine to ammonia, which is used by the large (or ammonia) chain to synthesize carbamoyl phosphate. Tetramer of heterodimers (alpha,beta)4.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-400Carboxyphosphate synthetic domain
Domain132-326ATP-grasp
Region549-931Carbamoyl phosphate synthetic domain
Domain673-863ATP-grasp
Domain931-1069MGS-like
Region932-1069Allosteric domain

Domain

The large subunit is composed of 2 ATP-grasp domains that are involved in binding the 2 ATP molecules needed for carbamoyl phosphate synthesis. The N-terminal ATP-grasp domain (referred to as the carboxyphosphate synthetic component) catalyzes the ATP-dependent phosphorylation of hydrogencarbonate to carboxyphosphate and the subsequent nucleophilic attack by ammonia to form a carbamate intermediate. The C-terminal ATP-grasp domain (referred to as the carbamoyl phosphate synthetic component) then catalyzes the phosphorylation of carbamate with the second ATP to form the end product carbamoyl phosphate. The reactive and unstable enzyme intermediates are sequentially channeled from one active site to the next through the interior of the protein over a distance of at least 96 A.

Sequence similarities

Belongs to the CarB family.

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    1,069
  • Mass (Da)
    118,950
  • Last updated
    2011-01-11 v1
  • Checksum
    2CEEF862618BD4BD
MLDKSIKKTLVIGSGPIVIGQAAEFDYSGTQACEALKQEGIEVVLINSNPATIMTDRAVADRIYIEPITIEFVEKVIKKERPDSILAGMGGQTALNIAVELYDSGILDKYNVKVIGTPIDSIKRGEDRDLFRDAMKKIGEPTIESKIVENLKDGLEFAAQIGYPLVVRPAYTLGGSGGGIANDPQELEDILLKGLKLSRVGQVLVEKSILGWKEVEYEVIRDENGNCITVCNMENIDPVGIHTGDSIVVAPSQTLSDKEYQMLRTSSIKIINEIGVIGGCNVQFALHPKSFKYAIIEINPRVSRSSALASKATGYPIARVATKLSLGYTLDEVKNEVTGQTYACFEPALDYCVVKIPKWPFDKFKKADRKLGTKMMATGEIMAIGNNFEAAFLKGIRSLEIGQYNMEHPVAKKMSIRELKNAVMRPDDERIFVAAEMLRRGYVKSKLQKITGMDKFFMEKIEWIVKQEELLKRSTLKDMDKHTLRNLKKKGFSDKGIAALMNVSEADIVAKRKELDIRPVYKMVDTCAAEFDAVSSYYYSTYDIYDEVTVSDKRKILVVGSGPIRIGQGIEFDYCTVHSIKALQKMGIETIIINNNPETVSTDFSTADKLYFEPLITEDVMNIIEKEQPEGVVLQFGGQTAIKLANDLAAAGVKIIGTSADKIDEAEDRERFEAMMEKLDIKRPKGRAVWKIEPGIEIANSVGYPVLVRPSYVLGGQGMEICHDEYNLVKYLEASFDRDPENPVLIDKYLNGIEIEIDAICDGEDVLIPGIMEHLERAGVHSGDSITVYPSKNLYEGTEVKILDYAKKIAKELEISGMMNIQFIAFENEIYVIEVNPRSSRTVPYISKVTGVPMIELATKVMLGEKLADMEYGTGIYKKPNVYAVKVPVFSTEKLGNVEVSLGPEMKSTGEVLGVSESLDEAIYKGLVGGYRLSQIKNKNVLVTIRDKDKEEFLPLAKRLIGQGCKLFSTVGTQKFLETHGITAEKVNKISEENPNILDKLKNREIDLLINTATKANDAMRDGFRIRRTAIEYGVEVLTSLDTLNAILNIMEKNIHLNKELKVYDISQI

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
CP002282
EMBL· GenBank· DDBJ
ADO83971.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

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