Q8XZ83 · CARB_RALN1

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.

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 site129ATP 1 (UniProtKB | ChEBI)
Binding site176ATP 1 (UniProtKB | ChEBI)
Binding site182ATP 1 (UniProtKB | ChEBI)
Binding site183ATP 1 (UniProtKB | ChEBI)
Binding site215ATP 1 (UniProtKB | ChEBI)
Binding site217ATP 1 (UniProtKB | ChEBI)
Binding site222ATP 1 (UniProtKB | ChEBI)
Binding site248ATP 1 (UniProtKB | ChEBI)
Binding site249ATP 1 (UniProtKB | ChEBI)
Binding site250ATP 1 (UniProtKB | ChEBI)
Binding site292ATP 1 (UniProtKB | ChEBI)
Binding site292Mg2+ 1 (UniProtKB | ChEBI)
Binding site292Mn2+ 1 (UniProtKB | ChEBI)
Binding site306ATP 1 (UniProtKB | ChEBI)
Binding site306Mg2+ 1 (UniProtKB | ChEBI)
Binding site306Mg2+ 2 (UniProtKB | ChEBI)
Binding site306Mn2+ 1 (UniProtKB | ChEBI)
Binding site306Mn2+ 2 (UniProtKB | ChEBI)
Binding site308Mg2+ 2 (UniProtKB | ChEBI)
Binding site308Mn2+ 2 (UniProtKB | ChEBI)
Binding site719ATP 2 (UniProtKB | ChEBI)
Binding site758ATP 2 (UniProtKB | ChEBI)
Binding site760ATP 2 (UniProtKB | ChEBI)
Binding site765ATP 2 (UniProtKB | ChEBI)
Binding site790ATP 2 (UniProtKB | ChEBI)
Binding site791ATP 2 (UniProtKB | ChEBI)
Binding site792ATP 2 (UniProtKB | ChEBI)
Binding site793ATP 2 (UniProtKB | ChEBI)
Binding site833ATP 2 (UniProtKB | ChEBI)
Binding site833Mg2+ 3 (UniProtKB | ChEBI)
Binding site833Mn2+ 3 (UniProtKB | ChEBI)
Binding site849ATP 2 (UniProtKB | ChEBI)
Binding site849Mg2+ 3 (UniProtKB | ChEBI)
Binding site849Mg2+ 4 (UniProtKB | ChEBI)
Binding site849Mn2+ 3 (UniProtKB | ChEBI)
Binding site849Mn2+ 4 (UniProtKB | ChEBI)
Binding site851Mg2+ 4 (UniProtKB | ChEBI)
Binding site851Mn2+ 4 (UniProtKB | ChEBI)

GO annotations

AspectTerm
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

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
    • ORF names
      RS03783
    • Ordered locus names
      RSc1521

Organism names

Accessions

  • Primary accession
    Q8XZ83

Proteomes

PTM/Processing

Features

Showing features for chain.

TypeIDPosition(s)Description
ChainPRO_00001450311-1081Carbamoyl phosphate synthase large chain

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.

Protein-protein interaction databases

Structure

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-410Carboxyphosphate synthetic domain
Domain133-335ATP-grasp 1
Region411-558Oligomerization domain
Region559-944Carbamoyl phosphate synthetic domain
Domain683-878ATP-grasp 2
Domain945-1081MGS-like
Region945-1081Allosteric 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
    1,081
  • Mass (Da)
    117,896
  • Last updated
    2002-03-01 v1
  • Checksum
    F6BF743D810AAF68
MPKRTDIKTILIIGAGPIIIGQACEFDYSGAQACKALREEGFKVVLVNSNPATIMTDPSTADVTYIEPITWEVVERIIAKERPDAILPTMGGQTALNCALDLHRHGVLEKYNVELIGASPEAIDKAEDRQKFKEAMTKIGLGSAKSGIAHSLEEALAVQAQIARETSSGGYPIVIRPSFTLGGTGGGIAYNREEFEDICKRGLDLSPTNELLIEESLLGWKEYEMEVVRDKKDNCIIVCSIENLDPMGIHTGDSITVAPAQTLTDKEYQILRNASLAVLREIGVDTGGSNVQFSINPEDGRMIVIEMNPRVSRSSALASKATGFPIAKVAAKLAVGYTLDELKNEITGGATPASFEPSIDYVVTKVPRFAFEKFPQADSHLTTQMKSVGEVMAMGRTFQESFQKALRGLEVGVDGLDEKSSDRDEIIAEIGEPGPDRIWYLGDAFRLGLSIDEVYAETAVDPWFLAQIEDIVRTEALVKARTLDSLSAAELRLLKQKGFSDRRLATLMKTTAQAVREKRIAEKVRPVYKRVDTCAAEFATNTAYLYSTYEAEHGECEADPTERKKIMVLGGGPNRIGQGIEFDYCCVHAALALREDGYETIMVNCNPETVSTDYDTSDRLYFEPVTLEDVLEIVDKEKPVGVIVQYGGQTPLKLALDLEANGVPIIGTTPDMIDAAEDRERFQKLLHDLGLRQPPNRTARAEDEALKLADEIGYPLVVRPSYVLGGRAMEIVHEPRDLERYMREAVKVSNDSPVLLDRFLNDAIECDVDCLSDGKRVFIGGVMEHIEQAGVHSGDSACSLPPYSLSQATVDELKRQTAAMARALNVIGLMNVQFAIQQKGGEDIVYVLEVNPRASRTVPYVSKATGISLAKVAARCMAGQSLDEQGIHDEVVPSYYSVKEAVFPFNKFPGVDPVLGPEMRSTGEVMGVGRTFGEALFKSQLAAGSRLPEKGTVLMTVKDSDKPRAIEVARTLHTLGYPIVATRGTASAIEAAGIPVRVVNKVKDGRPHIVDMIKNGELALVFTTVDETRAAIADSRSIRTAALANRVTYYTTIAGARAAVEGLKHLQNLDVYDLQGLHASL

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AL646052
EMBL· GenBank· DDBJ
CAD15223.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

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