A0A8J6RE68 · A0A8J6RE68_9CYAN

Function

function

Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen. Regulates intracellular CTP levels through interactions with the four ribonucleotide triphosphates.

Miscellaneous

CTPSs have evolved a hybrid strategy for distinguishing between UTP and CTP. The overlapping regions of the product feedback inhibitory and substrate sites recognize a common feature in both compounds, the triphosphate moiety. To differentiate isosteric substrate and product pyrimidine rings, an additional pocket far from the expected kinase/ligase catalytic site, specifically recognizes the cytosine and ribose portions of the product inhibitor.

Caution

Lacks conserved residue(s) required for the propagation of feature annotation.
The sequence shown here is derived from an EMBL/GenBank/DDBJ whole genome shotgun (WGS) entry which is preliminary data.

Catalytic activity

Activity regulation

Allosterically activated by GTP, when glutamine is the substrate; GTP has no effect on the reaction when ammonia is the substrate. The allosteric effector GTP functions by stabilizing the protein conformation that binds the tetrahedral intermediate(s) formed during glutamine hydrolysis. Inhibited by the product CTP, via allosteric rather than competitive inhibition.

Pathway

Pyrimidine metabolism; CTP biosynthesis via de novo pathway; CTP from UDP: step 2/2.

Features

Showing features for binding site, active site.

TypeIDPosition(s)Description
Binding site13CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site13UTP (UniProtKB | ChEBI)
Binding site14-19ATP (UniProtKB | ChEBI)
Binding site71ATP (UniProtKB | ChEBI)
Binding site71Mg2+ (UniProtKB | ChEBI)
Binding site141Mg2+ (UniProtKB | ChEBI)
Binding site148-150CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site188-193CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site188-193UTP (UniProtKB | ChEBI)
Binding site224CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site224UTP (UniProtKB | ChEBI)
Binding site242ATP (UniProtKB | ChEBI)
Binding site354L-glutamine (UniProtKB | ChEBI)
Active site381Nucleophile
Active site381Nucleophile; for glutamine hydrolysis
Binding site382-385L-glutamine (UniProtKB | ChEBI)
Binding site405L-glutamine (UniProtKB | ChEBI)
Binding site462L-glutamine (UniProtKB | ChEBI)
Active site507
Active site509

GO annotations

AspectTerm
Molecular FunctionATP binding
Molecular FunctionCTP synthase activity
Molecular Functionmetal ion binding
Biological Process'de novo' CTP biosynthetic process
Biological Processglutamine metabolic process

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    CTP synthase
  • EC number
  • Alternative names
    • Cytidine 5'-triphosphate synthase
    • Cytidine triphosphate synthetase
      (CTP synthetase
      ; CTPS
      )
    • UTP--ammonia ligase

Gene names

    • Name
      pyrG
    • ORF names
      H6F75_20825

Organism names

  • Taxonomic identifier
  • Strain
    • FACHB-131
  • Taxonomic lineage
    Bacteria > Cyanobacteriota > Cyanophyceae > Nodosilineales > Nodosilineaceae > Nodosilinea

Accessions

  • Primary accession
    A0A8J6RE68

Proteomes

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-267Amidoligase domain
Domain3-266CTP synthase N-terminal
Domain303-526Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    548
  • Mass (Da)
    60,192
  • Last updated
    2022-05-25 v1
  • Checksum
    ABC1F5BA2870DEFB
MTKFVFVTGGVVSSIGKGIVASSLGRLLKSRDYSVSILKLDPYINVDPGTMSPFQHGEVFVTEDGAETDLDLGHYERFTDTAMSRLNSVTTGSIYQAVINRERRGDYQGGTVQVIPHITNEIKERIHRVARNTTPDVVITEIGGTVGDIESLPFLEAIRQFRKDVGRQDVLYMHVTLVPWIASAGELKTKPTQHSVKELRSIGIQPDILVCRCECALPQPMKEKIAEFCDVPAEAVITCQDASSIYEVPLKLEHEGLAHQAIKILALDQRQPHLGQWETLVEGLYSSSRPVDIAIVGKYVSLNDAYLSVVEALRHAAIAHRAALNVRWINSEDIEVNGPDAHLSGVNGILVPGGFGSRGIDGKVQAIRYARERGIPFLGLCLGMQCSVVEWACNVAHLEGADSSEFSPEAANPVISLLPEQQDVVDLGGTMRLGLYPCRLVPDTLASRLYGEEVVYERHRHRYEFNNAYRNLFLESGYQVSGTSPDGRLVEIIELPSHPFFIASQFHPEFQSRPSAPHPLFLGLVNAALETTMSHTPIPLEVGAAVDG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
JACJOF010000030
EMBL· GenBank· DDBJ
MBD1875929.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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