A0A7K1NHR6 · A0A7K1NHR6_9MICC

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.

Type
IDPosition(s)Description
Binding site37CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site37UTP (UniProtKB | ChEBI)
Binding site38-43ATP (UniProtKB | ChEBI)
Binding site95ATP (UniProtKB | ChEBI)
Binding site95Mg2+ (UniProtKB | ChEBI)
Binding site166Mg2+ (UniProtKB | ChEBI)
Binding site173-175CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site213-218CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site213-218UTP (UniProtKB | ChEBI)
Binding site249CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site249UTP (UniProtKB | ChEBI)
Binding site267ATP (UniProtKB | ChEBI)
Binding site380L-glutamine (UniProtKB | ChEBI)
Active site407Nucleophile
Active site407Nucleophile; for glutamine hydrolysis
Binding site408-411L-glutamine (UniProtKB | ChEBI)
Binding site431L-glutamine (UniProtKB | ChEBI)
Binding site492L-glutamine (UniProtKB | ChEBI)
Active site539
Active site541

GO annotations

AspectTerm
Cellular Componentcytosol
Molecular FunctionATP binding
Molecular FunctionCTP synthase activity
Molecular Functionidentical protein binding
Molecular Functionmetal ion binding
Biological Process'de novo' CTP biosynthetic process
Biological Processglutamine metabolic process
Biological Processpyrimidine nucleobase biosynthetic 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
      GK109_02405

Organism names

  • Taxonomic identifier
  • Strain
    • GA104
  • Taxonomic lineage
    Bacteria > Actinomycetota > Actinomycetes > Micrococcales > Micrococcaceae > Pseudarthrobacter

Accessions

  • Primary accession
    A0A7K1NHR6

Proteomes

Subcellular Location

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

Type
IDPosition(s)Description
Region1-24Disordered
Region1-292Amidoligase domain
Domain27-292CTP synthase N-terminal
Domain327-558Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    589
  • Mass (Da)
    63,921
  • Last updated
    2021-04-07 v1
  • Checksum
    370E1FDF5AE34159
MIGSNSVVQRSNSRVNSRFPGSSKTTKHIFVTGGVASSLGKGLTASSLGHLLRARGLSVTMQKLDPYLNVDPGTMNPFQHGEVFVTDDGAETDLDIGHYERFLDENLEGSANVTTGQVYSTVIAKERRGEYLGDTVQVIPHITDEIKRRMRLPAEGKNAPDVIITEIGGTVGDIESQPFLESARQVRQDIGRTNVFFLHVSLVPYIGPSQELKTKPTQHSVAALRSIGIQPEAIVIRSDREVPDAMREKIGRMCDVDIDAVVNAADAPSIYDIPKTLHTQGLDSYIVRALDLPFKDVDWTSWDKLLEAVHNPKHEVEIALVGKYIDLPDAYLSVTEALRAGGFANDTKVKIRWVPSDECETREGAIKALDGVDAICVPGGFGIRGLEGKLGALKFARETKLPVLGLCLGLQCMVIEYARNVVGLEGASSSEFEPDSKYPVIATMEEQLEFVEGRGDLGGTMRLGLYEAKLDAGSVIAETYGKTTVSERHRHRYEVNNKYREQIAAAGLVFSGTSPDGKLVEFVELPADVHPYYVATQAHPELSSRPTRPHPLFAGLVKAALDHQRGSDTAATVGVGAVEAEHSGTVAAK

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
WOWL01000001
EMBL· GenBank· DDBJ
MUU70096.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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