A0A292IGV5 · A0A292IGV5_9MOLU

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.

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 site18CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site18UTP (UniProtKB | ChEBI)
Binding site19-24ATP (UniProtKB | ChEBI)
Binding site59L-glutamine (UniProtKB | ChEBI)
Binding site76ATP (UniProtKB | ChEBI)
Binding site76Mg2+ (UniProtKB | ChEBI)
Binding site146Mg2+ (UniProtKB | ChEBI)
Binding site153-155CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site193-198CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site193-198UTP (UniProtKB | ChEBI)
Binding site229CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site229UTP (UniProtKB | ChEBI)
Binding site247ATP (UniProtKB | ChEBI)
Binding site361L-glutamine (UniProtKB | ChEBI)
Active site388Nucleophile
Active site388Nucleophile; for glutamine hydrolysis
Binding site389-392L-glutamine (UniProtKB | ChEBI)
Binding site412L-glutamine (UniProtKB | ChEBI)
Binding site467L-glutamine (UniProtKB | ChEBI)
Active site512
Active site514

GO annotations

AspectTerm
Molecular FunctionATP binding
Molecular FunctionCTP synthase activity
Molecular Functionglutaminase 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
      MAMA39_00330

Organism names

Accessions

  • Primary accession
    A0A292IGV5

Proteomes

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-272Amidoligase domain
Domain8-272CTP synthase N-terminal
Domain310-531Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    543
  • Mass (Da)
    61,446
  • Last updated
    2017-12-20 v1
  • Checksum
    6FEE9ABB5DE79C81
MELNRKTKFIFVTGGVFSSLGKGLSAASVGSILTQLGLNVSAIKLDPYLNVDPGTMSPYQHGEVFVTKDGAETDLDLGHYERLLNKELTRGSSITAGTIYNRVIQNERQGKYLGKTIQVVPHVTDEIKKSVYCLANEINADVILIEIGGTVGDIESLPFIEAMRQIRWELPQENTLVIHTVPVIELQTTNEMKTKPLQHSTHHLRNLGITPDFLFVRSKSSLPIEIKTKIAAMCSIRIEHIFSCIDVSNLYLLPEHLYEQKVHEEIAKILNLKYQTCHLSEKWLSFTNSIVAKKTSLIKIALVGKYTEFKDAYMSLHESLKIASYHQNVDLHIEWINSVKINKNEMIKILKTVDGLVIPGGFDKRGIDGKLMAIKYARENNLPFLGICLGMQLACIEFARNVLKLASANSTEFDKTTPDNVFDLITKTKVDVGGSLRLGNYSCSIKPNTLAAKLYQSDKVIRRHRHRYEFNNTYLKKFEQAGFQFSGFYSEKNLQEIIEIPNHPFFIACQYHPEFNSNPYCPEPLFVGLIESARKYHQKSGQK

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
HG937516
EMBL· GenBank· DDBJ
CDN40159.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
We'd like to inform you that we have updated our Privacy Notice to comply with Europe’s new General Data Protection Regulation (GDPR) that applies since 25 May 2018.
FeedbackHelp