A0A2D9I6K7 · A0A2D9I6K7_9PROT

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 site14CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site14UTP (UniProtKB | ChEBI)
Binding site15-20ATP (UniProtKB | ChEBI)
Binding site55L-glutamine (UniProtKB | ChEBI)
Binding site72ATP (UniProtKB | ChEBI)
Binding site72Mg2+ (UniProtKB | ChEBI)
Binding site140Mg2+ (UniProtKB | ChEBI)
Binding site147-149CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site187-192CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site187-192UTP (UniProtKB | ChEBI)
Binding site223CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site223UTP (UniProtKB | ChEBI)
Binding site241ATP (UniProtKB | ChEBI)
Binding site357L-glutamine (UniProtKB | ChEBI)
Active site384Nucleophile
Active site384Nucleophile; for glutamine hydrolysis
Binding site385-388L-glutamine (UniProtKB | ChEBI)
Binding site408L-glutamine (UniProtKB | ChEBI)
Binding site473L-glutamine (UniProtKB | ChEBI)
Active site518
Active site520

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
      CMM81_20160

Organism names

Accessions

  • Primary accession
    A0A2D9I6K7

Proteomes

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-266Amidoligase domain
Domain4-266CTP synthase N-terminal
Domain304-537Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    546
  • Mass (Da)
    60,644
  • Last updated
    2018-04-25 v1
  • Checksum
    DA8A377AB65BAF40
MSARYIFITGGVVSSLGKGLASAALGALLQARGYKVRLRKLDPYLNVDPGTMSPYQHGECYVTDDGAETDLDLGHYERFTGVPARQSDNVTTGRIYSDVIAKERRGDYLGGTVQVIPHVTDAIRDFVVSDITDEDFVLCEIGGTVGDIEGLPFLEAIRQLGNELGRERACYIHCTLLPYIGAAGELKTKPTQHSVKELLSVGIQPDILLCRAERDIPQGEKRKIALFCNVRESRVISALDVDTIYAVPLTYHREGLDVEVLSYFNMMKEGQEEEIDLSRWSDITRTVRAPEGEVTIAVVGKYTVLLDAYKSLAEALVHGGIANNVRVKLNWVESEIFETDDPVPYLENVHGILVPGGFGERGSEGKIQACRFARERNIPYFGICFGMQMAVIEAARHLAGIEDASSTEFGPAKHPVVGLLTEWKKGNRVETRGENDDKGGTMRLGAYPCILEPGSKTQEIYGERQIYERHRHRYEVNVGYREKLEAVGLKFTGMSPDGILPEIVEREDHPWFIGVQFHPELKSKPFEPHPLFAGFIEAAVKTSRLV

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
NZSA01000094
EMBL· GenBank· DDBJ
MAO93840.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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