V5AHB0 · V5AHB0_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 site13CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site13UTP (UniProtKB | ChEBI)
Binding site14-19ATP (UniProtKB | ChEBI)
Binding site71ATP (UniProtKB | ChEBI)
Binding site71Mg2+ (UniProtKB | ChEBI)
Binding site144Mg2+ (UniProtKB | ChEBI)
Binding site151-153CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site191-196CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site191-196UTP (UniProtKB | ChEBI)
Binding site227CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site227UTP (UniProtKB | ChEBI)
Binding site245ATP (UniProtKB | ChEBI)
Binding site356L-glutamine (UniProtKB | ChEBI)
Active site383Nucleophile
Active site383Nucleophile; for glutamine hydrolysis
Binding site384-387L-glutamine (UniProtKB | ChEBI)
Binding site407L-glutamine (UniProtKB | ChEBI)
Binding site473L-glutamine (UniProtKB | ChEBI)
Active site520
Active site522

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
      MOLA814_00574

Organism names

Accessions

  • Primary accession
    V5AHB0

Proteomes

Interaction

Subunit

Homotetramer.

Protein-protein interaction databases

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-270Amidoligase domain
Domain3-270CTP synthase N-terminal
Domain305-539Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    551
  • Mass (Da)
    60,595
  • Last updated
    2014-01-22 v1
  • Checksum
    70806F2D12153666
MTKFVFVTGGVVSSLGKGIASASLAALLESRGLKVTLIKLDPYLNVDPGTMSPFQHGEVYVTDDGAETDLDLGHYERYIETRMKKANNFTTGQIYKSVLEKERRGDYLGKTVQVIPHVTNEIQDFVKRGAGVGTKDAVDVAIVEIGGTVGDIESLPFLEAVRQLSLRMGPNMAAFVHLTYLPWIPTAGELKTKPTQHTVQKLREIGIQPDALLCRADRTIPEEEREKISLFTNVAQWGVISMPDVDTIYKVPRLLHEQGLDGLICDKLRLNTPPAKLARWDNLVREVANPQGEVNVAMVGKYVDLSDSYKSVNEALRHAGLKNHHKVNISYIDSETISAGNVEQLEAFDAILVPGGFGVRGVEGKISTAQFARENKVPYLGICLGMQVATIEFARHVAGLADANSTEFDPQTTTPVIALIDEWQDADGSIQKRSAKSDLGGTMRLGAQSSDVSKNTVAHSIYGDVVTERHRHRYEANVNYLDTLRSAGLVISALTQREQLTEIVELPTAVHPWYVGVQFHPEFKSTPWDGHPLFNAFIKAAIHHKTAKVPT

Keywords

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AYMW01000001
EMBL· GenBank· DDBJ
ESS15000.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

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