B7X5X1 · B7X5X1_COMTK

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 site25CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site25UTP (UniProtKB | ChEBI)
Binding site26-31ATP (UniProtKB | ChEBI)
Binding site83ATP (UniProtKB | ChEBI)
Binding site83Mg2+ (UniProtKB | ChEBI)
Binding site156Mg2+ (UniProtKB | ChEBI)
Binding site163-165CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site203-208CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site203-208UTP (UniProtKB | ChEBI)
Binding site239CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site239UTP (UniProtKB | ChEBI)
Binding site257ATP (UniProtKB | ChEBI)
Binding site369L-glutamine (UniProtKB | ChEBI)
Active site396Nucleophile
Active site396Nucleophile; for glutamine hydrolysis
Binding site397-400L-glutamine (UniProtKB | ChEBI)
Binding site420L-glutamine (UniProtKB | ChEBI)
Binding site486L-glutamine (UniProtKB | ChEBI)
Active site533
Active site535

GO annotations

AspectTerm
Cellular Componentcytosol
Molecular FunctionATP binding
Molecular FunctionCTP synthase activity
Molecular Functionglutaminase 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
      CtesDRAFT_PD3881

Organism names

Accessions

  • Primary accession
    B7X5X1

Proteomes

Subcellular Location

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

Type
IDPosition(s)Description
Region1-282Amidoligase domain
Domain15-282CTP synthase N-terminal
Domain317-552Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    565
  • Mass (Da)
    62,592
  • Last updated
    2009-03-03 v1
  • Checksum
    C1FBD98AD3F63E84
MNCPYPPPPKKDMTKFVFVTGGVVSSLGKGIASASLAAILESRGLKVTLIKLDPYINVDPGTMSPFQHGEVFVTDDGAETDLDLGHYERFIETRMRQSNNFTTGRIYQSVLEKERRGDYLGKTVQVIPHVTNEIQEYIKRGAGLGTDHEVDVAICEVGGTVGDIESLPFLEAARQLALKLGPNNSAFVHLTYLPFIETAGELKTKPTQHTVQKLREIGIQPDALLCRAKHQVPDEEKEKISLFTNVPEWGVISMWDVDTIYKVPRMLHEQGLDGLICDKLRLNTPPTNLKRWDDLVYETEHPQGEVKIAMVGKYVELSDAYKSVNEALKHAGMRNHVRVKITHVDSETIHDADASKLLKDYDGILVPGGFGSRGVEGKISTAKFARENKVPYLGICLGMQVATIEYARHVAGLAGANSTEFDSATPNPVIALITEWKDADGTIKTRDENSDLGGTMRLGAQSSDVQKGTLAHSIYGDVVTERHRHRYEANTQYLDQLRDAGLVISALTQREQLTEIVELPAKVHPWYIGVQFHPEFKSTPWDGHPLFNAFIKAAMDNKAQSGKKA

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AAUJ02000001
EMBL· GenBank· DDBJ
EED68933.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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