A0A9X4XC46 · A0A9X4XC46_LACJH

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 site13CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site13UTP (UniProtKB | ChEBI)
Binding site14-19ATP (UniProtKB | ChEBI)
Binding site54L-glutamine (UniProtKB | ChEBI)
Binding site71ATP (UniProtKB | ChEBI)
Binding site71Mg2+ (UniProtKB | ChEBI)
Binding site141Mg2+ (UniProtKB | ChEBI)
Binding site148-150CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site188-193CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site188-193UTP (UniProtKB | ChEBI)
Binding site224CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site224UTP (UniProtKB | ChEBI)
Binding site242ATP (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 site465L-glutamine (UniProtKB | ChEBI)
Active site510
Active site512

GO annotations

AspectTerm
Cellular Componentcytosol
Molecular FunctionATP binding
Molecular FunctionCTP synthase activity
Molecular Functionidentical protein binding
Molecular Functionmetal ion binding
Biological ProcessCTP 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
      GJU95_05355
      , NSA17_03145

Organism names

  • Taxonomic identifier
  • Organism
  • Strains
    • LL8
    • DSM 100219
  • Taxonomic lineage
    Bacteria > Bacillota > Bacilli > Lactobacillales > Lactobacillaceae > Lactobacillus

Accessions

  • Primary accession
    A0A9X4XC46

Proteomes

Subcellular Location

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

Type
IDPosition(s)Description
Region1-267Amidoligase domain
Domain3-267CTP synthase N-terminal
Domain305-528Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    540
  • Mass (Da)
    60,519
  • Last updated
    2023-11-08 v1
  • Checksum
    208404E20438EA33
MTKYIFVTGGVVSSLGKGISASSLGRLLKNRGLKVTMQKFDPYINIDPGTMNPYQHGEVYVTDDGTEADLDLGHYERIVDVRTSKYSNVTTGKIYQEVLDKERRGDYHGATVQVIPHITDMIKKKIMRAALTTDSDVIISEIGGTVGDIESTPFMEAIRQMRREVGEENVMYIHCTLVPYLHAAHEMKTKPTQHSVAELRSIGIQPNMLVLRAEKPIAQELKNKISTFTDVPVDRIIESIDAPSLFDLPLAFQAQGMDQKVCDFLHLESPKPEADMEAWKKLDERAKNLKNETTITLVGKYVELEDAYISVTDALQHAGYLYDTKIKVNKVQAEDITEDNIAEIMKDSDGLIVPGGFGTRGLEGMITSIKYAREHDIPFLGICLGMQMASVEFARNVLGLKDANSAEANPDTKNNIIDIMADKRDEENIGGTLRLGLYPATLKKGTKTREAYDDQDVIQERHRHRYEFNNEYREAFEKAGMVFSGVSPDNHLVEIIEIPNKKFFIAAQYHPEFLSRPQRPEGLFKAFIGAASGLPAQHFN

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
JANKAU010000002
EMBL· GenBank· DDBJ
MCR1914419.1
EMBL· GenBank· DDBJ
Genomic DNA
WKKC01000013
EMBL· GenBank· DDBJ
MTE03198.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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