A0A6P0K5T0 · A0A6P0K5T0_9CYAN

  • Protein
    CTP synthase
  • Gene
    pyrG
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    4/5

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 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 site354L-glutamine (UniProtKB | ChEBI)
Active site381Nucleophile
Active site381Nucleophile; for glutamine hydrolysis
Binding site382-385L-glutamine (UniProtKB | ChEBI)
Binding site405L-glutamine (UniProtKB | ChEBI)
Binding site462L-glutamine (UniProtKB | ChEBI)
Active site507
Active site509

GO annotations

AspectTerm
Cellular Componentcytosol
Molecular FunctionATP binding
Molecular FunctionCTP synthase 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
      F6K36_04270

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • SIO3C6
  • Taxonomic lineage
    Bacteria > Cyanobacteriota > Cyanophyceae > Oscillatoriophycideae > Oscillatoriales > Microcoleaceae > Symploca

Accessions

  • Primary accession
    A0A6P0K5T0

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
Domain302-526Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    555
  • Mass (Da)
    61,691
  • Last updated
    2020-10-07 v1
  • Checksum
    2130ADB7BD9F7210
MSKFVFVTGGVVSSIGKGIVAASLGRLLKSRDYSVSILKLDPYINVDPGTMSPFQHGEVFVTADGAETDLDLGHYERFTDTLMSRLNSVTTGSIYQAVINQERRGDYMGGTVQVIPHITNEIKERIYRVASNTNPDVVITEVGGTVGDIESLPFLEAIRQLRKDVGRNNVLYMHVTLLPWIASAGEMKTKPTQHSVKELRSIGIQPDILVCRCDRALQPGIKEKLSEFCDVPVESVITAVDARSIYEVPIILEREGLAEQALDLLNLPQRQPDLRQWQTLIKRLYNLTQQVEIALVGKYIRLSDAYLSVVEALRHAAIAMGIDLTIRWVNSEELEVYGAEHFLTGVSGIIVPGGFGVRGIDGKISAIEYARQNNIPFLGLCLGMQCSVVEWAKNVAMLEDANSAEIDPNATNPVINLLPEQQDIVDLGGTMRLGLYPCRILPNTLASSLYQEGVIYERHRHRYEFNNSYRSLFLETGYAISGTSPDGRLVEIIELAEHPFFLATQFHPEFSSRPSNPHPLFEGFVQAALRQVQGEETNLTVKNNTSREKFPMKAS

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
JAAHHJ010000003
EMBL· GenBank· DDBJ
NEO29662.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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