A0A2G6PBU7 · A0A2G6PBU7_UNCDL

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 site19CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site19UTP (UniProtKB | ChEBI)
Binding site20-25ATP (UniProtKB | ChEBI)
Binding site60L-glutamine (UniProtKB | ChEBI)
Binding site77ATP (UniProtKB | ChEBI)
Binding site77Mg2+ (UniProtKB | ChEBI)
Binding site147Mg2+ (UniProtKB | ChEBI)
Binding site154-156CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site194-199CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site194-199UTP (UniProtKB | ChEBI)
Binding site230CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site230UTP (UniProtKB | ChEBI)
Binding site360L-glutamine (UniProtKB | ChEBI)
Active site387Nucleophile
Active site387Nucleophile; for glutamine hydrolysis
Binding site388-391L-glutamine (UniProtKB | ChEBI)
Binding site411L-glutamine (UniProtKB | ChEBI)
Binding site468L-glutamine (UniProtKB | ChEBI)
Active site513
Active site515

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
      CSA15_00165

Organism names

Accessions

  • Primary accession
    A0A2G6PBU7

Proteomes

Subcellular Location

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-273Amidoligase domain
Domain9-273CTP synthase N-terminal
Domain309-532Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    543
  • Mass (Da)
    60,272
  • Last updated
    2018-01-31 v1
  • Checksum
    1BAF6BB3F568E543
MPSKKNRTKYIFVTGGVVSSLGKGISAASIGLLLKQRGLKVSILKLDPYLNLDPGTMSPYQHGEVFVTDDGAETDLDLGHYERFIDENMGRMNNTTSGQIYESVLAKERKGDYLGGTVQVIPHITNEIKSKIYDVAKKTGADVILIEIGGTVGDIESLPFIEAIRQFRFDVGPENTVYIHVTYIPYVRAAGEMKTKPTQHSVKNLLELGIQPEILICRSEEKLPKENKEKIALFCNVEKKCVIDAADSPSIYEVPLSFYKSKVDEIILNKLNLEAGDADLANWKKVVRRIKNPQKDVKIAIVGKYVELGDAYKSILEAFIHAGSENNAKVNINFVASEDIEKNGPSELLSDSDGILVPGGFGHRGIEGKLLAVKFARENNIPFFGICLGMQCAVIEFARNVGGMKNANSTEFARKLKYPVIDLMADQKKVKSKGGTMRLGSFGCKLSKGTKLYKAYGTENIKERHRHRFEVNNSFIGSLEDCGLVASGRNTELNLVEAIELPEHPWFVGVQYHPELKSRVMKAHPLFRDFVKASIAEKKKRSN

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
PDTR01000006
EMBL· GenBank· DDBJ
PIE82028.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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