A0A349W2X7 · A0A349W2X7_9SPHI

  • 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.

TypeIDPosition(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 site355L-glutamine (UniProtKB | ChEBI)
Active site382Nucleophile
Active site382Nucleophile; for glutamine hydrolysis
Binding site383-386L-glutamine (UniProtKB | ChEBI)
Binding site406L-glutamine (UniProtKB | ChEBI)
Binding site463L-glutamine (UniProtKB | ChEBI)
Active site508
Active site510

GO annotations

AspectTerm
Molecular FunctionATP binding
Molecular FunctionCTP synthase 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
      DCG88_13610
      , DCS36_03230
      , DCW66_18520

Organism names

  • Taxonomic identifier
  • Organism
  • Strains
    • UBA11116
    • UBA11251
    • UBA8148
  • Taxonomic lineage
    Bacteria > Bacteroidota > Sphingobacteriia > Sphingobacteriales > Sphingobacteriaceae > Sphingobacterium

Accessions

  • Primary accession
    A0A349W2X7

Proteomes

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-267Amidoligase domain
Domain3-267CTP synthase N-terminal
Domain303-527Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    536
  • Mass (Da)
    59,396
  • Last updated
    2018-11-07 v1
  • Checksum
    65F7F5AFFD992F6D
MTKYIFVTGGVTSSLGKGIIAASLAKLLQARGYKVTIQKFDPYINIDPGTLNPYEHGECYVTEDGAETDLDLGHYERFLNVPTSQANNVTTGRIYQHVIQQEREGAYLGKTVQVIPHITDEIKRRMQLLGESGEYDIIITELGGTVGDIESLPFVEAVRQLRWELGANNSLVIHLTLVPYLAAAGELKTKPTQHSVKTLLEYGVQPDILVCRTEHKLSQEIRKKLAQFCNVNINAVVESIDASTIYDVPLLMLKENLDKTALTKLKLSNKNEPDLENWKNFLGKLKNPTSEVNIALVGKYVELPDAYKSIIEGFIHAGATNECKVKVSYIAAESVTKENVAEKLKGMDGVLVAPGFGERGLDGKLNAIQYVRENNIPFFGICLGMQCSVIEFGRNVLGLKDANSFEMDANTSNPVINLMEEQKNITNMGGTMRLGAYDCEIKKGTKAFAIYGKTKISERHRHRYEFNNDYLKQYEAAGMIASGFNPETGLVEIVELKNHPFFVAGQFHPELKSTVANPHPLFVSFVAAALANKKSK

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
DMBY01000279
EMBL· GenBank· DDBJ
HAF35034.1
EMBL· GenBank· DDBJ
Genomic DNA
DMWK01000134
EMBL· GenBank· DDBJ
HAT91418.1
EMBL· GenBank· DDBJ
Genomic DNA
DMZO01000486
EMBL· GenBank· DDBJ
HAU55142.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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