A0A445MSY8 · A0A445MSY8_9BACT

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.

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 site14CTP (UniProtKB | ChEBI); allosteric inhibitor
Binding site14UTP (UniProtKB | ChEBI)
Binding site15-20ATP (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 site350L-glutamine (UniProtKB | ChEBI)
Active site377Nucleophile
Active site377Nucleophile; for glutamine hydrolysis
Binding site378-381L-glutamine (UniProtKB | ChEBI)
Binding site401L-glutamine (UniProtKB | ChEBI)
Binding site458L-glutamine (UniProtKB | ChEBI)
Active site503
Active site505

GO annotations

AspectTerm
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
      PITCH_A140022

Organism names

  • Taxonomic identifier
  • Strain
    • TRIP AH-1
  • Taxonomic lineage
    Bacteria > Thermodesulfobacteriota > Desulfobacteria > Desulfobacterales > Desulfobacteriaceae > Desulfobacterium > environmental samples

Accessions

  • Primary accession
    A0A445MSY8

Interaction

Subunit

Homotetramer.

Family & Domains

Features

Showing features for region, domain.

Type
IDPosition(s)Description
Region1-267Amidoligase domain
Domain4-267CTP synthase N-terminal
Domain302-522Glutamine amidotransferase

Sequence similarities

Belongs to the CTP synthase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    526
  • Mass (Da)
    58,807
  • Last updated
    2019-05-08 v1
  • MD5 Checksum
    A218B24B11D4A303B42966BF72D8962B
MPTKYIIVTGGVLSGLGKGIAAASIGHLLSSKLKIIPIKCDGYLNVDPGTMNPFEHGEVFVLDDGGEVDMDFGHYERFLGVTCKSKWNLTMGKVFDMVRKKERRGDYLGKTVQYIPHVTDVIKNHIFDVSREEQADLVIVEIGGTVGDIENELFLESVRQLRNDVGSQDILYVHLTYVPIPYGVNEQKSKPTQQSVNLLMQRGIFPDVIIGRCSQFLTKEIKAKISSFCNVQPSAVITGLDVEDIYEIPIIFEEEGLPEIIHKKLNIYSPPDLRKWKRLVDNIRNPKREITIAMCGKYTKLEDSYASIIESLNHCSAHLSCKIVLKWIETTDLKDTSFLDEVDGVIIPGGFGSRGTEGKIEVIREARKRNVPFLGLCLGLQLAVIEFARNVCNLEGANSTEMAPDTPHPVIDILPEQKEISDKGGTMRLGGYTAVLKEGSLVHSLYGEREVSERHRHRYEVNPAYHSIMEAGGMVFSGASRDGRLVEFIELPHLKFFVATQAHPELKSRMENPAPLFYGFIKACLN

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
OJIN01000046
EMBL· GenBank· DDBJ
SPD72542.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

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