A0A0F6RM04 · A0A0F6RM04_MICAE

Function

function

Large subunit of the glutamine-dependent carbamoyl phosphate synthetase (CPSase). CPSase catalyzes the formation of carbamoyl phosphate from the ammonia moiety of glutamine, carbonate, and phosphate donated by ATP, constituting the first step of 2 biosynthetic pathways, one leading to arginine and/or urea and the other to pyrimidine nucleotides. The large subunit (synthetase) binds the substrates ammonia (free or transferred from glutamine from the small subunit), hydrogencarbonate and ATP and carries out an ATP-coupled ligase reaction, activating hydrogencarbonate by forming carboxy phosphate which reacts with ammonia to form carbamoyl phosphate.

Caution

Lacks conserved residue(s) required for the propagation of feature annotation.

Catalytic activity

Cofactor

Mg2+ (UniProtKB | Rhea| CHEBI:18420 )

Mn2+ (UniProtKB | Rhea| CHEBI:29035 )

Note: Binds 4 Mg2+ or Mn2+ ions per subunit.

Pathway

Amino-acid biosynthesis; L-arginine biosynthesis; carbamoyl phosphate from bicarbonate: step 1/1.
Pyrimidine metabolism; UMP biosynthesis via de novo pathway; (S)-dihydroorotate from bicarbonate: step 1/3.

Features

Showing features for binding site.

TypeIDPosition(s)Description
Binding site117ATP 1 (UniProtKB | ChEBI)
Binding site158ATP 1 (UniProtKB | ChEBI)
Binding site164ATP 1 (UniProtKB | ChEBI)
Binding site165ATP 1 (UniProtKB | ChEBI)
Binding site197ATP 1 (UniProtKB | ChEBI)
Binding site199ATP 1 (UniProtKB | ChEBI)
Binding site204ATP 1 (UniProtKB | ChEBI)
Binding site230ATP 1 (UniProtKB | ChEBI)
Binding site231ATP 1 (UniProtKB | ChEBI)
Binding site232ATP 1 (UniProtKB | ChEBI)
Binding site274ATP 1 (UniProtKB | ChEBI)
Binding site274Mg2+ 1 (UniProtKB | ChEBI)
Binding site274Mn2+ 1 (UniProtKB | ChEBI)
Binding site288ATP 1 (UniProtKB | ChEBI)
Binding site288Mg2+ 1 (UniProtKB | ChEBI)
Binding site288Mg2+ 2 (UniProtKB | ChEBI)
Binding site288Mn2+ 2 (UniProtKB | ChEBI)
Binding site288Mn2+ 1 (UniProtKB | ChEBI)
Binding site290Mg2+ 2 (UniProtKB | ChEBI)
Binding site290Mn2+ 2 (UniProtKB | ChEBI)
Binding site710ATP 2 (UniProtKB | ChEBI)
Binding site749ATP 2 (UniProtKB | ChEBI)
Binding site751ATP 2 (UniProtKB | ChEBI)
Binding site756ATP 2 (UniProtKB | ChEBI)
Binding site782ATP 2 (UniProtKB | ChEBI)
Binding site783ATP 2 (UniProtKB | ChEBI)
Binding site784ATP 2 (UniProtKB | ChEBI)
Binding site785ATP 2 (UniProtKB | ChEBI)
Binding site825ATP 2 (UniProtKB | ChEBI)
Binding site825Mg2+ 3 (UniProtKB | ChEBI)
Binding site825Mn2+ 3 (UniProtKB | ChEBI)
Binding site837ATP 2 (UniProtKB | ChEBI)
Binding site837Mg2+ 4 (UniProtKB | ChEBI)
Binding site837Mg2+ 3 (UniProtKB | ChEBI)
Binding site837Mn2+ 3 (UniProtKB | ChEBI)
Binding site837Mn2+ 4 (UniProtKB | ChEBI)
Binding site839Mg2+ 4 (UniProtKB | ChEBI)
Binding site839Mn2+ 4 (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentcytoplasm
Molecular FunctionATP binding
Molecular Functioncarbamoyl-phosphate synthase (ammonia) activity
Molecular Functioncarbamoyl-phosphate synthase (glutamine-hydrolyzing) activity
Molecular Functionmetal ion binding
Biological Process'de novo' UMP biosynthetic process
Biological Processarginine biosynthetic process
Biological Processglutamine metabolic process

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Carbamoyl phosphate synthase large chain
  • EC number
  • Alternative names
    • Carbamoyl phosphate synthetase ammonia chain

Gene names

    • Name
      carB
    • ORF names
      MYAER_2454

Organism names

  • Taxonomic identifier
  • Strain
    • NIES-2549
  • Taxonomic lineage
    Bacteria > Cyanobacteriota > Cyanophyceae > Oscillatoriophycideae > Chroococcales > Microcystaceae > Microcystis

Accessions

  • Primary accession
    A0A0F6RM04

Proteomes

Subcellular Location

Interaction

Subunit

Composed of two chains; the small (or glutamine) chain promotes the hydrolysis of glutamine to ammonia, which is used by the large (or ammonia) chain to synthesize carbamoyl phosphate. Tetramer of heterodimers (alpha,beta)4.

Family & Domains

Features

Showing features for region, domain.

TypeIDPosition(s)Description
Region1-391Carboxyphosphate synthetic domain
Domain121-317ATP-grasp
Region392-541Oligomerization domain
Domain674-866ATP-grasp
Domain933-1069MGS-like
Region933-1069Allosteric domain

Domain

The large subunit is composed of 2 ATP-grasp domains that are involved in binding the 2 ATP molecules needed for carbamoyl phosphate synthesis. The N-terminal ATP-grasp domain (referred to as the carboxyphosphate synthetic component) catalyzes the ATP-dependent phosphorylation of hydrogencarbonate to carboxyphosphate and the subsequent nucleophilic attack by ammonia to form a carbamate intermediate. The C-terminal ATP-grasp domain (referred to as the carbamoyl phosphate synthetic component) then catalyzes the phosphorylation of carbamate with the second ATP to form the end product carbamoyl phosphate. The reactive and unstable enzyme intermediates are sequentially channeled from one active site to the next through the interior of the protein over a distance of at least 96 A.

Sequence similarities

Belongs to the CarB family.

Keywords

Phylogenomic databases

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    1,069
  • Mass (Da)
    117,224
  • Last updated
    2015-07-22 v1
  • Checksum
    B63F6866DAC5AB18
MGAGPIVIGQACEFDYSGTQACKALREEGYEVILVNSNPASIMTDPEMADRTYIEPILPEIVEKIIAKERPDAILPTMGGQTALNTAVALAKSGVLEKYNVELIGAKLPAIEKAEDRELFKQAMEKIGVPVCPSGIANNLEEAKAIAHQIGSYPLIIRPAFTLGGTGGGIAYNQEEFEPMAQYGLDCSPTSQILVEKSLIGWKEYELEVMRDLADNVVIICSIENFDAMGVHTGDSITVAPAQTLTDKEYQRLRDYSKAIIREIGVETGGSNIQFSVNPTNGDVIVIEMNPRVSRSSALASKATGFPIAKFAAKLAVGYTLDEIPNDITKKTPASFEPTIDYVVTKIPRFAFEKFPGSQPILTTQMKSVGEAMAIGRTFQESFQKALRSLETGRFGFGCDKVETLPPLSEVRASLRTPNPERVYSIYHAFKLGMNGEEIHELTGIDPWFLDKLADLMETEKFLKRTPLKSLRQEDLFAIKQQGFSDRQIAFATNSSEDEVRSYRKGLGIIPVYKMVDTCAAEFEALTPYYYSTYERVESEVLPSDKRKVMILGGGPNRIGQGIEFDYCCCHAAFSLSNAGFETIMVNSNPETVSTDYDTSDRLYFEPLTKEDVLNIIEAEQPEGLIIQFGGQTPLKLAVPLQKYLESPNCPVNTKIWGTSPDSIDAAEDRERFEKILRELDIRQPPNGIARSFQESQAVAKRIGYPVVVRPSYVLGGRAMEIVYSDSELERYMKYAVQIEPDHPILIDKFLENAIEVDVDALSDTTGTVVIGGLMEHIEQAGVHSGDSACSIPHTSLSAPVLTTIRQWTVELAKALKVIGLMNIQYAVQGETVYILEANPRASRTVPYVSKATGVPLAKVASLVMSGKTLAELGIISEAIPRHIAVKEAVLPFQKFPGADTLLGPEMRSTGEVMGIDSDFGKAFAKAEMAAGVILATSGTVFVSMNDRDKTPMVPVVKDLQSLGFRVVATSGTREVLLENGCENIDLVLKIHEGRPHVIDWIKNDWIQFIVNTPSGEESQNDGRQIRRTALDYKLPIITTIAGAKATVAALKSLQSQPLEVKALQDYLA

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
CP011304
EMBL· GenBank· DDBJ
AKE64798.1
EMBL· GenBank· DDBJ
Genomic DNA

Genome annotation databases

Similar Proteins

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