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Protein

Glutamine synthetase

Gene

glnA

Organism
Staphylococcus aureus
Status
Reviewed-Annotation score: -Protein inferred from homologyi

Functioni

Glutamine synthetase (GS) is an unusual multitasking protein that functions as an enzyme, a transcription coregulator, and a chaperone in ammonium assimilation and in the regulation of genes involved in nitrogen metabolism. It catalyzes the ATP-dependent biosynthesis of glutamine from glutamate and ammonia. Feedback-inhibited GlnA also interacts with and regulates the activity of the transcriptional regulator TnrA. During nitrogen limitation, TnrA is in its DNA-binding active state and turns on the transcription of genes required for nitrogen assimilation. Under conditions of nitrogen excess, feedback-inhibited GlnA forms a stable complex with TnrA, which inhibits its DNA-binding activity. In contrast, feedback-inhibited GlnA acts as a chaperone to stabilize the DNA-binding activity of GlnR, which represses the transcription of nitrogen assimilation genes.By similarity

Catalytic activityi

ATP + L-glutamate + NH3 = ADP + phosphate + L-glutamine.By similarity

Cofactori

Mg2+By similarityNote: Binds 2 Mg2+ ions per subunit.By similarity

Enzyme regulationi

Inhibited by glutamine.By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei64Important for inhibition by glutamineBy similarity1
Metal bindingi134Magnesium 1By similarity1
Metal bindingi136Magnesium 2By similarity1
Binding sitei186ATPBy similarity1
Metal bindingi191Magnesium 2By similarity1
Metal bindingi198Magnesium 2By similarity1
Binding sitei243L-glutamate; via carbonyl oxygenBy similarity1
Metal bindingi247Magnesium 1; via pros nitrogenBy similarity1
Binding sitei251ATPBy similarity1
Binding sitei300L-glutamateBy similarity1
Binding sitei306L-glutamateBy similarity1
Binding sitei318ATPBy similarity1
Binding sitei318L-glutamateBy similarity1
Binding sitei323ATPBy similarity1
Metal bindingi335Magnesium 1By similarity1
Binding sitei337L-glutamateBy similarity1

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionLigase
LigandATP-binding, Magnesium, Metal-binding, Nucleotide-binding

Names & Taxonomyi

Protein namesi
Recommended name:
Glutamine synthetase1 Publication (EC:6.3.1.2By similarity)
Short name:
GS1 Publication
Alternative name(s):
Glutamate--ammonia ligaseBy similarity
Glutamine synthetase I alphaBy similarity
Short name:
GSI alphaBy similarity
Gene namesi
Name:glnA1 Publication
OrganismiStaphylococcus aureus
Taxonomic identifieri1280 [NCBI]
Taxonomic lineageiBacteriaFirmicutesBacilliBacillalesStaphylococcaceaeStaphylococcus

Subcellular locationi

  • Cytoplasm By similarity

GO - Cellular componenti

Keywords - Cellular componenti

Cytoplasm

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001532621 – 446Glutamine synthetaseAdd BLAST446

Interactioni

Subunit structurei

Oligomer of 12 subunits arranged in the form of two hexagons. In its feedback-inhibited form, interacts with TnrA in order to block its DNA-binding activity.By similarity

Structurei

3D structure databases

ProteinModelPortaliP0A040
SMRiP0A040
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni242 – 243L-glutamate bindingBy similarity2

Sequence similaritiesi

Belongs to the glutamine synthetase family.Curated

Phylogenomic databases

eggNOGiENOG4105C5F Bacteria
COG0174 LUCA

Family and domain databases

Gene3Di3.10.20.70, 1 hit
InterProiView protein in InterPro
IPR008147 Gln_synt_b-grasp
IPR036651 Gln_synt_N
IPR014746 Gln_synth/guanido_kin_cat_dom
IPR008146 Gln_synth_cat_dom
IPR027303 Gln_synth_gly_rich_site
IPR004809 Gln_synth_I
IPR027302 Gln_synth_N_conserv_site
PfamiView protein in Pfam
PF00120 Gln-synt_C, 1 hit
PF03951 Gln-synt_N, 1 hit
SMARTiView protein in SMART
SM01230 Gln-synt_C, 1 hit
SUPFAMiSSF54368 SSF54368, 1 hit
SSF55931 SSF55931, 1 hit
TIGRFAMsiTIGR00653 GlnA, 1 hit
PROSITEiView protein in PROSITE
PS00180 GLNA_1, 1 hit
PS00181 GLNA_ATP, 1 hit

Sequencei

Sequence statusi: Complete.

P0A040-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MPKRTFTKDD IRKFAEEENV RYLRLQFTDI LGTIKNVEVP VSQLEKVLDN
60 70 80 90 100
EMMFDGSSIE GFVRIEESDM YLHPDLDTWV IFPWTAGQGK VARLICDVYK
110 120 130 140 150
TDGTPFEGDP RANLKRVLKE MEDLGFTDFN LGPEPEFFLF KLDEKGEPTL
160 170 180 190 200
ELNDDGGYFD LAPTDLGENC RRDIVLELED MGFDIEASHH EVAPGQHEID
210 220 230 240 250
FKYADAVTAC DNIQTFKLVV KTIARKHNLH ATFMPKPLFG VNGSGMHFNV
260 270 280 290 300
SLFKGKENAF FDPNTEMGLT ETAYQFTAGV LKNARGFTAV CNPLVNSYKR
310 320 330 340 350
LVPGYEAPCY IAWSGKNRSP LIRVPSSRGL STRIEVRSVD PAANPYMALA
360 370 380 390 400
AILEAGLDGI KNKLKVPEPV NQNIYEMNRE EREAVGIQDL PSTLYTALKA
410 420 430 440
MRENEVIKKA LGNHIYNQFI NSKSIEWDYY RTQVSEWERD QYMKQY
Length:446
Mass (Da):50,841
Last modified:February 15, 2005 - v1
Checksum:i81713EE654D7E7E6
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X76490 Genomic DNA Translation: CAA54030.1
PIRiT51803
RefSeqiWP_001126603.1, NZ_PJLW01000189.1

Similar proteinsi

Entry informationi

Entry nameiGLN1A_STAAU
AccessioniPrimary (citable) accession number: P0A040
Secondary accession number(s): Q59812
Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 15, 2005
Last sequence update: February 15, 2005
Last modified: March 28, 2018
This is version 67 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program
UniProt is an ELIXIR core data resource
Main funding by: National Institutes of Health