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Protein

Glutamine synthetase

Gene

glnA

Organism
Staphylococcus aureus
Status
Reviewed-Annotation score: Annotation score: 3 out of 5-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

Protein-protein interaction databases

STRINGi93062.SACOL1329.

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.
3.30.590.10. 1 hit.
InterProiView protein in InterPro
IPR008147. Gln_synt_b-grasp.
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.
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_MLQK01000005.1.

Genome annotation databases

GeneIDi28381131.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X76490 Genomic DNA. Translation: CAA54030.1.
PIRiT51803.
RefSeqiWP_001126603.1. NZ_MLQK01000005.1.

3D structure databases

ProteinModelPortaliP0A040.
SMRiP0A040.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi93062.SACOL1329.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi28381131.

Phylogenomic databases

eggNOGiENOG4105C5F. Bacteria.
COG0174. LUCA.

Family and domain databases

Gene3Di3.10.20.70. 1 hit.
3.30.590.10. 1 hit.
InterProiView protein in InterPro
IPR008147. Gln_synt_b-grasp.
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.
TIGRFAMsiTIGR00653. GlnA. 1 hit.
PROSITEiView protein in PROSITE
PS00180. GLNA_1. 1 hit.
PS00181. GLNA_ATP. 1 hit.
ProtoNetiSearch...

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 15, 2017
This is version 60 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.