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Protein

Glutamine synthetase

Gene

glnA2

Organism
Mycobacterium bovis (strain ATCC BAA-935 / AF2122/97)
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
Sitei61Important for inhibition by glutamineBy similarity1
Metal bindingi132Magnesium 1By similarity1
Metal bindingi134Magnesium 2By similarity1
Binding sitei184ATPBy similarity1
Metal bindingi189Magnesium 2By similarity1
Metal bindingi196Magnesium 2By similarity1
Binding sitei241L-glutamate; via carbonyl oxygenBy similarity1
Metal bindingi245Magnesium 1; via pros nitrogenBy similarity1
Binding sitei249ATPBy similarity1
Binding sitei298L-glutamateBy similarity1
Binding sitei304L-glutamateBy similarity1
Binding sitei316ATPBy similarity1
Binding sitei316L-glutamateBy similarity1
Binding sitei321ATPBy similarity1
Metal bindingi336Magnesium 1By similarity1
Binding sitei338L-glutamateBy similarity1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Nucleotide bindingi247 – 249ATPBy similarity3

GO - Molecular functioni

GO - Biological processi

Keywordsi

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

Enzyme and pathway databases

BRENDAi6.3.1.2. 3494.

Names & Taxonomyi

Protein namesi
Recommended name:
Glutamine synthetaseBy similarity (EC:6.3.1.2By similarity)
Short name:
GSBy similarity
Alternative name(s):
Glutamate--ammonia ligaseBy similarity
Glutamine synthetase I alphaBy similarity
Short name:
GSI alphaBy similarity
Gene namesi
Name:glnA2By similarity
Ordered Locus Names:BQ2027_MB2246C
OrganismiMycobacterium bovis (strain ATCC BAA-935 / AF2122/97)
Taxonomic identifieri233413 [NCBI]
Taxonomic lineageiBacteriaActinobacteriaCorynebacterialesMycobacteriaceaeMycobacteriumMycobacterium tuberculosis complex
Proteomesi
  • UP000001419 Componenti: Chromosome

Subcellular locationi

  • Cytoplasm By similarity

GO - Cellular componenti

Keywords - Cellular componenti

Cytoplasm

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001532451 – 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

ProteinModelPortaliP64246.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Sequence similaritiesi

Belongs to the glutamine synthetase family.Curated

Phylogenomic databases

HOGENOMiHOG000005156.
KOiK01915.
OMAiTFYTHPE.

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.
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.
PROSITEiView protein in PROSITE
PS00181. GLNA_ATP. 1 hit.

Sequencei

Sequence statusi: Complete.

P64246-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MDRQKEFVLR TLEERDIRFV RLWFTDVLGF LKSVAIAPAE LEGAFEEGIG
60 70 80 90 100
FDGSSIEGFA RVSESDTVAH PDPSTFQVLP WATSSGHHHS ARMFCDITMP
110 120 130 140 150
DGSPSWADPR HVLRRQLTKA GELGFSCYVH PEIEFFLLKP GPEDGSVPVP
160 170 180 190 200
VDNAGYFDQA VHDSALNFRR HAIDALEFMG ISVEFSHHEG APGQQEIDLR
210 220 230 240 250
FADALSMADN VMTFRYVIKE VALEEGARAS FMPKPFGQHP GSAMHTHMSL
260 270 280 290 300
FEGDVNAFHS ADDPLQLSEV GKSFIAGILE HACEISAVTN QWVNSYKRLV
310 320 330 340 350
QGGEAPTAAS WGAANRSALV RVPMYTPHKT SSRRVEVRSP DSACNPYLTF
360 370 380 390 400
AVLLAAGLRG VEKGYVLGPQ AEDNVWDLTP EERRAMGYRE LPSSLDSALR
410 420 430 440
AMEASELVAE ALGEHVFDFF LRNKRTEWAN YRSHVTPYEL RTYLSL
Length:446
Mass (Da):49,608
Last modified:October 11, 2004 - v1
Checksum:i86F163FD017829DD
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
LT708304 Genomic DNA. Translation: SIU00854.1.
RefSeqiNP_855895.1. NC_002945.3.
WP_003411482.1. NC_002945.4.

Genome annotation databases

EnsemblBacteriaiCDO43500; CDO43500; Mb2246c.
KEGGimbo:Mb2246c.
PATRICifig|233413.5.peg.2463.

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.

Entry informationi

Entry nameiGLN1A_MYCBO
AccessioniPrimary (citable) accession number: P64246
Secondary accession number(s): A0A1R3Y2P8, Q10378, X2BK57
Entry historyiIntegrated into UniProtKB/Swiss-Prot: October 11, 2004
Last sequence update: October 11, 2004
Last modified: July 5, 2017
This is version 81 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families