KpATCC43816 Protein target profile

glutamine synthetase, type I

Accession: VK055_3295

Gene: AIK81856.1 glnA 3D evidence: AlphaFold DB model + ColabFold model Metabolism 1 reaction UniProt A0A0H3GG67
Length 469
Pocket druggability (P2Rank · AlphaFold DB model) 0.806
Metabolic reactions 1
Chokepoint No
Direct ligand evidence 0 62 total records
Functional annotation 1 EC 9 GO
Target summary

Promising target candidate with multiple supporting evidence streams.

Automated synthesis of the evidence currently loaded. Review the underlying records before prioritizing this protein.

Terms and data sources used on this page

PDB: experimentally determined structures from the Protein Data Bank. These are the strongest structural evidence, but may cover only part of the protein.

AlphaFold DB model: a precomputed predicted structure downloaded from AlphaFold Database/UniProt, not an experiment performed here.

ColabFold model: a predicted structure generated for this workspace; interpret it with coverage and confidence.

pLDDT: confidence score for predicted structures. High values support local geometry; low values mean the region should not drive pocket interpretation.

FPocket / P2Rank: software tools that predict possible ligand-binding pockets on a 3D structure. They are useful screening signals, not experimental validation.

Druggability: a pocket-based estimate of whether a small molecule could bind productively. It does not mean a drug already exists.

PDB ligand: a compound observed in an experimental structure. Direct same-protein records are stronger than homolog-transferred records.

ChEMBL: a public database of measured compound bioactivity. Direct entries are stronger than entries transferred from similar proteins.

ZINC: a purchasable-compound database. Here it marks proposed candidates from chemical similarity, not measured binders.

LigQ / LigQ_2: an internal Target pipeline step that gathers PDB, ChEMBL, and ZINC ligand evidence for each protein.

Off-target: sequence similarity to proteins we prefer not to hit, such as human proteins or beneficial gut microbiome proteins.

DEG: Database of Essential Genes. A match suggests the protein resembles genes known to be essential in other organisms.

Roary / CoreCruncher: pan-genome tools used to decide whether a gene is core across analyzed strains or accessory/strain-specific.

EC / GO: functional annotations: EC describes enzyme reactions; GO describes biological process, molecular function, or cellular component.

KEGG pathway: a curated metabolic route label used here to group reactions imported from the metabolic model.

Chokepoint: a metabolic reaction that is the only producer or consumer of a metabolite in the imported model.

Prioritization evidence

Selectivity, essentiality, structural confidence, conservation, and predicted binding-site evidence.

Off-target risk

Human off-target
Hit
Human identity (%)
27.548 Lower values reduce human off-target concern.
Human E-value
1.8e-12
Gut microbiome similarity
8.7% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
95.736 Higher values support similarity to known essential genes.
DEG E-value
0.0 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
95.34 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

P2Rank's binding-site probability is the primary druggability signal shown across the app; FPocket's druggability score is shown alongside it for comparison. Both estimate small-molecule pocket quality after applying the curated structure priority — neither is experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

Druggability (P2Rank) 0.806
Structure A0A0H3GG67
Pocket Pocket 1
Druggability (FPocket) 0.619
Structure A0A0H3GG67
Pocket Pocket 1
ColabFold model
P2Rank 0.808 · Pocket 1
FPocket 0.534 · Pocket 20
Core conservation Accessory gene
Roary accessory
CoreCruncher core
Gut microbiome 413 / 4744 genomes with a hit
Prevalence 8.7%

Metabolic context

Reactions catalyzed, pathway membership, and centrality in the genome-scale metabolic network.

Explore metabolic network
Relative network centrality 0.0% more central than 0.0% of genes in this genome
Chokepoint Not a chokepoint
Catalyzed reaction

1 reaction mapped to this gene in the metabolic model. Open the full network to see each one, with substrates/products and the reaction-reaction map.

Imported from KpATCC43816.sbml · 2026-07-09

Sequence

Primary amino-acid sequence viewer.

MSAEHVLTMLNEHEVKFVDLRFTDTKGKEQHVTIPSHQVNAEFFEEGKMFDGSSIGGWKGINESDMVLMPDASTAVIDPFYEEPTLIIRCDILEPGTLQGYDRDPRSIAKRAEEYLRATGIADTVLFGPEPEFFLFDDIRFGASISGSHVAIDDIEGAWNSSTKYEGGNKGHRPGVKGGYFPVPPVDSSQDIRSTMCMIMEEMGLVVEAHHHEVATAGQNEVATRFNTMTKKADEIQIYKYVVHNVAHRFGKTATFMPKPMFGDNGSGMHCHMSLAKNGTNLFSGDKYAGLSEQALFYIGGVIKHAKAINALANPTTNSYKRLVPGYEAPVMLAYSARNRSASIRIPVVTSPKARRIEVRFPDPAANPYLCFAALLMAGLDGIKNKIHPGEAMDKNLYDLPPEEAKEIPQVAGSLEEALQALDADREFLTAGGVFTNDAIDAYIALRMEENDRVRMTPHPVEFELYYSV

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 9 GO

Subcellular localization

Localization
Cytoplasmic

Enzyme Commission (EC)

1

Gene Ontology (GO)

9
  • GO:0003824 Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic.
  • GO:0004356 Catalysis of the reaction: ATP + L-glutamate + NH4+ = ADP + H+ + L-glutamine + phosphate.
  • GO:0006807 OBSOLETE. The chemical reactions and pathways involving organic or inorganic compounds that contain nitrogen.
  • GO:0006542 OBSOLETE. The chemical reactions and pathways resulting in the formation of glutamine, 2-amino-4-carbamoylbutanoic acid.
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0046872 Binding to a metal ion.
  • GO:0019740 A series of processes that forms an integrated mechanism by which a cell or an organism detects the depletion of primary nitrogen source, usually ammonia, and then activates genes to scavenge the last traces of the primary nitrogen source and to transport and metabolize alternative nitrogen sources. The utilization process begins when the cell or organism detects nitrogen levels, includes the activation of genes whose products detect, transport or metabolize nitrogen-containing substances, and ends when nitrogen is incorporated into the cell or organism's metabolism.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

28 records
Show feature table
Start End DB Term Name
102 379 SMART SM01230 Gln_synt_C_2
102 379 InterPro IPR008146 Glutamine synthetase, catalytic domain
2 468 PANTHER PTHR43407 GLUTAMINE SYNTHETASE
386 398 ProSitePatterns PS00182 Glutamine synthetase class-I adenylation site.
386 398 InterPro IPR001637 Glutamine synthetase class-I, adenylation site
102 468 SUPERFAMILY SSF55931 Glutamine synthetase/guanido kinase
102 468 InterPro IPR014746 Glutamine synthetase/guanido kinase, catalytic domain
259 274 ProSitePatterns PS00181 Glutamine synthetase putative ATP-binding region signature.
259 274 InterPro IPR027303 Glutamine synthetase, glycine-rich site
105 457 FunFam G3DSA:3.30.590.10:FF:000001 Glutamine synthetase
50 68 ProSitePatterns PS00180 Glutamine synthetase signature 1.
50 68 InterPro IPR027302 Glutamine synthetase, N-terminal conserved site
105 457 Gene3D G3DSA:3.30.590.10 Glutamine synthetase/guanido kinase, catalytic domain
13 97 ProSiteProfiles PS51986 Glutamine synthetase (GS) beta-grasp domain profile.
13 97 InterPro IPR008147 Glutamine synthetase, N-terminal domain
105 469 ProSiteProfiles PS51987 Glutamine synthetase (GS) catalytic domain profile.
105 469 InterPro IPR008146 Glutamine synthetase, catalytic domain
3 99 SUPERFAMILY SSF54368 Glutamine synthetase, N-terminal domain
3 99 InterPro IPR036651 Glutamine synthetase, N-terminal domain superfamily
14 95 Pfam PF03951 Glutamine synthetase, beta-Grasp domain
14 95 InterPro IPR008147 Glutamine synthetase, N-terminal domain
1 103 Gene3D G3DSA:3.10.20.70 -
1 103 InterPro IPR036651 Glutamine synthetase, N-terminal domain superfamily
4 468 NCBIfam TIGR00653 glutamine synthetase, type I
4 468 InterPro IPR004809 Glutamine synthetase type I
103 466 Pfam PF00120 Glutamine synthetase, catalytic domain
103 466 InterPro IPR008146 Glutamine synthetase, catalytic domain
1 104 FunFam G3DSA:3.10.20.70:FF:000001 Glutamine synthetase

3D structure

Selected loaded structure. Experimental PDB entries may cover only a portion of the sequence; AlphaFold DB and ColabFold models typically cover the full protein but remain computational predictions.

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Pocket score High Medium Low
How colors and pocket overlays are used
Uniform protein color marks the displayed model as a single molecular object.
Experimental PDB structures may be colored by chain to distinguish subunits or copies present in the file.
Pocket colors and alpha spheres are evidence overlays for predicted binding cavities; they are not alternative protein chains.
'Alpha spheres' is FPocket's own cavity-shape geometry, imported when available and aligned with the loaded structure.
'Pocket atoms'/'Predicted site atoms' show the pocket's residue atoms instead: P2Rank reports residues rather than alpha spheres, and FPocket falls back to this when alpha-sphere geometry is unavailable or doesn't align.
'No pocket geometry' means neither alpha spheres nor residue-position data could be found for that pocket; the layer just highlights the same residues as 'Nearby residues'.
Pocket details Inspect a specific pocket, or open the full viewer

Binding pockets · P2Rank

Druggability (P2Rank): high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Pocket 1 P2Rank #1
0.806
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Surrounding area
Pocket 2 P2Rank #2
0.361
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Surrounding area
Pocket 3 P2Rank #3
0.169
Likely same site as FPocket 3 1.0 Å 13 shared residues 100% of smaller site
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Surrounding area
Pocket 4 P2Rank #4
0.082
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Surrounding area

Binding pockets · FPocket

Druggability (FPocket): high ≥ 0.7 · medium 0.4–0.69 · low < 0.4

Pocket 1 FPocket #1
0.619
Show in viewer
Surrounding area
Pocket 2 FPocket #3
0.521
Likely same site as P2Rank 3 1.0 Å 13 shared residues 100% of smaller site
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Surrounding area
Pocket 3 FPocket #15
0.304
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Surrounding area
Pocket 4 FPocket #6
0.203
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Surrounding area
Residue sets
UniProt: Binding site:130-130
UniProt: Binding site:132-132
UniProt: Binding site:208-208
UniProt: Binding site:213-213
UniProt: Binding site:221-221
UniProt: Binding site:265-266
UniProt: Binding site:270-270
UniProt: Binding site:272-274
UniProt: Binding site:322-322
UniProt: Binding site:328-328
UniProt: Binding site:340-340
UniProt: Binding site:353-353
UniProt: Binding site:358-358
UniProt: Binding site:360-360
All structural evidence 0 experimental · 2 predicted

Structural evidence

0 + 2

Experimental PDB entries plus predicted AlphaFold DB or ColabFold models. Click Switch to display a different loaded structure in the viewer.

Entry Method Resolution Chain Coverage Links Status
AlphaFold DB AF_A0A0H3GG67
AlphaFold DB full sequence Viewing
ColabFold VK055_3295
ColabFold full sequence Loaded

Ligand evidence

Ligands grouped by evidence source. PDB ligands keep the source crystal visible, and loaded crystals can be opened directly in the structure viewer.

62 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 12 records from similar proteins
Structural ligands 10 0 loaded crystals
Measured bioactivity 2 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
1AZ PDB via homolog 424.3 Da · LogP 1.63 · TPSA 74.3 Open detail RCSB PDB
2K9 PDB via homolog Detail RCSB PDB
46B PDB via homolog Detail RCSB PDB
ANP PDB via homolog Detail RCSB PDB
IQ1 PDB via homolog Detail RCSB PDB

Structural evidence inferred from similar proteins. The source crystal indicates where the ligand was observed; the UniProt column identifies the homologous protein carrying that ligand.

Show only:
Ligand Source crystal UniProt (homolog) MW · LogP · TPSA Lipinski PAINS SMILES
1AZ RCSB PDB P9WN39 424.3 Da LogP 1.63 TPSA 74.3 ✓ Ro5 ✓ Clean Cn1c2c(nc1N3CCOCC3)N(C(=O)N(C2=O)Cc4ccc(c(c4)Cl…
2K9 RCSB PDB P9WN38 297.3 Da LogP 2.28 TPSA 47.3 ✓ Ro5 ✓ Clean c1ccc(cc1)c2cccc3c2C=C4C3=NC(=O)c5n4ccn5
46B RCSB PDB P9WN39 418.3 Da LogP 4.44 TPSA 75.9 ✓ Ro5 ✓ Clean CCCCNc1c(nc2n1cc(cc2)Br)c3ccc(cc3)OCC(=O)O
ANP RCSB PDB P77961 506.2 Da LogP -2.06 TPSA 281.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
IQ1 RCSB PDB P9WN39 328.4 Da LogP 4.98 TPSA 54.5 ✓ Ro5 ✓ Clean CC(C)(C)c1[nH]c(c(n1)c2cc3ccccc3nc2)c4ccncc4
MXI RCSB PDB P9WN39 372.5 Da LogP 5.18 TPSA 76.8 1 viol. ✓ Clean CC(C)(C)c1[nH]c(c(n1)c2ccc3cc(ccc3c2)OC)c4ccnc(…
P3P RCSB PDB P94845 261.1 Da LogP -0.19 TPSA 147.2 ✓ Ro5 ✓ Clean C[P@](=O)(CC[C@@H](C(=O)O)N)OP(=O)(O)O
P3S RCSB PDB P12425 260.2 Da LogP -1.02 TPSA 150.3 ✓ Ro5 ✓ Clean C[S@](=NP(=O)(O)O)(=O)CC[C@@H](C(=O)O)N
PPQ RCSB PDB P0A1P6 181.1 Da LogP -0.31 TPSA 100.6 ✓ Ro5 ✓ Clean C[P@](=O)(CC[C@@H](C(=O)O)N)O
TL RCSB PDB P0A1P6 204.4 Da LogP -0.38 TPSA 0.0 ✓ Ro5 ✓ Clean [Tl+]

PDB and ChEMBL records on this protein are shown in full. ChEMBL records from similar proteins are capped at the top 100 per protein (by pchembl) and ZINC at the top 50 (Tanimoto ≥ 0.5). ADME columns are descriptor-based screening flags, not experimental toxicity results.

Cross-references

External database identifiers for this protein, its structures, ligands, and metabolic reactions.