Protein target profile

VK055_0059

arginine--tRNA ligase

Genome: KpATCC43816 Gene: AIK78687.1 argS 3D evidence: Experimental + AlphaFold DB model + ColabFold model Metabolism 2 reactions UniProt A6TB43
Length 577
Pocket druggability 0.198
Metabolic reactions 2
Chokepoint Yes
Direct ligand evidence 0 54 total records
Functional annotation 0 EC 7 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 (%)
63.333 Lower values reduce human off-target concern.
Human E-value
3.06e-18
Gut microbiome similarity
3.8% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

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

Localization

Localization
Cytoplasmic

Structure confidence

ColabFold pLDDT
94.24 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

AlphaFold DB / UniProt model

The selected pocket score is the FPocket value used for ranking after applying the curated structure priority. It estimates small-molecule pocket quality; it is not experimental binding evidence. The 3D viewer may show a different loaded structure, so visible pockets can differ.

FPocket 0.198
Structure A6TB43
Pocket Pocket 9
P2Rank 0.766
Structure A6TB43
Pocket Pocket 1
ColabFold model
FPocket 0.08 · Pocket 2
P2Rank 0.772 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 178 / 4744 genomes with a hit
Prevalence 3.8%

Cross-references

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

Structure

Metabolic context

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

Explore metabolic network

Attractive metabolic target: catalyzes a producing chokepoint reaction in Aminoacyl-tRNA biosynthesis, no isoenzyme backup detected.

Relative network centrality 0.0% more central than 0.0% of genes in this genome
Chokepoint Chokepoint gene
Catalyzed reactions

2 reactions 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.

MNIQALLSEKVSQALIAAGAPADCEPQVRQSAKVQFGDYQANGVMAVAKKLGMAPRQLAEQVLSHLDLNGIANKVEIAGPGFINIFLDPAFLADNVNRALQSERLGVTKPQAQTIVVDYSAPNVAKEMHVGHLRSTIIGDASVRTLEFLGHKVIRANHVGDWGTQFGMLIAYLEKQQQENAGEMALADLEGFYREAKKHYDEDEAFAERARSYVVKLQGGDEYFLQMWRKLVDITMSQNQITYDRLNVTLTRDDVMGESLYNPMLPGIVADLKAKGLAVESEGATVVFLDEYKNKEGEPMGVIIQKKDGGYLYTTTDIACAKYRYETLHADRVLYYIDSRQHQHLMQAWTIVRKAGYVPDSVPLEHHMFGMMLGKDGKPFKTRAGGTVKLADLLDEALERARRLVAEKNPDMSADELENLAKVVGIGAVKYADLSKNRTTDYVFDWDNMLAFEGNTAPYMQYAYTRVLSVFRKAGIDENAMIDAPVVIAEDREAQLAARLLQFEETLSVVAREGTPHVMCAYLYDLAGLFSGFYEHCPILSAESEETRNSRLKLALLTAKTLKLGLDTLGIETVERM

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

7 GO

Gene Ontology (GO)

7
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0004812 Catalysis of the formation of aminoacyl-tRNA from ATP, amino acid, and tRNA with the release of diphosphate and AMP.
  • GO:0000166 Binding to a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
  • GO:0006418 The synthesis of aminoacyl tRNA by the formation of an ester bond between the 3'-hydroxyl group of the most 3' adenosine of the tRNA and the alpha carboxylic acid group of an amino acid, to be used in ribosome-mediated polypeptide synthesis.
  • GO:0006420 The process of coupling arginine to arginyl-tRNA, catalyzed by arginyl-tRNA synthetase. The arginyl-tRNA synthetase is a class-I synthetase. The activated amino acid is transferred to the 2'-OH group of an alanine accetping tRNA. The 2'-O-aminoacyl-tRNA will ultimately migrate to the 3' position via transesterification.
  • GO:0004814 Catalysis of the reaction: ATP + L-arginine + tRNA(Arg) = AMP + diphosphate + L-arginyl-tRNA(Arg).
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

41 records
Show feature table
Start End DB Term Name
1 106 FunFam G3DSA:3.30.1360.70:FF:000001 Arginine--tRNA ligase
110 453 Gene3D G3DSA:3.40.50.620 HUPs
110 453 InterPro IPR014729 Rossmann-like alpha/beta/alpha sandwich fold
454 577 SUPERFAMILY SSF47323 Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases
454 577 InterPro IPR009080 Aminoacyl-tRNA synthetase, class Ia, anticodon-binding
1 101 SUPERFAMILY SSF55190 Arginyl-tRNA synthetase (ArgRS), N-terminal 'additional' domain
1 101 InterPro IPR036695 Arginyl tRNA synthetase N-terminal domain superfamily
460 577 Pfam PF05746 DALR anticodon binding domain
460 577 InterPro IPR008909 DALR anticodon binding
5 577 Hamap MF_00123 Arginine--tRNA ligase [argS].
5 577 InterPro IPR001278 Arginine-tRNA ligase
454 577 FunFam G3DSA:1.10.730.10:FF:000001 Arginine--tRNA ligase
109 454 SUPERFAMILY SSF52374 Nucleotidylyl transferase
114 385 CDD cd00671 ArgRS_core
114 385 InterPro IPR035684 Arginyl-tRNA synthetase, catalytic core domain
122 133 ProSitePatterns PS00178 Aminoacyl-transfer RNA synthetases class-I signature.
122 133 InterPro IPR001412 Aminoacyl-tRNA synthetase, class I, conserved site
3 577 NCBIfam TIGR00456 arginine--tRNA ligase
3 577 InterPro IPR001278 Arginine-tRNA ligase
96 446 Pfam PF00750 tRNA synthetases class I (R)
96 446 InterPro IPR035684 Arginyl-tRNA synthetase, catalytic core domain
422 577 CDD cd07956 Anticodon_Ia_Arg
1 106 Gene3D G3DSA:3.30.1360.70 -
1 106 InterPro IPR036695 Arginyl tRNA synthetase N-terminal domain superfamily
4 577 PANTHER PTHR11956 ARGINYL-TRNA SYNTHETASE
4 577 InterPro IPR001278 Arginine-tRNA ligase
7 87 Pfam PF03485 Arginyl tRNA synthetase N terminal domain
7 87 InterPro IPR005148 Arginyl tRNA synthetase N-terminal domain
454 577 Gene3D G3DSA:1.10.730.10 -
153 166 PRINTS PR01038 Arginyl-tRNA synthetase signature
153 166 InterPro IPR001278 Arginine-tRNA ligase
129 145 PRINTS PR01038 Arginyl-tRNA synthetase signature
129 145 InterPro IPR001278 Arginine-tRNA ligase
114 129 PRINTS PR01038 Arginyl-tRNA synthetase signature
114 129 InterPro IPR001278 Arginine-tRNA ligase
303 324 PRINTS PR01038 Arginyl-tRNA synthetase signature
303 324 InterPro IPR001278 Arginine-tRNA ligase
460 577 SMART SM00836 dalr_1_4
109 453 FunFam G3DSA:3.40.50.620:FF:000030 Arginine--tRNA ligase
1 87 SMART SM01016 Arg_tRNA_synt_N_2
1 87 InterPro IPR005148 Arginyl tRNA synthetase N-terminal domain

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

Probability: high ≥ 0.5 · medium 0.2–0.49 · low < 0.2

Site 1 P2Rank #4
0.039
Show in viewer
Surrounding area
All structural evidence 1 experimental · 2 predicted

Structural evidence

1 + 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
PDB 3GDZ
X-ray A Viewing
AlphaFold DB AF_A6TB43
AlphaFold DB full sequence Loaded
ColabFold VK055_0059
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.

54 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 4 records from similar proteins
Structural ligands 2 0 loaded crystals
Measured bioactivity 2 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
ANP PDB via homolog 506.2 Da · LogP -2.06 · TPSA 281.9 Open detail RCSB PDB
GGB PDB via homolog Detail RCSB PDB
CHEMBL1160244 ChEMBL via homolog · pchembl 8.35 (~4.5 nM) Detail ChEMBL
CHEMBL434782 ChEMBL via homolog · pchembl 8.12 (~7.6 nM) Detail ChEMBL
ZINC12360002 ZINC proposed compound · Tanimoto 0.810 Detail ZINC

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
ANP RCSB PDB O59147 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)…
GGB RCSB PDB P54136 176.2 Da LogP -1.80 TPSA 134.5 ✓ Ro5 ✓ Clean [H]/N=C(\N)/NOCC[C@@H](C(=O)O)N

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.