Protein target profile

PA3700

lysine--tRNA ligase

Genome: NC_002516.2

Gene: lysS PA3700 3D evidence: AlphaFold DB model UniProt Q9HXU0
Length 501
Pocket druggability 0.729
Ligand records 69
EC / GO 1 / 12
Target summary

Target candidate with partial support; inspect missing evidence before prioritizing.

4 signals
How to read 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 TPW 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.

Overview

Basic information about this protein and its source genome.

Accession
PA3700
Gene
lysS PA3700
Status
annotated
Amino acids
501
3D evidence
AlphaFold DB model

Target profile

Computed evidence for target prioritization.

Human off-target
hit
Human identity (%)
48.864
Human E-value
5.860000000000001e-21
Gut microbiome off-target
hit
Essential (DEG)
Y
Localization
Cytoplasmic

Selected pocket evidence

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 0.729
Structure
Pocket

Sequence

Primary amino-acid sequence viewer.

MSDQQLDQHELQQEENKLIAQRKEKLAAVREARAIAFPNDFRRDAYFADLQKQYADKTKEELEAAAIPVKVAGRIMLNRGSFIVLQDSSERLQVYVNRKTLPEETLAEIKTWDLGDIIGAEGVLARSGKGDLYVDMTSVRLLTKSLRPLPDKHHGLTDTEQRYRQRYVDLMVNEETRHTFRVRSQVIAHIRRFLSERGFLEVETPMLQTIPGGAAAKPFETHHNALDMAMFLRIAPELYLKRLVVGGFEKVFEINRNFRNEGVSTRHNPEFTMLEFYQAYADYEDNMDLTEELFRELAQSVLGTTDVPYGDKVFHFGEPFVRLSVFDSILKYNPEITAADLNDVEKARAIAKKAGAKVLGHEGLGKLQVMIFEELVEHKLEQPHFITRYPFEVSPLARRNDEDPSVTDRFELFIGGREIANAYSELNDAEDQAERFMLQVKEKDAGDDEAMHYDADFINALEYGMPPTAGEGIGIDRLVMLLTNSPSIRDVILFPHMRPQA

Functional Annotations

Enzyme classification and Gene Ontology terms linked to this protein.

1 EC 12 GO

Enzyme Commission (EC)

1

Gene Ontology (GO)

12
  • GO:0005737 The contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
  • GO:0005829 The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0004824 Catalysis of the reaction: ATP + L-lysine + tRNA(Lys) = AMP + diphosphate + L-lysyl-tRNA(Lys).
  • GO:0000287 Binding to a magnesium (Mg) ion.
  • GO:0042803 Binding to an identical protein to form a homodimer.
  • GO:0000049 Binding to a transfer RNA.
  • GO:0006430 The process of coupling lysine to lysyl-tRNA, catalyzed by lysyl-tRNA synthetase. The lysyl-tRNA synthetase is a class-II synthetase. The activated amino acid is transferred to the 3'-OH group of a lysine-accetping tRNA.
  • 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:0003676 Binding to a nucleic acid.
  • GO:0004812 Catalysis of the formation of aminoacyl-tRNA from ATP, amino acid, and tRNA with the release of diphosphate and AMP.
  • 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.

Sequence Features

Domain/signature hits from InterPro and related databases.

38 records
Show feature table
Start End DB Term Name
154 501 Gene3D G3DSA:3.30.930.10 Bira Bifunctional Protein; Domain 2
154 501 InterPro IPR045864 Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL)
180 499 ProSiteProfiles PS50862 Aminoacyl-transfer RNA synthetases class-II family profile.
180 499 InterPro IPR006195 Aminoacyl-tRNA synthetase, class II
69 142 Pfam PF01336 OB-fold nucleic acid binding domain
69 142 InterPro IPR004365 OB-fold nucleic acid binding domain, AA-tRNA synthetase-type
173 499 CDD cd00775 LysRS_core
173 499 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
8 500 PANTHER PTHR42918 LYSYL-TRNA SYNTHETASE
15 151 FunFam G3DSA:2.40.50.140:FF:000024 Lysine--tRNA ligase
419 439 Coils Coil Coil
21 500 Hamap MF_00252 Lysine--tRNA ligase [lysS].
21 500 InterPro IPR002313 Lysine-tRNA ligase, class II
13 151 SUPERFAMILY SSF50249 Nucleic acid-binding proteins
13 151 InterPro IPR012340 Nucleic acid-binding, OB-fold
69 170 CDD cd04322 LysRS_N
69 170 InterPro IPR044136 Lysine-tRNA ligase, class II, N-terminal
280 300 Coils Coil Coil
159 497 Pfam PF00152 tRNA synthetases class II (D, K and N)
159 497 InterPro IPR004364 Aminoacyl-tRNA synthetase, class II (D/K/N)
15 151 Gene3D G3DSA:2.40.50.140 -
15 151 InterPro IPR012340 Nucleic acid-binding, OB-fold
258 275 PRINTS PR00982 Lysyl-tRNA synthetase signature
258 275 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
240 253 PRINTS PR00982 Lysyl-tRNA synthetase signature
240 253 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
211 227 PRINTS PR00982 Lysyl-tRNA synthetase signature
211 227 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
195 205 PRINTS PR00982 Lysyl-tRNA synthetase signature
195 205 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
382 398 PRINTS PR00982 Lysyl-tRNA synthetase signature
382 398 InterPro IPR018149 Lysyl-tRNA synthetase, class II, C-terminal
11 31 Coils Coil Coil
158 498 SUPERFAMILY SSF55681 Class II aaRS and biotin synthetases
158 498 InterPro IPR045864 Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL)
16 500 NCBIfam TIGR00499 lysine--tRNA ligase
16 500 InterPro IPR002313 Lysine-tRNA ligase, class II
152 497 FunFam G3DSA:3.30.930.10:FF:000001 Lysine--tRNA ligase

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.

3D visualization script Full viewer

Loading 3D structure...

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Structural evidence

0 + 1

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 PA3700
AlphaFold DB full sequence Viewing
Pocket details FPocket · P2Rank — toggle visibility and zoom from here, or open full viewer

Pockets (FPOCKET)

Showing top-ranked FPocket candidates by druggability. Druggability is color-coded: high (0.7 or higher), medium (0.4 to 0.69), low (below 0.4).

FPOCKET Sticks Spheres Surfaces Druggability Labels Zoom Positions
2 0.729
1 0.29
6 0.286
3 0.208

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.

69 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 69 via homologs
Structural ligands 17 0 loaded crystals
Bioactive compounds 2 50 ZINC proposed compounds
Drug-like & clean 37 0 PAINS alerts
Best available ligand signal
45A PDB via homolog 345.3 Da · LogP -1.14 · TPSA 165.8 Open detail RCSB PDB
Detail RCSB PDB 45A PDB via homolog
Detail RCSB PDB 9X0 PDB via homolog
Detail RCSB PDB ACP PDB via homolog
Detail RCSB PDB APC PDB via homolog

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
45A RCSB PDB Q15046 345.3 Da LogP -1.14 TPSA 165.8 ✓ Ro5 ✓ Clean CP(=O)(O)OC[C@@H]1[C@H]([C@H]([C@@H](O1)n2cnc3c…
9X0 RCSB PDB Q8IDJ8 285.3 Da LogP 3.10 TPSA 59.3 ✓ Ro5 ✓ Clean c1ccc2c(c1)C(=O)C=C(O2)C(=O)NCC3CCCCC3
ACP RCSB PDB P0A8N5 505.2 Da LogP -1.52 TPSA 269.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
APC RCSB PDB Q15046 505.2 Da LogP -1.52 TPSA 269.9 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
B4P RCSB PDB Q9RHV9 836.4 Da LogP -2.45 TPSA 434.0 3 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
D4O RCSB PDB W7JP72 290.4 Da LogP 3.40 TPSA 66.8 ✓ Ro5 ✓ Clean C[C@H]1CCC[C@@H](C1)C[C@H]2Cc3cc(cc(c3C(=O)O2)O…
D4U RCSB PDB W7JP72 276.3 Da LogP 3.15 TPSA 66.8 ✓ Ro5 ✓ Clean c1c(cc(c2c1C[C@@H](OC2=O)CC3CCCCC3)O)O
D4X RCSB PDB W7JP72 289.4 Da LogP 2.97 TPSA 69.6 ✓ Ro5 ✓ Clean C[C@H]1CCC[C@@H](C1)C[C@H]2Cc3cc(cc(c3C(=O)N2)O…
D5F RCSB PDB W7JP72 288.3 Da LogP 3.57 TPSA 70.7 ✓ Ro5 ✓ Clean C[C@H]1CCC[C@@H](C1)CC2=Cc3cc(cc(c3C(=O)O2)O)O
D5O RCSB PDB W7JP72 274.3 Da LogP 3.33 TPSA 70.7 ✓ Ro5 ✓ Clean c1c(cc(c2c1C=C(OC2=O)CC3CCCCC3)O)O
EZ3 RCSB PDB Q8IDJ8 308.3 Da LogP 1.50 TPSA 96.2 ✓ Ro5 ✓ Clean C[C@H]1CCC[C@@H](O1)[C@H]([C@H]2Cc3cc(cc(c3C(=O…
F6O RCSB PDB Q8IDJ8 580.8 Da LogP 3.77 TPSA 115.8 2 viol. ✓ Clean CC(C)S(=O)(=O)c1ccccc1Nc2ncnc(n2)Nc3ccc(cc3OC)N…
FYB RCSB PDB Q8IDJ8 355.3 Da LogP 2.60 TPSA 79.5 ✓ Ro5 ✓ Clean c1cc2c(cc1F)C(=O)C=C(O2)C(=O)NCC3(CCC(CC3)(F)F)O
KAA RCSB PDB Q9RHV9 474.5 Da LogP -3.14 TPSA 243.8 2 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…
KRS RCSB PDB Q8IDJ8 292.3 Da LogP 2.53 TPSA 76.0 ✓ Ro5 ✓ Clean C[C@H]1CCC[C@@H](O1)C[C@H]2Cc3cc(cc(c3C(=O)O2)O…
LYN RCSB PDB Q9RHV9 146.2 Da LogP -1.79 TPSA 96.8 ✓ Ro5 ✓ Clean C(CC[NH3+])C[C@@H](C(=O)N)N
XAH RCSB PDB Q9RHV9 490.4 Da LogP -2.35 TPSA 256.2 2 viol. ✓ Clean c1nc(c2c(n1)n(cn2)[C@H]3[C@@H]([C@@H]([C@H](O3)…

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.