Protein target profile

HT085_RS00355

isoleucine--tRNA ligase

Genome: NZ_AP023069.1 Gene: ileS TUM19854C_00590 3D evidence: ColabFold model
Length 929
Direct ligand evidence 0 85 total records
Functional annotation 0 EC 2 GO
Target summary

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

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
Gut microbiome off-target
Hit

Essentiality

Essential (DEG)
Y

Localization

Localization
Cytoplasmic

Binding-site 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 Low
Structure
Pocket

Sequence

Primary amino-acid sequence viewer.

MTDYSKTVNLLESPFPMRGNLAKCEPAWLKSWYEQKRYQKLREIAKGRPKFILHDGPPYANGDIHIGHAVNKILKDIIIRSKTQAGFDAPYVPGWDCHGLPIEVMVEKLHGKDMPKARFRELCREYAAEQIARQKKDFIRLGVLGDWDNPYLTMDFKTEADTVRMLGEIYKSGYLYRGAKPVQFCLDCGSSLAEAEVEYKDKVSPAIDVAYPFKDTVALAAAFGLAGIEGKAFAVIWTTTPWTLPASQAVSAGADVVYQLIDTPKGKLVLAKDLAEGALKRYGFSDGIAILAETTGDKLENLHMNHPFLERDIPMLNGEHVTTDAGTGLVHTAPAHGLEDYAVCNKYGIELYNPVNAEGKYISETPRVAGMSVWEANPVILQWPEETGNLLASSKIEHSYAHCWRHKTPLIYRATGQWFVGMDKAGSDGKTLRDKAIKAVDDTEFFPPWGRARLESMIEGRPDWVVSRQRYWGTPMTFFVHKETGELHPNSAELLEKVAQRIEEKGIEAWFSLDKSELLSAEDCEHYDKLPDTMDVWFDSGSTHYSVVKQREELEWPADLYLEGSDQHRGWFQSSMLTGCASSMGRAPYKQLLTHGFVVDQNGRKMSKSIGNVVAPQEVYNEFGADILRLWAASTDYSGELAISKEILKRVTESYRRIRNTLSFLFANLSDFNPIEDAVQQADMVEIDRYALVLARRLQERLAGGYYPRYAFHFAVKDIVSFCSEDLGAFYLDILKDRLYTTKADSRARRSAQTALYHITRSLVLLIAPILCFTGEEAWDIIGGGEEDSVLFHTWHEFPAINEKAEAELVKKWTAIREAREAVTAAIEPLRADKTVGSSLQAEAEITAPEEMAGYLNALGEELRFALLVSKAEVKVGDELAVAAKAGDGEKCERCWHYTRDVGAVAGYETVCKRCAENVGGEGETRHYA

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

2 GO

Gene Ontology (GO)

2
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0002161 The hydrolysis of an incorrectly aminoacylated tRNA.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

40 records
Show feature table
Start End DB Term Name
219 378 FunFam G3DSA:3.90.740.10:FF:000022 Isoleucine--tRNA ligase
889 917 Pfam PF06827 Zinc finger found in FPG and IleRS
889 917 InterPro IPR010663 Zinc finger, FPG/IleRS-type
563 572 PRINTS PR00984 Isoleucyl-tRNA synthetase signature
563 572 InterPro IPR002301 Isoleucine-tRNA ligase
51 62 PRINTS PR00984 Isoleucyl-tRNA synthetase signature
51 62 InterPro IPR002301 Isoleucine-tRNA ligase
529 542 PRINTS PR00984 Isoleucyl-tRNA synthetase signature
529 542 InterPro IPR002301 Isoleucine-tRNA ligase
235 258 PRINTS PR00984 Isoleucyl-tRNA synthetase signature
235 258 InterPro IPR002301 Isoleucine-tRNA ligase
398 413 PRINTS PR00984 Isoleucyl-tRNA synthetase signature
398 413 InterPro IPR002301 Isoleucine-tRNA ligase
58 69 ProSitePatterns PS00178 Aminoacyl-transfer RNA synthetases class-I signature.
58 69 InterPro IPR001412 Aminoacyl-tRNA synthetase, class I, conserved site
643 824 CDD cd07960 Anticodon_Ia_Ile_BEm
643 824 InterPro IPR033708 Isoleucyl tRNA synthetase type 1, anticodon-binding domain
375 640 Gene3D G3DSA:3.40.50.620 HUPs
375 640 InterPro IPR014729 Rossmann-like alpha/beta/alpha sandwich fold
18 211 FunFam G3DSA:3.40.50.620:FF:000042 Isoleucine--tRNA ligase
3 651 SUPERFAMILY SSF52374 Nucleotidylyl transferase
376 641 FunFam G3DSA:3.40.50.620:FF:000048 Isoleucine--tRNA ligase
28 643 Pfam PF00133 tRNA synthetases class I (I, L, M and V)
28 643 InterPro IPR002300 Aminoacyl-tRNA synthetase, class Ia
15 846 NCBIfam TIGR00392 isoleucine--tRNA ligase
15 846 InterPro IPR002301 Isoleucine-tRNA ligase
218 374 Gene3D G3DSA:3.90.740.10 -
218 374 InterPro IPR009008 Valyl/Leucyl/Isoleucyl-tRNA synthetase, editing domain
3 924 PANTHER PTHR42765 SOLEUCYL-TRNA SYNTHETASE
643 920 Gene3D G3DSA:1.10.730.20 -
655 920 SUPERFAMILY SSF47323 Anticodon-binding domain of a subclass of class I aminoacyl-tRNA synthetases
655 920 InterPro IPR009080 Aminoacyl-tRNA synthetase, class Ia, anticodon-binding
200 400 SUPERFAMILY SSF50677 ValRS/IleRS/LeuRS editing domain
200 400 InterPro IPR009008 Valyl/Leucyl/Isoleucyl-tRNA synthetase, editing domain
2 920 Hamap MF_02002 Isoleucine--tRNA ligase [ileS].
2 920 InterPro IPR023585 Isoleucine-tRNA ligase, type 1
19 217 Gene3D G3DSA:3.40.50.620 HUPs
19 217 InterPro IPR014729 Rossmann-like alpha/beta/alpha sandwich fold
706 845 Pfam PF08264 Anticodon-binding domain of tRNA ligase
706 845 InterPro IPR013155 Methionyl/Valyl/Leucyl/Isoleucyl-tRNA synthetase, anticodon-binding

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 · FPocket

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

Site 1 FPocket #3
0.422
Show in viewer
Surrounding area
Site 2 FPocket #4
0.331
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Surrounding area
Site 3 FPocket #1
0.303
Show in viewer
Surrounding area
All structural evidence 0 experimental · 1 predicted

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
ColabFold HT085_RS00355
ColabFold full sequence Viewing

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.

85 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 35 records from similar proteins
Structural ligands 1 0 loaded crystals
Measured bioactivity 34 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
ILA PDB via homolog 458.5 Da · LogP -2.65 · TPSA 220.6 Open detail RCSB PDB
MRC ChEMBL via homolog · pchembl 9.10 (~0.8 nM) Detail ChEMBL
CHEMBL4553017 ChEMBL via homolog · pchembl 8.92 (~1.2 nM) Detail ChEMBL
CHEMBL1163069 ChEMBL via homolog · pchembl 8.72 (~1.9 nM) Detail ChEMBL
CHEMBL605376 ChEMBL via homolog · pchembl 7.85 (~14.1 nM) Detail ChEMBL

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
ILA RCSB PDB P56690 458.5 Da LogP -2.65 TPSA 220.6 2 viol. ✓ Clean CC[C@H](C)[C@@H](C(=O)NS(=O)(=O)NC[C@@H]1[C@H](…

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.