Protein target profile

KP13_04211

Seryl-tRNA synthetase

Genome: KpKP13 Gene: AHE45442.1 serS 3D evidence: Experimental + ColabFold model UniProt A6T6Z0|W9BNU9
Length 430
Pocket druggability 0.953
Direct ligand evidence 0 58 total records
Functional annotation 0 EC 6 GO
Target summary

Strong target candidate with converging metabolic, structural and chemical evidence.

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 (%)
35.013 Lower values reduce human off-target concern.
Human E-value
1.1699999999999999e-60
Gut microbiome similarity
28.4% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
94.419 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
97.08 0-100 confidence; >70 supports local structural interpretation.

Binding-site evidence

PDB experimental structure

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 0.953
Structure 7AP1
Pocket Pocket 3
P2Rank 0.794
Structure 7AP1
Pocket Pocket 1
ColabFold model
FPocket 0.384 · Pocket 3
P2Rank 0.876 · Pocket 1
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 1346 / 4744 genomes with a hit
Prevalence 28.4%

Cross-references

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

Sequence

Primary amino-acid sequence viewer.

MLDPNLLRTEPDAVAEKLARRGFKLDVDKLRALEERRKVLQVQTENLQAERNSRSKSIGQAKARGEDIEPLRLEVNKLGEQLDAAKSELETLLAEIRDIALAIPNIPHDDVPVGRDENDNVEVSRWGTPRQFDFEVRDHVTLGEMHGGLDFAAAVKLTGSRFVVMKGQLARLHRALAQFMLDLHTEQHGYSENYVPYLVNQDTLYGTGQLPKFAGDLFHTRPLEEEADSSNYALIPTAEVPLTNLVRDEIIDEDDLPIKMTAHTPCFRSEAGSYGRDTRGLIRMHQFDKVEMVQIVRPEDSMAALEEMTGHAEKVLQLLGLPYRKVALCTGDMGFSACKTYDLEVWVPAQNTYREISSCSNVWDFQARRMQARCRSKSDKKTRLVHTLNGSGLAVGRTLVALMENYQQADGRIEIPEVLRPYMRGLEYIG

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

6 GO

Gene Ontology (GO)

6
  • 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.
  • GO:0005524 Binding to ATP, adenosine 5'-triphosphate, a universally important coenzyme and enzyme regulator.
  • GO:0006434 The process of coupling serine to seryl-tRNA, catalyzed by seryl-tRNA synthetase. The seryl-tRNA synthetase is a class-II synthetase. The activated amino acid is transferred to the 3'-OH group of a serine-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:0004828 Catalysis of the reaction: ATP + L-serine + tRNA(Ser) = AMP + diphosphate + L-seryl-tRNA(Ser). Also catalyzes the formation of L-seryl-tRNA(Sec) from tRNA(Sec), the special tRNA for selenocysteine.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

37 records
Show feature table
Start End DB Term Name
1 423 NCBIfam TIGR00414 serine--tRNA ligase
1 423 InterPro IPR002317 Serine-tRNA ligase, type1
119 423 CDD cd00770 SerRS_core
119 423 InterPro IPR033729 Serine-tRNA ligase catalytic core domain
228 406 Pfam PF00587 tRNA synthetase class II core domain (G, H, P, S and T)
228 406 InterPro IPR002314 Aminoacyl-tRNA synthetase, class II (G/ P/ S/T)
1 112 SUPERFAMILY SSF46589 tRNA-binding arm
1 112 InterPro IPR010978 Class I and II aminoacyl-tRNA synthetase, tRNA-binding arm
1 430 PIRSF PIRSF001529 Ser-tRNA_ligase
1 430 InterPro IPR002317 Serine-tRNA ligase, type1
1 104 FunFam G3DSA:1.10.287.40:FF:000001 Serine--tRNA ligase
68 102 Coils Coil Coil
282 295 PRINTS PR00981 Seryl-tRNA synthetase signature
282 295 InterPro IPR002317 Serine-tRNA ligase, type1
322 335 PRINTS PR00981 Seryl-tRNA synthetase signature
322 335 InterPro IPR002317 Serine-tRNA ligase, type1
270 282 PRINTS PR00981 Seryl-tRNA synthetase signature
270 282 InterPro IPR002317 Serine-tRNA ligase, type1
339 355 PRINTS PR00981 Seryl-tRNA synthetase signature
339 355 InterPro IPR002317 Serine-tRNA ligase, type1
357 373 PRINTS PR00981 Seryl-tRNA synthetase signature
357 373 InterPro IPR002317 Serine-tRNA ligase, type1
30 50 Coils Coil Coil
1 429 PANTHER PTHR43697 SERYL-TRNA SYNTHETASE
1 107 Pfam PF02403 Seryl-tRNA synthetase N-terminal domain
1 107 InterPro IPR015866 Serine-tRNA synthetase, type1, N-terminal
116 424 SUPERFAMILY SSF55681 Class II aaRS and biotin synthetases
116 424 InterPro IPR045864 Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL)
1 104 Gene3D G3DSA:1.10.287.40 -
1 104 InterPro IPR042103 Serine-tRNA synthetase, type1, N-terminal domain superfamily
105 430 FunFam G3DSA:3.30.930.10:FF:000018 Serine--tRNA ligase
105 430 Gene3D G3DSA:3.30.930.10 Bira Bifunctional Protein; Domain 2
105 430 InterPro IPR045864 Class II Aminoacyl-tRNA synthetase/Biotinyl protein ligase (BPL) and lipoyl protein ligase (LPL)
1 428 Hamap MF_00176 Serine--tRNA ligase [serS].
1 428 InterPro IPR002317 Serine-tRNA ligase, type1
171 416 ProSiteProfiles PS50862 Aminoacyl-transfer RNA synthetases class-II family profile.
171 416 InterPro IPR006195 Aminoacyl-tRNA synthetase, class II

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
0.953
Likely same site as P2Rank 4 1.6 Å 11 shared residues 92% of smaller site
Unusual size
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Surrounding area
Site 2 FPocket #1
0.311
Likely same site as P2Rank 1 7.9 Å 15 shared residues 62% of smaller site
Unusual size
Show in viewer
Surrounding area

Binding pockets · P2Rank

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

Site 1 P2Rank #1
0.794
Likely same site as FPocket 1 7.9 Å 15 shared residues 62% of smaller site
Show in viewer
Surrounding area
Site 2 P2Rank #2
0.185
Show in viewer
Surrounding area
Site 3 P2Rank #3
0.151
Show in viewer
Surrounding area
Site 4 P2Rank #4
0.048
Likely same site as FPocket 3 1.6 Å 11 shared residues 92% of smaller site
Show in viewer
Surrounding area
Site 5 P2Rank #5
0.034
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Surrounding area
All structural evidence 6 experimental · 1 predicted

Structural evidence

6 + 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
PDB 6H9X
X-ray A Loaded
PDB 6HHY
X-ray A Loaded
PDB 6HHZ
X-ray A Loaded
PDB 6HI0
X-ray A Loaded
PDB 6S30
X-ray A Loaded
PDB 7AP1
X-ray A Viewing
ColabFold KP13_04211
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.

58 records
Chemistry signal

Structural and bioactivity evidence are both available for this target.

Direct evidence 0 same-protein records
Transferred evidence 8 records from similar proteins
Structural ligands 4 3 loaded crystals
Measured bioactivity 4 direct and transferred ChEMBL records
Proposed compounds 50 similarity-based ZINC candidates
Best available ligand signal
FZK PDB via homolog 410.4 Da · LogP -5.15 · TPSA 223.3 Open detail RCSB PDB
FZQ PDB via homolog Detail RCSB PDB
FZT PDB via homolog Detail RCSB PDB
JPE PDB via homolog Detail RCSB PDB
SSA ChEMBL via homolog · pchembl 9.74 (~0.2 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
FZK RCSB PDB A6T6Z0 410.4 Da LogP -5.15 TPSA 223.3 2 viol. ✓ Clean C1=CN(C(=O)NC1=O)[C@H]2[C@@H]([C@@H]([C@H](O2)C…
FZQ RCSB PDB A6T6Z0 409.4 Da LogP -4.86 TPSA 229.3 2 viol. ✓ Clean C1=CN(C(=O)N=C1N)[C@H]2[C@@H]([C@@H]([C@H](O2)C…
FZT RCSB PDB A6T6Z0 424.4 Da LogP -5.14 TPSA 212.4 1 viol. ✓ Clean CN1C(=O)C=CN(C1=O)[C@H]2[C@@H]([C@@H]([C@H](O2)…
JPE RCSB PDB P0A8L1 510.5 Da LogP -3.21 TPSA 250.9 3 viol. ✓ Clean c1cc(cnc1)c2nc(c3c(n2)n(cn3)[C@H]4[C@@H]([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.