KpKP13 Protein target profile

AI-2 transport protein tqsA

Accession: KP13_01173

Gene: AHE44756.1 tqsA 3D evidence: AlphaFold DB model + ColabFold model UniProt A0A0H3GT09
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Length 344
Pocket druggability (P2Rank · AlphaFold DB model) 0.693
Functional annotation 0 EC 2 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.

Main supporting evidence

No similar human protein detected The current BLAST sequence screen did not find a significant human match, lowering apparent off-target risk. Core gene across strains Marked as conserved by both pan-genome tools: Roary and CoreCruncher. Moderate predicted binding pocket FPocket selected-pocket score 0.46. This supports review but is not experimental validation. Second pocket predictor agrees P2Rank predicted binding-site probability 0.69. Review the complete evidence below

Risks to review

Microbiome similarity 73 of 4744 screened genomes (1.5%) have a significant similarity hit. This target also has a predicted binding pocket (P2Rank 0.69) — check the ligand evidence before deprioritizing on off-target risk alone.

Evidence gaps

No metabolic context No SBML/network-derived reaction evidence is loaded for this protein. No ligand evidence No experimental PDB ligands, measured ChEMBL bioactivity, or proposed ZINC compound records are available.
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
No hit
Gut microbiome similarity
1.5% of screened genomes Lower prevalence suggests narrower overlap with the screened gut microbiome.

Essentiality

Essential (DEG)
Y
DEG identity (%)
41.691 Higher values support similarity to known essential genes.
DEG E-value
5.88e-78 Smaller values mean stronger essential-gene similarity.

Structure confidence

ColabFold pLDDT
86.59 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) 0.693
Structure A0A0H3GT09
Pocket Pocket 1
Druggability (FPocket) 0.455
Structure A0A0H3GT09
Pocket Pocket 20
ColabFold model
P2Rank 0.407 · Pocket 1
FPocket 0.958 · Pocket 28
Core conservation Conserved core gene
Roary core
CoreCruncher core
Gut microbiome 73 / 4744 genomes with a hit
Prevalence 1.5%

Sequence

Primary amino-acid sequence viewer.

MAKPIITLNGLKMVIMLGMLVIILTGIRFAADIIVPFILALFLAVIINPLVQLLVRCRVPRVLAISLLIGLIVMLAIVLLASLGTSLNELARTLPQYRNYLYEPMQTIAPWLQRMGFTVSVVELNKYIDPNAVMTLVTSLLTQLSNAMSSIFLLLLTVVFMLLEVPQLPAKLQQLMSRPVEGMGAIQRAIDSVSHYLVLKTAISLITGLVVWGMLVLLDVRFAFMWGLLAFALNYIPNIGSVLAAIPPILQVLVFGGLYEALVVLAGYLIVNLVFGNILEPRIMGRGLGLSTLVVFLSLIFWGWLLGPVGMLLSVPLTIIVKIALEQTSGGQSIAFLLSDVSKQ

Functional annotations

Enzyme classification and Gene Ontology terms linked to this protein.

2 GO

Subcellular localization

Localization
CytoplasmicMembrane

Gene Ontology (GO)

2
  • GO:0016020 A lipid bilayer along with all the proteins and protein complexes embedded in it and attached to it.
  • GO:0055085 The process in which a solute is transported across a lipid bilayer, from one side of a membrane to the other.

Sequence domains and features

Domain and signature matches imported from InterPro and related databases.

29 records
Show feature table
Start End DB Term Name
280 298 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
56 61 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
164 196 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
141 163 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
62 83 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
197 218 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
7 29 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
196 218 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
247 257 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
252 274 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
14 328 Pfam PF01594 AI-2E family transporter
14 328 InterPro IPR002549 Transmembrane protein TqsA-like
224 246 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
299 325 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
84 143 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
326 344 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
223 245 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
120 326 PANTHER PTHR21716 TRANSMEMBRANE PROTEIN
120 326 InterPro IPR002549 Transmembrane protein TqsA-like
28 32 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
33 55 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
294 316 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
62 84 TMHMM TMhelix Region of a membrane-bound protein predicted to be embedded in the membrane.
1 6 Phobius CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the cytoplasm.
258 279 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
7 27 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
219 223 Phobius NON_CYTOPLASMIC_DOMAIN Region of a membrane-bound protein predicted to be outside the membrane, in the extracellular region.
33 55 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.
144 163 Phobius TRANSMEMBRANE Region of a membrane-bound protein predicted to be embedded in the membrane.

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
0.693
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Surrounding area
Pocket 2 P2Rank #2
0.436
Likely same site as FPocket 24 2.5 Å 15 shared residues 100% of smaller site
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Surrounding area
Pocket 3 P2Rank #3
0.385
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Surrounding area
Pocket 4 P2Rank #4
0.255
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Surrounding area
Pocket 5 P2Rank #5
0.126
Likely same site as FPocket 12 1.4 Å 8 shared residues 89% of smaller site
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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 #20
0.455
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Surrounding area
Pocket 2 FPocket #24
0.333 Unusual size
Likely same site as P2Rank 2 2.5 Å 15 shared residues 100% of smaller site
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Surrounding area
Pocket 3 FPocket #12
0.216
Likely same site as P2Rank 5 1.4 Å 8 shared residues 89% of smaller site
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Surrounding area
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_A0A0H3GT09
AlphaFold DB — — full sequence — Viewing
ColabFold KP13_01173
ColabFold — — full sequence — Loaded

Cross-references

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

Sequence

UniProt A0A0H3GT09